Introduction to Western Blot Protein Standards

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Overview

en-us LUSP9D7MU Protein Standards Introduction to Western Blot Protein Standards /webroot/web/html/lsr/solutions/technologies/protein_electrophoresis <p>Protein standards are mixtures of well-characterized natural or recombinant proteins that are loaded alongside protein samples in a gel. They are used to help monitor electrophoretic separation as well as estimate the size and concentration of the proteins separated in a gel. This section provides an overview of the different protein standards offered by Bio-Rad, their migration patterns and the range of molecular weight of proteins that can be used alongside these standards.</p> <p><strong>Related Topic:</strong> <a href="/evportal/destination/solutions?catID=LUSOVO47B">Protein Electrophoresis</a>.</p> General Considerations <p>Select protein standards that offer:</p> <ul> <li>Good resolution of the proteins in the size range of interest</li> <li>Compatibility with downstream analysis (for example, blotting)</li> </ul> <p>Protein standards are available as prestained or unstained sets of purified natural or recombinant proteins. Prestained standards allow direct visualization of the proteins' migration during electrophoresis and are useful to assess their subsequent transfer to membranes. Prestained standards can be used for size estimation, however unstained protein standards are recommended for the most accurate size determination.</p> <p>Bio-Rad offers a full range of prestained and unstained standards for various applications. Details of Bio-Rad's protein standards are provided in the tables and figures below.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Applications of Bio-Rad's Protein Standards <p><strong>Applications of Bio-Rad's protein standards.</strong></p> <table class="pd_table" border="0"> <tbody> <tr> <td style="border-top:1px solid #000;">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" colspan="7" align="center"><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1"><strong>Precision Plus Protein&trade;</strong></a></td> <td class="tanbglight" style="border-top:1px solid #000;" colspan="4" align="center"><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a3482104-9cca-44ba-8752-9bc1d262cc67"><strong>Prestained Natural Standards</strong></a></td> </tr> <tr> <td style="border-top:1px solid #000;">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_dual_clr.png" alt="Dual Color" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_kldscp.png" alt="Kaleidoscope" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_dual_xtra.png" alt="Dual Xtra" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_all_blue.png" alt="All Blue" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_wstrnc.png" alt="WesternC" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_unstained.png" alt="Unstained" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_unstained_plugs.png" alt="Unstained Plugs" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_high_range.png" alt="High Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_low_range.png" alt="Low Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_broad_range.png" alt="Broad Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_ntrl_kldscp.png" alt="Natural Kaleidoscope" /></td> </tr> <tr> <td style="border-top:1px solid #000;"><strong>Electrophoresis</strong></td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> </tr> <tr> <td>Accurate MW estimation</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td>Visualize electrophoresis</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Orientation</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Extended MW range</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td>Coomassie staining</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Fluorescent staining</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td style="border-top:1px solid #000;"><strong>Blotting</strong></td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> </tr> <tr> <td>Monitoring transfer efficiency</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Coomassie staining</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Immunodetection</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td style="border-bottom:1px solid #000;">Fluorescent blots*</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> </tr> </tbody> </table> <p class="caption">MW = molecular weight.<br /> * &nbsp;Not to be confused with fluorescent total blot stains. Precision Plus Protein prestained standards contain dyes with fluorescent properties. See <a class="small" href="http://www.bio-rad.com/webroot/web/pdf/lsr/literature/Bulletin_5723.pdf" target="_blank">bulletin 5723</a> for details on using precision Plus Protein WesternC standards for fluorescent multiplexing.<br /> **Precision Plus Protein Standard Plugs are designed specifically for second dimension SDS-PAGE gels in 2-D experiments.</p> <p><strong>Bio-Rad's protein standards for western blotting applications.</strong></p> <p><strong>Recombinant Precision Plus Protein Standards</strong><br /> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_recmbnt_ppp.png" alt="" width="597" height="380" /></p> <p><strong>Natural Standards</strong><br /> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_natural_stndrs.gif" alt="" width="227" height="368" /></p> <p><strong>Protein standards for western blotting applications selection guide.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td valign="bottom"><strong>Protein Standard</strong></td> <td valign="bottom"><strong>Type</strong></td> <td valign="bottom"><strong>Features</strong></td> <td valign="bottom"><strong>Molecular<br /> Weight Range<br /> (on Tris-HCl<br /> or TGX&trade; gels)</strong></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mol_wght.png" alt="Molecular Weight Determination" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mntr_elctr.png" alt="Monitoring Electrophoresis" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mntr_effncy.png" alt="Monitoring Transfer Efficiency" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_chem_dec.png" alt="Chemilumuinescence Detection" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_snglplx.png" alt="Singleplex Fluorescence Detection" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_flrscnc.png" alt="Mulitplex Fluorescence Detection" /></td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=79c16027-4666-47a2-935b-41d87efb8359">SDS-PAGE Unstained Standards (Natural)</a></td> <td>Unstained natural</td> <td>Protein blended to yield uniform band intensities upon staining</td> <td>Broad: 6.5&ndash;200 kD<br /> High: 45&ndash;200 kD<br /> Low: 14.4&ndash;97.4 kD</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=ab429c02-ab15-4967-a7b9-1f78850fc4d3">Precision Plus Protein&trade; Unstained Standards</a></td> <td>Unstained recombinant</td> <td>Integrated <em>Strep</em>-tag for chemiluminescence visualization*</td> <td>10&ndash;250 kD</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1d045ed2-e2d3-4c21-9d1c-a956dbaf6b21">Precision Plus Protein&trade; WesternC&trade; Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent band with integrated <em>Strep</em>-tag for chemiluminescence visualization</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0374">Precision Plus Protein Dual Color Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 2-color band pattern</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0377">Precision Plus Protein Dual Xtra Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 2-color band pattern, extended MW range</td> <td>2&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;productID=161-0375">Precision Plus Protein&trade; Kaleidoscope&trade; Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 5-color band pattern</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&bull;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;productID=161-0373">Precision Plus Protein&trade; All Blue Standards</a></td> <td>Prestained recombinant</td> <td>Prestained fluorescent bands</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?ts=1&amp;cmd=BRCatgProductDetail&amp;vertical=LSR&amp;catID=a3482104-9cca-44ba-8752-9bc1d262cc67">SDS-PAGE Standards (Natural)</a></td> <td>Prestained natural</td> <td>Prestained fluorescent bands</td> <td>Broad: 7.2&ndash;208 kD<br /> High: 47&ndash;205 kD<br /> Low: 19&ndash;107 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?ts=1&amp;cmd=BRCatgProductDetail&amp;vertical=LSR&amp;catID=a3482104-9cca-44ba-8752-9bc1d262cc67">Kaleidoscope Prestained Standards (Natural)</a></td> <td>Prestained natural</td> <td>Prestained multicolored fluorescent bands, multicolored band pattern</td> <td>7.6&ndash;216 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> </tbody> </table> <p class="caption">* For colorimetric or chemiluminescence blot detection, StrepTactin-HRP or -AP conjugate is also needed.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Recombinant Standards <p>Recombinant standards are engineered to display specific attributes such as evenly spaced molecular weights or affinity tags for easy detection on western blots. Bio-Rad's recombinant standards are the <a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1">Precision Plus Protein&trade;</a> standards family of products and are available in stained or unstained formats (see figure below). These standards contain highly purified recombinant proteins with molecular masses of 10&ndash;250 kD (or 2&ndash;250 kD for the Dual Xtra standards).</p> <p><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_img3.gif" alt="Precision Plus Protein standards family of products" /></p> <h4>Precision Plus Protein family of protein standards.</h4> <p><strong>Unstained Standards</strong><br /> Unstained standards contain only purified proteins, so they do not exhibit the variability in molecular weight sometimes observed with prestained standards. Therefore, unstained standards or standards with affinity tags for blot detection deliver high molecular weight recommended for the most accurate molecular weight determinations for gels or blots.</p> <ul> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=ab429c02-ab15-4967-a7b9-1f78850fc4d3"><strong>Precision Plus Protein unstained standards</strong></a> &mdash; include three high-intensity reference bands (25, 50, and 75 kD). These standards offer absolute molecular weight accuracy confirmed by mass spectrometry. Additionally, these standards are compatible with Laemmli and neutral pH buffer systems and are an excellent choice for use with the stain free technology (since they do not contain dye that can interfere with stain-free detection). See <a href="/evportal/destination/solutions?catID=LUSPMPE8Z">Protein Staining</a> for more details.</li> <li>These standards contain an affinity StrepTactin, a genetically modified form of streptavidin. It is the high-affinity binding of the <em>Strep</em>-tag sequence to StrepTactin that allows convenient and simultaneous detection of both proteins and standards on western blots (see figure below) using either colorimetric or chemiluminescence methods.</li> </ul> <p><strong>Overview of the StrepTactin detection system</strong> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_streptactin.gif" alt="Overview of the StrepTactin detection system" /></p> <p><strong>Prestained Standards</strong><br /> The ability to visualize prestained standards during electrophoresis makes them ideal for monitoring protein separation during SDS-PAGE. The proteins are labeled with fluorescent dyes, so can be used in fluorescence detection applications. The prestained markers remain visible on the membrane after transfer, which makes them useful for monitoring transfer efficiency and the general location of antigens in repetitive screening assays (Tsang et al. 1984). Bio-Rad offers both recombinant and natural prestained standards.</p> <ul> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1"><strong>Precision Plus Protein prestained standards</strong></a> (All Blue, Dual Color, and Kaleidoscope&trade;) &mdash; include a proprietary staining technology that provides batch-to-batch molecular mass consistency and reproducible migration. The ability to visualize these standards makes them ideal for monitoring protein separation during gel electrophoresis and monitoring transfer onto blotting membranes.</li> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0377"><strong>Precision Plus Protein Dual Xtra standards</strong></a> &mdash; these prestained standards have additional 2 and 5 kD bands to enable molecular mass estimation below 10 kD.</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1d045ed2-e2d3-4c21-9d1c-a956dbaf6b21"><strong>Precision Plus Protein WesternC standards</strong></a> &mdash; these standards were designed for western blotting applications. Having both unstained and prestained bands enables monitoring of electrophoresis, blot transfer and visualization of the standard after colorimetric or chemiluminescence development (when probed with StrepTactin-HRP or AP conjugate). The WesternC standard will appear directly on a film or CCD image. Additionally this protein standard has fluorescent properties that enable detection of fluorescent blots*</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=0c7564b9-7eec-48d8-b071-068a67e04ce4"><strong>Precision Plus Protein standard plugs</strong></a> &mdash; unstained Precision Plus proteins in a plug for easy loading onto second dimension gels (even those with no reference well).</li> </ul> <p class="caption">*Prestained standards are not recommended for use on gels that will be stained with fluorescent dyes.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Natural Standards <p>Natural standards are blended from naturally occurring proteins. Though effective for monitoring gel separation and transfer efficiency, prestained natural standards have an inherent variability in the amount and location of dye that covalently binds to the protein. This may produce broader bands than seen with recombinant standards, making them less desirable for molecular weight estimations.</p> <p>Bio-Rad offers the following prestained and unstained natural standards:</p> <ul> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0324"><strong>Kaleidoscope standards</strong></a> &mdash; individually colored proteins to allow instant orientation on gels and blots</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a3482104-9cca-44ba-8752-9bc1d262cc67"><strong>Prestained SDS-PAGE standards</strong></a> &mdash; blue colored standards available in low, high, and broad ranges</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=79c16027-4666-47a2-935b-41d87efb8359"><strong>Unstained SDS-PAGE standards</strong></a> &mdash; available in low, high, and broad ranges, these standards are blended to give uniform band intensities when stained with Coomassie Brilliant Blue R-250 or zinc stains. These standards can also be used for silver staining applications</li> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0325"><strong>Polypeptide SDS-PAGE standards</strong></a> &mdash; for molecular weight determination of peptides and small proteins resolved on Tris-Tricine gels</li> </ul> <p><img src="http://www.bio-rad.com/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_img5.jpg" alt="" width="536" height="299" /></p> <p class="caption">* Can also be used with other staining applications such as silver staining.</p> <p class="caption"><strong>Bio-Rad's natural protein standards.</strong></p> <div class="top"><a href="#helptop">Back to Top</a></div> References <p>Tsang VC et al. (1984). Calibration of prestained protein molecular weight standards for use in the "Western" or enzyme-linked immunoelectrotransfer blot techniques. Anal Biochem 143, 304&ndash;307.</p> <div class="top"><a href="#helptop">Back to Top</a></div> 2414 The Little Book of Standards, Rev D 2414 /webroot/web/pdf/lsr/literature/Bulletin_2414.pdf Literature PDF Other /webroot/web/images/general/icons/icon_pdf.gif No The Little Book of Standards, Rev D 2414 protein standard, LIT2414, bulletin 2414 2998 Protein Standards Application Guide, Rev G 2998 H /webroot/web/pdf/lsr/literature/Bulletin_2998.pdf Literature PDF Manuals_and_Quick_Guides /webroot/web/images/general/icons/icon_pdf.gif Protein Standards Application Guide, Rev G No Protein Standards Application Guide, Rev G 2998 2998, Precision Plus Protein, Prestained and Unstained Natural, Specialty Standards, WesternC, Kaleidoscope, Dual Xtra, Dual Color, All Blue, broad, low, and high Range, polypeptide, IEF, 2-D, standard plugs, electrophoresis, SDS-PAGE, accurate MW estimation, multicolored, Coomassie and fluorescent staining, monitoring transfer efficiency, blotting, immunodetection, chemiluminescent, 161-0385, 1610385, 161-0398, 1610398, 161-0375, 1610375, 161-0395, 1610395, 161-0377, 1610377, 161-0397, 1610397, 161-0374, 1610374, 161-0394, 1610394, 161-0373, 1610373, 161-0393, 1610393, 161-0363, 1610363, 161-0396, 1610396, 161-0318, 1610318, 161-0305, 1610305, 161-0309, 1610309, 161-0324, 1610324, 161-0317, 1610317, 161-0304, 1610304, 161-0303, 1610303, 161-0326, 1610326, 161-0310, 1610310, 161-0320, 1610320, 161-0378, 1610378 5956 Precision Plus Protein Dual Xtra Standards — New Protein Standards with an Extended Range from 2 to 250 kD, Rev B 5956 H /webroot/web/pdf/lsr/literature/Bulletin_5956.pdf Literature PDF Application_Notes /webroot/web/images/icon_pdf.gif No Precision Plus Protein Dual Xtra Standards — New Protein Standards with an Extended Range from 2 to 250 kD, Rev B 5956 5956, precision, precision plus, dual extra, dual xtra, dual, duel, protein marker, protein markers, protein standard, protein standards, prestained, wide-range, wide range, 161-0377, 161-0397, 1610377, 1610397 5792 The Dynamic Range Effect on Protein Quantitation in Polyacrylamide Gels and on Western Blots, Rev A 5792 /webroot/web/pdf/lsr/literature/Bulletin_5792A.pdf Literature PDF Application_Notes /webroot/web/images/general/icons/icon_pdf.gif No The Dynamic Range Effect on Protein Quantitation in Polyacrylamide Gels and on Western Blots, Rev A 5792 LIT5792, fluorescence, fluorescent, Bulletin 5792, mAb, Quantity One 1-D analysis software, secondary antibodies, blotting, fluorophore, 1708071, low-abundance, Molecular Imager ChemiDoc XRS system, monoclonal antibody conjugates, 170-8071, blot, GS-800 calibrated densitometer, low abundance proteins, Qdot, Qdots, 170-8070, fluorophores, multifluorescent signal detection, SDS-PAGE, 1708070, imaging, multifluorescence 2847 <i>Strep</i>-tag Technology for Molecular Weight (MW) Determinations on Blots Using Precision Plus Protein Standards, Rev B 2847 /webroot/web/pdf/lsr/literature/Bulletin_2847.pdf Literature PDF Application_Notes /webroot/web/images/general/icons/icon_pdf.gif No <i>Strep</i>-tag Technology for Molecular Weight (MW) Determinations on Blots Using Precision Plus Protein Standards, Rev B 2847 LIT2847, bulletin 2847, blotting, westerns 5576 Molecular Weight Estimation and Quantitation of Protein Samples Using Precision Plus Protein WesternC Standards, the Immun-Star WesternC Chemiluminescent Detection Kit, and the Molecular Imager ChemiDoc XRS Imaging System, Rev C 5576 /webroot/web/pdf/lsr/literature/Bulletin_5576C.pdf Literature PDF Application_Notes /webroot/web/images/general/icons/icon_pdf.gif No Molecular Weight Estimation and Quantitation of Protein Samples Using Precision Plus Protein WesternC Standards, the Immun-Star WesternC Chemiluminescent Detection Kit, and the Molecular Imager ChemiDoc XRS Imaging System, Rev C 5576 170-5070, band visualization, blotter, Quantity-One, recombinant markers, 1708071, densitometry quantification, 170-8071, blot, pre-stained, Strep tag sequence, StrepTactin, 161-0376, chemiluminescence, immuno-detection, immunoblotting, Quantity-1, 1708070, blots, charge coupled device, charge-coupled, horseradish peroxidase, LIT5576, Sodium dodecyl sulfate polyacrylamide gel electrophoresis, western blotting, 1610376, digital CCD-based, Quantity 1, Strep-tag, 170-8070, 1705070, immunodetection, nitrocellulose membranes, Polyvinylidene fluoride, prestained, PVDF membrane, quantitate, SDS-PAGE, StrepTactin-HRP conjugate, immuno-blotting, Quantity One 5763 Molecular Weight Estimation Using Precision Plus Protein™ WesternC™ Standards on Criterion™ Tris-HCl and Criterion XT Bis-Tris Gels, Rev B 5763 /webroot/web/pdf/lsr/literature/Bulletin_5763.pdf Literature PDF Application_Notes /webroot/web/images/general/icons/icon_pdf.gif No Molecular Weight Estimation Using Precision Plus Protein WesternC Standards on Criterion Tris-HCl and Criterion XT Bis-Tris Gels, Rev B 5763 western blotting, precast, sds-page, tag, 161-0385, lit5763, strep, strep-tag, tagged protein, molecular weight estimation, page, bulletin 5763, 161-0376, one-dimensional gel electrophoresis, 176-2450, 345-0111, 345-0111J10, 345-0111J4, 345-0112, 345-0112J10, 345-0112J4, 345-0113, 345-0113J10, 345-0113J4, 345-0115, 345-0115J10, 345-0117, 345-0117J10, 345-0117J4, 345-0118, 345-0118J10, 345-0118J4, 345-0118XTU, 345-0119, 345-0119J10, 345-0119J4, 345-0120, 345-0121, 345-0121EDU, 345-0121J10, 345-0121J4, 345-0123, 345-0123EDU, 345-0123J10, 345-0124, 345-0124J10, 345-0124J4, 345-0125, 345-0125J10, 345-0125J4, 345-0126, 345-0127, 345-0127EDU, 345-0127J10, 345-0127J4, 345-0129, 345-0130, 345-0131, 345-0133, 345-0135, 345-0136, 345-0137, 1610385, 1762450, 3450111, 3450111J10, 3450111J4, 3450112, 3450112J10, 3450112J4, 3450113, 3450113J10, 3450113J4, 3450115, 3450115J10, 3450117, 3450117J10, 3450117J4, 3450118, 3450118J10, 3450118J4, 3450118XTU, 3450119, 3450119J10, 3450119J4, 3450120, 3450121, 3450121EDU, 3450121J10, 3450121J4, 3450123, 3450123EDU, 3450123J10, 3450124, 3450124J10, 3450124J4, 3450125, 3450125J10, 3450125J4, 3450126, 3450127, 3450127EDU, 3450127J10, 3450127J4, 3450129, 3450130, 3450131, 3450133, 3450135, 3450136, 3450137 Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Midi Format 1D-Electrophoresis Systems/Criterion Cell Systems ->MT::b94e30f5-0f2a-452d-a3a0-825e8205b476##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Mini Format 1D-Electrophoresis Systems/Mini-PROTEAN Tetra Cell Systems ->MT::5cf78e19-7ed5-4373-a988-3e62456a488e##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Large Format 1D-Electrophoresis Systems/PROTEAN II xi Cells ->MT::030e1125-d5c2-4f5a-8d9f-a004d783b845##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Protein Stains/Fluorescent Stains ->MT::cb886820-1f6e-447f-8ef6-772fd81c29e3##Life Science Research/Products/Imaging Instruments &amp; Bioinformatics/Molecular Imager Systems/Gel Doc EZ Systems ->MTS::L7BL4S15## ->MTS::LUSPPAKG4## ->MTS::LUSQG6LPT## Life Science Research/Solutions/Applications/Protein Separation and Analysis ->MTS::LUSOU3F7Q##Life Science Research/Solutions/Applications/2-D Electrophoresis and Analysis ->MTS::LUSQF04EH##Life Science Research/Solutions/Applications/Automated Electrophoresis and Analysis ->MTS::LUSQXB15##Life Science Research/Solutions/Technologies/Automated Electrophoresis System -Experion- ->MTS::LUSR04KG4## Eddie C Intro to Western Blot Protein Standards 12/19/11 10:03 AM 12/19/21 10:08 AM AE,AI,AL,AM,AR,AT,AU,AZ,BA,BD,BE,BF,BG,BH,BN,BO,BR,BW,CA,CH,CL,CM,CN,CO,CR,CY,CZ,DE,DK,DO,DZ,EC,EE,EG,EH,ER,ES,ET,FI,FM,FO,FR,GA,GE,GF,GH,GP,GR,GT,GU,HK,HN,HR,HT,HU,ID,IE,IL,IN,IS,IT,JM,JO,JP,KE,KH,KR,KW,KZ,LB,LI,LK,LT,LU,LV,MA,MD,MG,MK,ML,MO,MQ,MS,MT,MU,MX,MY,NG,NI,NL,NO,NP,NZ,OM,PA,PE,PF,PG,PH,PK,PL,PR,PS,PT,PW,PY,QA,RO,RS,RU,SA,SB,SE,SG,SI,SK,SN,ST,SV,TG,TH,TN,TO,TR,TT,TW,TZ,UA,UG,UK,US,UY,UZ,VA,VE,VU,XK,YE,ZA en LSR /LSR/Technologies/Protein_Electrophoresis N 0 Protein Electrophoresis Reagent Selection and Preparation /en-us/applications-technologies/applications-technologies/introduction-western-blot-protein-standards?ID=LUSP8GD57

Protein standards are mixtures of well-characterized natural or recombinant proteins that are loaded alongside protein samples in a gel. They are used to help monitor electrophoretic separation as well as estimate the size and concentration of the proteins separated in a gel. This section provides an overview of the different protein standards offered by Bio-Rad, their migration patterns and the range of molecular weight of proteins that can be used alongside these standards.

Related Topic: Protein Electrophoresis.

 

General Considerations

Select protein standards that offer:

  • Good resolution of the proteins in the size range of interest
  • Compatibility with downstream analysis (for example, blotting)

Protein standards are available as prestained or unstained sets of purified natural or recombinant proteins. Prestained standards allow direct visualization of the proteins' migration during electrophoresis and are useful to assess their subsequent transfer to membranes. Prestained standards can be used for size estimation, however unstained protein standards are recommended for the most accurate size determination.

Bio-Rad offers a full range of prestained and unstained standards for various applications. Details of Bio-Rad's protein standards are provided in the tables and figures below.

 

Applications of Bio-Rad's Protein Standards

Applications of Bio-Rad's protein standards.

  Precision Plus Protein™ Prestained Natural Standards
  Dual Color Kaleidoscope Dual Xtra All Blue WesternC Unstained Unstained Plugs High Range Low Range Broad Range Natural Kaleidoscope
Electrophoresis                      
Accurate MW estimation
Visualize electrophoresis
Orientation
Extended MW range
Coomassie staining
Fluorescent staining
Blotting                      
Monitoring transfer efficiency
Coomassie staining
Immunodetection
Fluorescent blots*

MW = molecular weight.
*  Not to be confused with fluorescent total blot stains. Precision Plus Protein prestained standards contain dyes with fluorescent properties. See bulletin 5723 for details on using precision Plus Protein WesternC standards for fluorescent multiplexing.
**Precision Plus Protein Standard Plugs are designed specifically for second dimension SDS-PAGE gels in 2-D experiments.

Bio-Rad's protein standards for western blotting applications.

Recombinant Precision Plus Protein Standards

Natural Standards

Protein standards for western blotting applications selection guide.

Protein Standard Type Features Molecular
Weight Range
(on Tris-HCl
or TGX™ gels)
Molecular Weight Determination Monitoring Electrophoresis Monitoring Transfer Efficiency Chemilumuinescence Detection Singleplex Fluorescence Detection Mulitplex Fluorescence Detection
SDS-PAGE Unstained Standards (Natural) Unstained natural Protein blended to yield uniform band intensities upon staining Broad: 6.5–200 kD
High: 45–200 kD
Low: 14.4–97.4 kD
         
Precision Plus Protein™ Unstained Standards Unstained recombinant Integrated Strep-tag for chemiluminescence visualization* 10–250 kD        
Precision Plus Protein™ WesternC™ Standards Prestained recombinant Prestained multicolored fluorescent band with integrated Strep-tag for chemiluminescence visualization 10–250 kD  
Precision Plus Protein Dual Color Standards Prestained recombinant Prestained multicolored fluorescent bands, 2-color band pattern 10–250 kD    
Precision Plus Protein Dual Xtra Standards Prestained recombinant Prestained multicolored fluorescent bands, 2-color band pattern, extended MW range 2–250 kD    
Precision Plus Protein™ Kaleidoscope™ Standards Prestained recombinant Prestained multicolored fluorescent bands, 5-color band pattern 10–250 kD      
Precision Plus Protein™ All Blue Standards Prestained recombinant Prestained fluorescent bands 10–250 kD      
SDS-PAGE Standards (Natural) Prestained natural Prestained fluorescent bands Broad: 7.2–208 kD
High: 47–205 kD
Low: 19–107 kD
       
Kaleidoscope Prestained Standards (Natural) Prestained natural Prestained multicolored fluorescent bands, multicolored band pattern 7.6–216 kD        

* For colorimetric or chemiluminescence blot detection, StrepTactin-HRP or -AP conjugate is also needed.

 

Recombinant Standards

Recombinant standards are engineered to display specific attributes such as evenly spaced molecular weights or affinity tags for easy detection on western blots. Bio-Rad's recombinant standards are the Precision Plus Protein™ standards family of products and are available in stained or unstained formats (see figure below). These standards contain highly purified recombinant proteins with molecular masses of 10–250 kD (or 2–250 kD for the Dual Xtra standards).

Precision Plus Protein standards family of products

Precision Plus Protein family of protein standards.

Unstained Standards
Unstained standards contain only purified proteins, so they do not exhibit the variability in molecular weight sometimes observed with prestained standards. Therefore, unstained standards or standards with affinity tags for blot detection deliver high molecular weight recommended for the most accurate molecular weight determinations for gels or blots.

  • Precision Plus Protein unstained standards — include three high-intensity reference bands (25, 50, and 75 kD). These standards offer absolute molecular weight accuracy confirmed by mass spectrometry. Additionally, these standards are compatible with Laemmli and neutral pH buffer systems and are an excellent choice for use with the stain free technology (since they do not contain dye that can interfere with stain-free detection). See Protein Staining for more details.
  • These standards contain an affinity StrepTactin, a genetically modified form of streptavidin. It is the high-affinity binding of the Strep-tag sequence to StrepTactin that allows convenient and simultaneous detection of both proteins and standards on western blots (see figure below) using either colorimetric or chemiluminescence methods.

Overview of the StrepTactin detection system Overview of the  StrepTactin detection system

Prestained Standards
The ability to visualize prestained standards during electrophoresis makes them ideal for monitoring protein separation during SDS-PAGE. The proteins are labeled with fluorescent dyes, so can be used in fluorescence detection applications. The prestained markers remain visible on the membrane after transfer, which makes them useful for monitoring transfer efficiency and the general location of antigens in repetitive screening assays (Tsang et al. 1984). Bio-Rad offers both recombinant and natural prestained standards.

  • Precision Plus Protein prestained standards (All Blue, Dual Color, and Kaleidoscope™) — include a proprietary staining technology that provides batch-to-batch molecular mass consistency and reproducible migration. The ability to visualize these standards makes them ideal for monitoring protein separation during gel electrophoresis and monitoring transfer onto blotting membranes.
  • Precision Plus Protein Dual Xtra standards — these prestained standards have additional 2 and 5 kD bands to enable molecular mass estimation below 10 kD.
  • Precision Plus Protein WesternC standards — these standards were designed for western blotting applications. Having both unstained and prestained bands enables monitoring of electrophoresis, blot transfer and visualization of the standard after colorimetric or chemiluminescence development (when probed with StrepTactin-HRP or AP conjugate). The WesternC standard will appear directly on a film or CCD image. Additionally this protein standard has fluorescent properties that enable detection of fluorescent blots*
  • Precision Plus Protein standard plugs — unstained Precision Plus proteins in a plug for easy loading onto second dimension gels (even those with no reference well).

*Prestained standards are not recommended for use on gels that will be stained with fluorescent dyes.

 

Natural Standards

Natural standards are blended from naturally occurring proteins. Though effective for monitoring gel separation and transfer efficiency, prestained natural standards have an inherent variability in the amount and location of dye that covalently binds to the protein. This may produce broader bands than seen with recombinant standards, making them less desirable for molecular weight estimations.

Bio-Rad offers the following prestained and unstained natural standards:

  • Kaleidoscope standards — individually colored proteins to allow instant orientation on gels and blots
  • Prestained SDS-PAGE standards — blue colored standards available in low, high, and broad ranges
  • Unstained SDS-PAGE standards — available in low, high, and broad ranges, these standards are blended to give uniform band intensities when stained with Coomassie Brilliant Blue R-250 or zinc stains. These standards can also be used for silver staining applications
  • Polypeptide SDS-PAGE standards — for molecular weight determination of peptides and small proteins resolved on Tris-Tricine gels

* Can also be used with other staining applications such as silver staining.

Bio-Rad's natural protein standards.

 

References

Tsang VC et al. (1984). Calibration of prestained protein molecular weight standards for use in the "Western" or enzyme-linked immunoelectrotransfer blot techniques. Anal Biochem 143, 304–307.

 

Related Content

 
Literature
Number Description Download
2414 The Little Book of Standards, Rev D Click to download
2998 Protein Standards Application Guide, Rev G Click to download
5956 Precision Plus Protein Dual Xtra Standards — New Protein Standards with an Extended Range from 2 to 250 kD, Rev B Click to download
5792 The Dynamic Range Effect on Protein Quantitation in Polyacrylamide Gels and on Western Blots, Rev A Click to download
2847 <i>Strep</i>-tag Technology for Molecular Weight (MW) Determinations on Blots Using Precision Plus Protein Standards, Rev B Click to download
5576 Molecular Weight Estimation and Quantitation of Protein Samples Using Precision Plus Protein WesternC Standards, the Immun-Star WesternC Chemiluminescent Detection Kit, and the Molecular Imager ChemiDoc XRS Imaging System, Rev C Click to download
5763 Molecular Weight Estimation Using Precision Plus Protein™ WesternC™ Standards on Criterion™ Tris-HCl and Criterion XT Bis-Tris Gels, Rev B Click to download
 
 
LUSP9D7MU [x-forwarded-proto] = [http] [x-forwarded-port] = [80] [x-forwarded-for] = [66.249.75.25, 10.232.2.107] [accept] = [text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8] [if-modified-since] = [Thu, 16 Aug 2018 07:32:43 GMT] [seourl] = [/en-us/applications-technologies/introduction-western-blot-protein-standards] [x-amzn-trace-id] = [Root=1-5b753bee-d7fbbd5870b88d8b33f131b0] [x-forwarded-server] = [lsds-prod-s.br.aws-livesite.io] [x-forwarded-host] = [www.bio-rad.com] [x-query-string] = [ID=LUSP9D7MU] [host] = [10.232.0.21:1776] [x-request-uri] = [/en-us/applications-technologies/introduction-western-blot-protein-standards] [from] = [googlebot(at)googlebot.com] [connection] = [Keep-Alive] [accept-encoding] = [gzip,deflate,br] [user-agent] = [Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)] AppTech/AppTechDetails pageStyleKey internet/solutions_sub applications-technologies/introduction-western-blot-protein-standards LSR LUSP9D7MU Protein Standards Introduction to Western Blot Protein Standards /webroot/web/html/lsr/solutions/technologies/protein_electrophoresis <p>Protein standards are mixtures of well-characterized natural or recombinant proteins that are loaded alongside protein samples in a gel. They are used to help monitor electrophoretic separation as well as estimate the size and concentration of the proteins separated in a gel. This section provides an overview of the different protein standards offered by Bio-Rad, their migration patterns and the range of molecular weight of proteins that can be used alongside these standards.</p> <p><strong>Related Topic:</strong> <a href="/evportal/destination/solutions?catID=LUSOVO47B">Protein Electrophoresis</a>.</p> General Considerations <p>Select protein standards that offer:</p> <ul> <li>Good resolution of the proteins in the size range of interest</li> <li>Compatibility with downstream analysis (for example, blotting)</li> </ul> <p>Protein standards are available as prestained or unstained sets of purified natural or recombinant proteins. Prestained standards allow direct visualization of the proteins' migration during electrophoresis and are useful to assess their subsequent transfer to membranes. Prestained standards can be used for size estimation, however unstained protein standards are recommended for the most accurate size determination.</p> <p>Bio-Rad offers a full range of prestained and unstained standards for various applications. Details of Bio-Rad's protein standards are provided in the tables and figures below.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Applications of Bio-Rad's Protein Standards <p><strong>Applications of Bio-Rad's protein standards.</strong></p> <table class="pd_table" border="0"> <tbody> <tr> <td style="border-top:1px solid #000;">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" colspan="7" align="center"><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1"><strong>Precision Plus Protein&trade;</strong></a></td> <td class="tanbglight" style="border-top:1px solid #000;" colspan="4" align="center"><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a3482104-9cca-44ba-8752-9bc1d262cc67"><strong>Prestained Natural Standards</strong></a></td> </tr> <tr> <td style="border-top:1px solid #000;">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_dual_clr.png" alt="Dual Color" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_kldscp.png" alt="Kaleidoscope" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_dual_xtra.png" alt="Dual Xtra" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_all_blue.png" alt="All Blue" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_wstrnc.png" alt="WesternC" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_unstained.png" alt="Unstained" /></td> <td class="tanbg" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_unstained_plugs.png" alt="Unstained Plugs" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_high_range.png" alt="High Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_low_range.png" alt="Low Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_broad_range.png" alt="Broad Range" /></td> <td class="tanbglight" style="border-top:1px solid #000;" align="center"><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_table_hdr_ntrl_kldscp.png" alt="Natural Kaleidoscope" /></td> </tr> <tr> <td style="border-top:1px solid #000;"><strong>Electrophoresis</strong></td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> </tr> <tr> <td>Accurate MW estimation</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td>Visualize electrophoresis</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Orientation</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Extended MW range</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td>Coomassie staining</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Fluorescent staining</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td style="border-top:1px solid #000;"><strong>Blotting</strong></td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbg" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> <td class="tanbglight" style="border-top:1px solid #000;" align="center">&nbsp;</td> </tr> <tr> <td>Monitoring transfer efficiency</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Coomassie staining</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> <td class="tanbglight" align="center">&bull;</td> </tr> <tr> <td>Immunodetection</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&mdash;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbg" align="center">&bull;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> <td class="tanbglight" align="center">&mdash;</td> </tr> <tr> <td style="border-bottom:1px solid #000;">Fluorescent blots*</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&bull;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbg" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> <td class="tanbglight" style="border-bottom:1px solid #000;" align="center">&mdash;</td> </tr> </tbody> </table> <p class="caption">MW = molecular weight.<br /> * &nbsp;Not to be confused with fluorescent total blot stains. Precision Plus Protein prestained standards contain dyes with fluorescent properties. See <a class="small" href="http://www.bio-rad.com/webroot/web/pdf/lsr/literature/Bulletin_5723.pdf" target="_blank">bulletin 5723</a> for details on using precision Plus Protein WesternC standards for fluorescent multiplexing.<br /> **Precision Plus Protein Standard Plugs are designed specifically for second dimension SDS-PAGE gels in 2-D experiments.</p> <p><strong>Bio-Rad's protein standards for western blotting applications.</strong></p> <p><strong>Recombinant Precision Plus Protein Standards</strong><br /> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_recmbnt_ppp.png" alt="" width="597" height="380" /></p> <p><strong>Natural Standards</strong><br /> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_natural_stndrs.gif" alt="" width="227" height="368" /></p> <p><strong>Protein standards for western blotting applications selection guide.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td valign="bottom"><strong>Protein Standard</strong></td> <td valign="bottom"><strong>Type</strong></td> <td valign="bottom"><strong>Features</strong></td> <td valign="bottom"><strong>Molecular<br /> Weight Range<br /> (on Tris-HCl<br /> or TGX&trade; gels)</strong></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mol_wght.png" alt="Molecular Weight Determination" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mntr_elctr.png" alt="Monitoring Electrophoresis" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_mntr_effncy.png" alt="Monitoring Transfer Efficiency" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_chem_dec.png" alt="Chemilumuinescence Detection" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_snglplx.png" alt="Singleplex Fluorescence Detection" /></td> <td><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_tbl2hdr_flrscnc.png" alt="Mulitplex Fluorescence Detection" /></td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=79c16027-4666-47a2-935b-41d87efb8359">SDS-PAGE Unstained Standards (Natural)</a></td> <td>Unstained natural</td> <td>Protein blended to yield uniform band intensities upon staining</td> <td>Broad: 6.5&ndash;200 kD<br /> High: 45&ndash;200 kD<br /> Low: 14.4&ndash;97.4 kD</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=ab429c02-ab15-4967-a7b9-1f78850fc4d3">Precision Plus Protein&trade; Unstained Standards</a></td> <td>Unstained recombinant</td> <td>Integrated <em>Strep</em>-tag for chemiluminescence visualization*</td> <td>10&ndash;250 kD</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1d045ed2-e2d3-4c21-9d1c-a956dbaf6b21">Precision Plus Protein&trade; WesternC&trade; Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent band with integrated <em>Strep</em>-tag for chemiluminescence visualization</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0374">Precision Plus Protein Dual Color Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 2-color band pattern</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0377">Precision Plus Protein Dual Xtra Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 2-color band pattern, extended MW range</td> <td>2&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;productID=161-0375">Precision Plus Protein&trade; Kaleidoscope&trade; Standards</a></td> <td>Prestained recombinant</td> <td>Prestained multicolored fluorescent bands, 5-color band pattern</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&bull;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;productID=161-0373">Precision Plus Protein&trade; All Blue Standards</a></td> <td>Prestained recombinant</td> <td>Prestained fluorescent bands</td> <td>10&ndash;250 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> </tr> <tr> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?ts=1&amp;cmd=BRCatgProductDetail&amp;vertical=LSR&amp;catID=a3482104-9cca-44ba-8752-9bc1d262cc67">SDS-PAGE Standards (Natural)</a></td> <td>Prestained natural</td> <td>Prestained fluorescent bands</td> <td>Broad: 7.2&ndash;208 kD<br /> High: 47&ndash;205 kD<br /> Low: 19&ndash;107 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&nbsp;</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> </tr> <tr class="pd_colorbackground"> <td><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?ts=1&amp;cmd=BRCatgProductDetail&amp;vertical=LSR&amp;catID=a3482104-9cca-44ba-8752-9bc1d262cc67">Kaleidoscope Prestained Standards (Natural)</a></td> <td>Prestained natural</td> <td>Prestained multicolored fluorescent bands, multicolored band pattern</td> <td>7.6&ndash;216 kD</td> <td>&nbsp;</td> <td class="pd_centeredcell">&bull;</td> <td class="pd_centeredcell">&bull;</td> <td>&nbsp;</td> <td>&nbsp;</td> <td>&nbsp;</td> </tr> </tbody> </table> <p class="caption">* For colorimetric or chemiluminescence blot detection, StrepTactin-HRP or -AP conjugate is also needed.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Recombinant Standards <p>Recombinant standards are engineered to display specific attributes such as evenly spaced molecular weights or affinity tags for easy detection on western blots. Bio-Rad's recombinant standards are the <a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1">Precision Plus Protein&trade;</a> standards family of products and are available in stained or unstained formats (see figure below). These standards contain highly purified recombinant proteins with molecular masses of 10&ndash;250 kD (or 2&ndash;250 kD for the Dual Xtra standards).</p> <p><img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_img3.gif" alt="Precision Plus Protein standards family of products" /></p> <h4>Precision Plus Protein family of protein standards.</h4> <p><strong>Unstained Standards</strong><br /> Unstained standards contain only purified proteins, so they do not exhibit the variability in molecular weight sometimes observed with prestained standards. Therefore, unstained standards or standards with affinity tags for blot detection deliver high molecular weight recommended for the most accurate molecular weight determinations for gels or blots.</p> <ul> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=ab429c02-ab15-4967-a7b9-1f78850fc4d3"><strong>Precision Plus Protein unstained standards</strong></a> &mdash; include three high-intensity reference bands (25, 50, and 75 kD). These standards offer absolute molecular weight accuracy confirmed by mass spectrometry. Additionally, these standards are compatible with Laemmli and neutral pH buffer systems and are an excellent choice for use with the stain free technology (since they do not contain dye that can interfere with stain-free detection). See <a href="/evportal/destination/solutions?catID=LUSPMPE8Z">Protein Staining</a> for more details.</li> <li>These standards contain an affinity StrepTactin, a genetically modified form of streptavidin. It is the high-affinity binding of the <em>Strep</em>-tag sequence to StrepTactin that allows convenient and simultaneous detection of both proteins and standards on western blots (see figure below) using either colorimetric or chemiluminescence methods.</li> </ul> <p><strong>Overview of the StrepTactin detection system</strong> <img src="/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_streptactin.gif" alt="Overview of the StrepTactin detection system" /></p> <p><strong>Prestained Standards</strong><br /> The ability to visualize prestained standards during electrophoresis makes them ideal for monitoring protein separation during SDS-PAGE. The proteins are labeled with fluorescent dyes, so can be used in fluorescence detection applications. The prestained markers remain visible on the membrane after transfer, which makes them useful for monitoring transfer efficiency and the general location of antigens in repetitive screening assays (Tsang et al. 1984). Bio-Rad offers both recombinant and natural prestained standards.</p> <ul> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a7b0f9ce-e080-4b51-ab99-4cded66497c1"><strong>Precision Plus Protein prestained standards</strong></a> (All Blue, Dual Color, and Kaleidoscope&trade;) &mdash; include a proprietary staining technology that provides batch-to-batch molecular mass consistency and reproducible migration. The ability to visualize these standards makes them ideal for monitoring protein separation during gel electrophoresis and monitoring transfer onto blotting membranes.</li> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0377"><strong>Precision Plus Protein Dual Xtra standards</strong></a> &mdash; these prestained standards have additional 2 and 5 kD bands to enable molecular mass estimation below 10 kD.</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1d045ed2-e2d3-4c21-9d1c-a956dbaf6b21"><strong>Precision Plus Protein WesternC standards</strong></a> &mdash; these standards were designed for western blotting applications. Having both unstained and prestained bands enables monitoring of electrophoresis, blot transfer and visualization of the standard after colorimetric or chemiluminescence development (when probed with StrepTactin-HRP or AP conjugate). The WesternC standard will appear directly on a film or CCD image. Additionally this protein standard has fluorescent properties that enable detection of fluorescent blots*</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=0c7564b9-7eec-48d8-b071-068a67e04ce4"><strong>Precision Plus Protein standard plugs</strong></a> &mdash; unstained Precision Plus proteins in a plug for easy loading onto second dimension gels (even those with no reference well).</li> </ul> <p class="caption">*Prestained standards are not recommended for use on gels that will be stained with fluorescent dyes.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Natural Standards <p>Natural standards are blended from naturally occurring proteins. Though effective for monitoring gel separation and transfer efficiency, prestained natural standards have an inherent variability in the amount and location of dye that covalently binds to the protein. This may produce broader bands than seen with recombinant standards, making them less desirable for molecular weight estimations.</p> <p>Bio-Rad offers the following prestained and unstained natural standards:</p> <ul> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0324"><strong>Kaleidoscope standards</strong></a> &mdash; individually colored proteins to allow instant orientation on gels and blots</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=a3482104-9cca-44ba-8752-9bc1d262cc67"><strong>Prestained SDS-PAGE standards</strong></a> &mdash; blue colored standards available in low, high, and broad ranges</li> <li><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=79c16027-4666-47a2-935b-41d87efb8359"><strong>Unstained SDS-PAGE standards</strong></a> &mdash; available in low, high, and broad ranges, these standards are blended to give uniform band intensities when stained with Coomassie Brilliant Blue R-250 or zinc stains. These standards can also be used for silver staining applications</li> <li><a href="http://www.bio-rad.com/prd/en/US/adirect/biorad?cmd=catProductDetail&amp;vertical=LSR&amp;country=US&amp;lang=en&amp;productID=161-0325"><strong>Polypeptide SDS-PAGE standards</strong></a> &mdash; for molecular weight determination of peptides and small proteins resolved on Tris-Tricine gels</li> </ul> <p><img src="http://www.bio-rad.com/webroot/web/images/lsr/solutions/technologies/protein_electrophoresis_blotting_and_imaging/protein_electrophoresis/technology_detail/pet141_img5.jpg" alt="" width="536" height="299" /></p> <p class="caption">* Can also be used with other staining applications such as silver staining.</p> <p class="caption"><strong>Bio-Rad's natural protein standards.</strong></p> <div class="top"><a href="#helptop">Back to Top</a></div> References <p>Tsang VC et al. (1984). Calibration of prestained protein molecular weight standards for use in the "Western" or enzyme-linked immunoelectrotransfer blot techniques. Anal Biochem 143, 304&ndash;307.</p> <div class="top"><a href="#helptop">Back to Top</a></div> 2414 2998 5956 5792 2847 5576 5763 Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Midi Format 1D-Electrophoresis Systems/Criterion Cell Systems ->MT::b94e30f5-0f2a-452d-a3a0-825e8205b476##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Mini Format 1D-Electrophoresis Systems/Mini-PROTEAN Tetra Cell Systems ->MT::5cf78e19-7ed5-4373-a988-3e62456a488e##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Large Format 1D-Electrophoresis Systems/PROTEAN II xi Cells ->MT::030e1125-d5c2-4f5a-8d9f-a004d783b845##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Protein Stains/Fluorescent Stains ->MT::cb886820-1f6e-447f-8ef6-772fd81c29e3##Life Science Research/Products/Imaging Instruments &amp; Bioinformatics/Molecular Imager Systems/Gel Doc EZ Systems ->MTS::L7BL4S15## ->MTS::LUSPPAKG4## ->MTS::LUSQG6LPT## Life Science Research/Solutions/Applications/Protein Separation and Analysis ->MTS::LUSOU3F7Q##Life Science Research/Solutions/Applications/2-D Electrophoresis and Analysis ->MTS::LUSQF04EH##Life Science Research/Solutions/Applications/Automated Electrophoresis and Analysis ->MTS::LUSQXB15##Life Science Research/Solutions/Technologies/Automated Electrophoresis System -Experion- ->MTS::LUSR04KG4## Eddie C Intro to Western Blot Protein Standards 12/19/11 10:03 AM 12/19/21 10:08 AM AE,AI,AL,AM,AR,AT,AU,AZ,BA,BD,BE,BF,BG,BH,BN,BO,BR,BW,CA,CH,CL,CM,CN,CO,CR,CY,CZ,DE,DK,DO,DZ,EC,EE,EG,EH,ER,ES,ET,FI,FM,FO,FR,GA,GE,GF,GH,GP,GR,GT,GU,HK,HN,HR,HT,HU,ID,IE,IL,IN,IS,IT,JM,JO,JP,KE,KH,KR,KW,KZ,LB,LI,LK,LT,LU,LV,MA,MD,MG,MK,ML,MO,MQ,MS,MT,MU,MX,MY,NG,NI,NL,NO,NP,NZ,OM,PA,PE,PF,PG,PH,PK,PL,PR,PS,PT,PW,PY,QA,RO,RS,RU,SA,SB,SE,SG,SI,SK,SN,ST,SV,TG,TH,TN,TO,TR,TT,TW,TZ,UA,UG,UK,US,UY,UZ,VA,VE,VU,XK,YE,ZA en LSR /LSR/Technologies/Protein_Electrophoresis N 0
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