Blotting Membranes and Papers

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en-us LUSPSJ8UU Membranes and Blotting Papers Blotting Membranes and Papers /webroot/web/html/lsr/solutions/technologies/western_blotting <p>Proteins are transferred from the gel to blotting membranes to make them amenable to immunodetection during western blotting. A variety of membrane types is available, each offering key attributes to suit particular experimental conditions. The physical properties and performance characteristics need to be evaluated when selecting a membrane for a specific application. This section provides an overview of blotting membranes offered by Bio-Rad and guidance on how to choose the best membrane for your applications.</p> <p><strong>Related Topics:</strong> <a href="/evportal/destination/solutions?catID=LUSPPSESH">Protein Blotting Methods</a>, <a href="/evportal/destination/solutions?catID=LUSPQXC4S">Protein Blotting Equipment</a>, and <a href="/evportal/destination/solutions?catID=LUSQA88UU">Transfer Buffers</a>.</p> Nitrocellulose and Supported Nitrocellulose <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=9b5b2069-356c-447b-a0fd-cae196945394">Nitrocellulose</a> was one of the first membranes used for western blotting and is still a popular membrane for this procedure. Protein binding to nitrocellulose is instantaneous, nearly irreversible, and quantitative to 80&ndash;100 &micro;g/cm<sup>2</sup>. Nitrocellulose is easily wetted in water or transfer buffer and is compatible with a wide range of protein detection systems. Unsupported nitrocellulose is innately fragile and is not recommended for stripping and reprobing.</p> <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=db84eb23-ed7e-4d28-b1f6-7032f171ab4b">Supported nitrocellulose</a> is an inert support structure with nitrocellulose applied to it. The support structure gives the membrane increased strength and resilience. Supported nitrocellulose can withstand reprobing and autoclaving (121&deg;C) and retains the ease of wetting and protein binding features of nitrocellulose.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Polyvinylidene Difluoride (PVDF) Membranes <p>PVDF membranes are an ideal support for N-terminal sequencing, amino acid analysis, and immunoassay of blotted proteins (<a href="/evportal/destination/solutions?catID=LUSPPAKG4">western blotting</a>). PVDF retains proteins during exposure to acidic or basic conditions and in the presence of organic solvents. Greater protein retention during sequencing manipulations enhances the likelihood of obtaining information from rare, low-abundance proteins by increased initial coupling and higher repetitive yields. In addition, PVDF membranes exhibit better binding efficiency of electroblotted material in the presence of SDS in the transfer buffer.</p> <p>PVDF membranes must be wetted in 100% methanol prior to use, but once wet may be used with a transfer buffer that contains no methanol. Bio-Rad offers PVDF membranes specifically designed for protein sequencing and for immunodetection. Both are available in precut sheets, rolls, and sandwich formats.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Immun-Blot and Immun-Blot LF PVDF for Western Blotting <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=9f95f7dc-8ad2-4923-8eb4-be822b64e2f4">Immun-Blot PVDF membranes</a> have a strong binding capacity of 150&ndash;160 &micro;g/cm<sup>2</sup> (roughly twice that of nitrocellulose), will not rack or tear in common handling, and can withstand repeated stripping and reprobing.</p> <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=LN7REQ15">Immun-Blot LF PVDF membranes</a> combine the advantages of Immun-Blot PVDF membranes with low autofluorescence properties across a wide range of excitation and emission wavelengths. This low autofluorescence allows longer exposure times without increasing background fluorescence levels, allowing fluorescent detection of faint signals and maximizing the detection capabilities of the imaging system.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Sequi-Blot&trade; PVDF for Protein Sequencing <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=35d0009b-498f-41a9-973b-74f5fa250479">Sequi-Blot PVDF membrane</a> withstands the conditions of N-terminal sequencing while providing the binding capacity to sequence even low-abundance samples.</p> <p><strong>Guide to protein blotting membranes.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td style="border-topx:1px solid #000;" valign="top"><strong>Membrane</strong></td> <td style="border-topx:1px solid #000;" width="10%" valign="top"><strong>Pore Size</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Binding Capacity (&micro;g/cm<sup>2</sup>)</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Compatible Detection Method</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Notes</strong></td> </tr> <tr> <td style="border-topx:1px solid #000;" valign="top">Nitrocellulose</td> <td style="border-topx:1px solid #000;" valign="top">0.45 &micro;m 0.2 &micro;m</td> <td style="border-topx:1px solid #000;" valign="top">80&ndash;100</td> <td style="border-topx:1px solid #000;" valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive</td> <td style="border-topx:1px solid #000;" valign="top">General-purpose protein blotting membrane</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Supported nitrocellulose</td> <td valign="top">0.45 &micro;m 0.2 &micro;m</td> <td valign="top">80&ndash;100</td> <td valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive</td> <td valign="top">Pure nitrocellulose cast on an inert synthetic support; increased strength for easier handling and for reprobing</td> </tr> <tr> <td valign="top">Immun-Blot PVDF</td> <td valign="top">0.2 &micro;m</td> <td valign="top">150&ndash;160</td> <td valign="top">Colorimetric Chemiluminescence Radioactive</td> <td valign="top">High mechanical strength and chemical stability; recommended for western blotting</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Immun-Blot LF PVDF</td> <td valign="top">0.45 &micro;m</td> <td valign="top">155&ndash;300</td> <td valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescent</td> <td valign="top">High mechanical strength and chemical stability; low autofluorescence; recommended for western blotting using fluorescent detection</td> </tr> <tr> <td style="border-bottomx:1px solid #000;" valign="top">Sequi-Blot&trade; PVDF</td> <td style="border-bottomx:1px solid #000;" valign="top">0.2 &micro;m</td> <td style="border-bottomx:1px solid #000;" valign="top">170&ndash;200</td> <td style="border-bottomx:1px solid #000;" valign="top">Colorimetric Radioactive</td> <td style="border-bottomx:1px solid #000;" valign="top">High mechanical strength and chemical stability; recommended for protein sequencing</td> </tr> </tbody> </table> <div class="top"><a href="#helptop">Back to Top</a></div> Blotting Filter Papers <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1172dcb6-635f-46e3-b0db-76ccbb39413e">Blotting filter paper</a>, made of 100% cotton fiber, provides a uniform flow of buffer through the gel and contains no additives that might interfere with the transfer process. Precut filter paper is available in a wide range of convenient sizes to eliminate waste and save time. Extra thick absorbent filter paper is recommended for semi-dry transfers because of its additional fluid capacity.</p> <p><strong>Guide to precut membranes and filter paper.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td style="border-topx:1px solid #000;" valign="top"><strong>Blotting Cells</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Precut Membranes</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Precut Blot Filter Papers</strong></td> </tr> <tr> <td style="border-topx:1px solid #000;" valign="top">Mini Trans-Blot&reg; cell</td> <td style="border-topx:1px solid #000;" valign="top">7 x 8.5 cm</td> <td style="border-topx:1px solid #000;" valign="top">7.5 x 10 cm</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Criterion&trade; blotter</td> <td valign="top">8.5 x 13.5 cm</td> <td valign="top">9.5 x 15.2 cm</td> </tr> <tr> <td valign="top">Trans-Blot<sup>&reg;</sup> cell</td> <td valign="top">13.5 x 16.5 cm</td> <td valign="top">15 x 20 cm</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Trans-Blot<sup>&reg;</sup> Plus cell</td> <td valign="top">26.5 x 28 cm</td> <td valign="top">26.5 x 28 cm</td> </tr> <tr> <td valign="top">Trans-Blot<sup>&reg;</sup> SD cell</td> <td valign="top">7 x 8.5 cm<br />11.5 x 16 cm<br />15 x 15 cm<br />15 x 9.2 cm<br />20 x 20 cm</td> <td valign="top">15 x 15 cm (extra thick)</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Trans-Blot<sup>&reg;</sup> Turbo&trade;</td> <td colspan="2" valign="top">7 x 8.5 cm and 8.5 x 13.5 cm<br />Transfer packs include precut<br />membrane and filter paper</td> </tr> <tr> <td valign="top">Bio-Dot<sup>&reg;</sup> apparatus</td> <td valign="top">9 x 12 cm</td> <td valign="top">N/A</td> </tr> <tr class="pd_colorbackground"> <td style="border-bottomx:1px solid #000;" valign="top">Bio-Dot SF apparatus</td> <td style="border-bottomx:1px solid #000;" valign="top">9 x 12 cm</td> <td style="border-bottomx:1px solid #000;" valign="top">11.3 x 7.7 cm</td> </tr> </tbody> </table> <div class="top"><a href="#helptop">Back to Top</a></div> Membrane/Filter Paper Sandwiches <p>Precut and preassembled sandwiches save time and effort during western blot preparation. In Bio-Rad's membrane sandwiches, a precut membrane (nitrocellulose or PVDF) and two sheets of 100% cotton-fiber thick filter paper are preassembled into a blotting membrane/filter paper sandwich.</p> <div class="top"><a href="#helptop">Back to Top</a></div> 2895 Protein Blotting Guide, Ver C 2895 /webroot/web/pdf/lsr/literature/Bulletin_2895.pdf Literature PDF Other /webroot/web/images/general/icons/icon_pdf.gif Protein Blotting Guide No Protein Blotting Guide, Ver C 2895 Bulletin 2895, horseradish peroxidase (HRP), enzyme-antibody complex, alkaline phosphatase (AP), nitroblue tetrazolium (NBT) tablets, BCIP, secondary antibody probe, amido black, streptavidin-biotin, anionic dye, total protein blotting stain, nitrocellulose, supported nitrocellulose or polyvinylidene difluoride (PVDF) or low fluorescence LF PVDF membranes, antibody, immunoglobulin (IgG), antigen, assay, avidin, biotin, background, non-specific noise, Bjerrum Schafer-Nielsen buffer, blocking reagent, Western blotting, BLOTTO, chemiluminescence, colloidal gold, color development reagent, colorimetric detection, chemiluminescent detection, enzyme-antibody conjugate, Coomassie Blue stain, diaminobenzidine (DAB), dot blot, Dunn buffer, electrophoretic blotting, foam pads, filter paper, gelatin, high-intensity transfer, immunoassay, immunoblotting, immunodetection, ligand, membrane, membrane/filter paper sandwiches, microfiltration blotting, multiplexing, multiscreen apparatus, native PAGE, polyacrylamide gel electrophoresis, NHS-biotin, non-enzymatic probe, nonenzymatic probe, non-fat dry milk, non-specific binding, phycobiliprotein, power supply, primary antibody, prestained standards, molecular weight markers or ladders, Protein A, Protein G, rapid semi-dry blotting, SDS-PAGE, sodium dodecyl sulfate, sodium dodecyl sulphate, signal-to-noise ratio, signal to noise ratio, Stain-free technology, CCD imager, charge-coupled device, StrepTactin, Strep-tag sequence, substrate, super cooling coil, tank blotting, Towbin buffer, Tween 20 2032 Western Blotting Detection Reagents Brochure, Rev F 2032 /webroot/web/pdf/lsr/literature/Bulletin_2032F.pdf Literature PDF Product_Information_Sheets /webroot/web/images/general/icons/icon_pdf.gif Western Blotting Detection Reagents Brochure No Western Blotting Detection Reagents Brochure, Rev F 2032 western, blotting, blot, protein, reagent, specific antigen, horseradish peroxidase, alkaline phosphatase, primary, secondary, antibody, conjugate, conjugates, signal, total protein, block nonspecific sites, incubate, fluorescent stain, anionic dye, colloidal gold, chemiluminescence, color development, selection guide, immune-star, westernc, chemiluminescent, hrp, ap, amplified opti-4cn, dab, immun-blot, enzyme-conjugated antibodies, substrate, luminal, cdp-star, nitrocellulose, pvdf membrane blots, ccd imager, quantity one software, 170-5040, 170-5041, 170-5043, 170-5042, 170-5044, 170-5045, 170-5047, 170-5046. 170-5010, 170-5011, 170-5012, 170-5018, 170-5070, 1705040, 1705041, 1705043, 1705042, 1705044, 1705045, 1705047, 1705046, 1705010, 1705011, 1705012, 1705018, 1705070, bio-safe coomassie blue, uv, sypro ruby, 170-6527, 170-3127, 161-0786, 1706527, 1703127, 1610786, colorimetric, film-based, film, bcip/nbt, bcip, nbt, 4cn, premixed, sensitivity, background, 170-6463, 170-6464, 170-6465, 170-6460, 170-6461, 170-6462, 170-8237, 170-8239, 170-8240, 170-8235, 170-8238, 170-6432, 170-6431, 170-6534, 170-6539, 170-6532, 170-6535, 170-6518, 170-6520, 170-6521, 170-6515, 170-6516, 172-1050, 170-6533, 170-6528, 170-3554, 170-6522, 170-6425, powdered, liquid, standards, precision plus protein, strep-tag, strep-tagged, streptactin, on-blot, molecular weight estimation, transfer efficiency, unstained, dual color, xtra, kaleidoscope, all blue, biotinylated, prestained sds-page, band pattern, monitoring, low range, high, broad, avidin, 161-0376, 161-0385, 161-0363, 161-0374, 161-0394, 161-0377, 161-0375, 161-0395, 161-0373, 161-0393, 161-0305, 161-0309, 161-0318, 161-0324, 161-0325, 161-0311, 161-0306, 161-0319, 161-0312, 161-0313, 161-0307, 161-0308, 161-0321, 161-0322, 161-0380, 161-0382, 1610376, 1610385, 1610363, 1610374, 1610394, 1610377, 1610375, 1610395, 1610373, 1610393, 1610305, 1610309, 1610318, 1610324, 1610325, 1610311, 1610306, 1610319, 1610312, 1610313, 1610307, 1610308, 1610321, 1610322, 1706528, 1706533, 1610380, 1610382, 170-5015, CDPstar, 1705015 1529 Western Blotting Troubleshooting, Rev C 1529 /webroot/web/pdf/lsr/literature/Bulletin_1529.pdf Literature PDF Other /webroot/web/images/general/icons/icon_pdf.gif No Western Blotting Troubleshooting, Rev C 1529 lit1529, bulletin 1529, western blot, western blotting, immunoblot, immunoblotting, protein analysis, immunodetection, troubleshooting, trans-blot, nitrocellulose, pvdf, problem, trouble, antibody dilution, tween, trans-blot, sd, mini trans blot, 170-4155, 17-3940, 170-3848, 170-3849, 170-3930, 170-3935, 170-3989, 170-3836, 165-8033, 165-8034, 165-8035, 165-8036, 165-8029, 165-8030, 170-3939, 170-3853, 170-3946, 170-3850, 170-3910, 170-3825, 170-3990, 170-3991, 170-3992, 165-4144, 1704155, 173940, 1703848, 1703849, 1703930, 1703935, 1703989, 1703836, 1658033, 1658034, 1658035, 1658036, 1658029, 1658030, 1703939, 1703853, 1703946, 1703850, 1703910, 1703825, 1703990, 1703991, 1703992, 1654144 6211 Transfer Buffer Formulations, Ver B 6211 /webroot/web/pdf/lsr/literature/Bulletin_6211.pdf Literature PDF Brochures_and_Specifications /webroot/web/images/general/icons/icon_pdf.gif Transfer Buffer Formulations No Transfer Buffer Formulations 6211 6211, western blot, transfer buffer, towbin, bjerrum schafer-nielsen, caps, dunn carbonate, acetic acid, protein transfer, nitrocellulose membrane, pvdf, buffer conductivity, protein blotting guide Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Semi-Dry Blotting Systems/Trans-Blot Turbo Transfer System ->MTS::LGOQBW15##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Microfiltration and Screening Systems/Bio-Dot and Bio-Dot SF Microfiltration Apparatus ->MT::d986e28f-4a82-4c13-8ce1-3eae9bb4fdbb##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Wet/Tank Blotting Systems/Trans-Blot Cell ->MT::a9900af6-f596-45c8-859e-9985048a418e##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Western Blotting Membranes and Filter Paper/Nitrocellulose transfer membranes, 0.45 microm ->MT::9b5b2069-356c-447b-a0fd-cae196945394##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Western Blotting Membranes and Filter Paper/Immun-Blot PVDF (for Western Blotting) ->MT::9f95f7dc-8ad2-4923-8eb4-be822b64e2f4## Life Science Research/Solutions/Applications/2-D Electrophoresis and Analysis ->MTS::LUSQF04EH##Life Science Research/Solutions/Technologies/Protein Electrophoresis ->MTS::LUSOVO47B## Life Science Research/Solutions/Applications/Protein Separation and Analysis/Fast Separation Transfer and Analysis ->MTS::LUSOUMFCN## Eddie C Blotting Membranes & Papers 12/06/11 02:56 PM 12/06/21 03:19 PM 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/Western_Blotting N 0 Introduction to Western Blotting /en-us/applications-technologies/applications-technologies/blotting-membranes-papers?ID=LUSPPAKG4

Proteins are transferred from the gel to blotting membranes to make them amenable to immunodetection during western blotting. A variety of membrane types is available, each offering key attributes to suit particular experimental conditions. The physical properties and performance characteristics need to be evaluated when selecting a membrane for a specific application. This section provides an overview of blotting membranes offered by Bio-Rad and guidance on how to choose the best membrane for your applications.

Related Topics: Protein Blotting Methods, Protein Blotting Equipment, and Transfer Buffers.

 

Nitrocellulose and Supported Nitrocellulose

Nitrocellulose was one of the first membranes used for western blotting and is still a popular membrane for this procedure. Protein binding to nitrocellulose is instantaneous, nearly irreversible, and quantitative to 80–100 µg/cm2. Nitrocellulose is easily wetted in water or transfer buffer and is compatible with a wide range of protein detection systems. Unsupported nitrocellulose is innately fragile and is not recommended for stripping and reprobing.

Supported nitrocellulose is an inert support structure with nitrocellulose applied to it. The support structure gives the membrane increased strength and resilience. Supported nitrocellulose can withstand reprobing and autoclaving (121°C) and retains the ease of wetting and protein binding features of nitrocellulose.

 

Polyvinylidene Difluoride (PVDF) Membranes

PVDF membranes are an ideal support for N-terminal sequencing, amino acid analysis, and immunoassay of blotted proteins (western blotting). PVDF retains proteins during exposure to acidic or basic conditions and in the presence of organic solvents. Greater protein retention during sequencing manipulations enhances the likelihood of obtaining information from rare, low-abundance proteins by increased initial coupling and higher repetitive yields. In addition, PVDF membranes exhibit better binding efficiency of electroblotted material in the presence of SDS in the transfer buffer.

PVDF membranes must be wetted in 100% methanol prior to use, but once wet may be used with a transfer buffer that contains no methanol. Bio-Rad offers PVDF membranes specifically designed for protein sequencing and for immunodetection. Both are available in precut sheets, rolls, and sandwich formats.

 

Immun-Blot and Immun-Blot LF PVDF for Western Blotting

Immun-Blot PVDF membranes have a strong binding capacity of 150–160 µg/cm2 (roughly twice that of nitrocellulose), will not rack or tear in common handling, and can withstand repeated stripping and reprobing.

Immun-Blot LF PVDF membranes combine the advantages of Immun-Blot PVDF membranes with low autofluorescence properties across a wide range of excitation and emission wavelengths. This low autofluorescence allows longer exposure times without increasing background fluorescence levels, allowing fluorescent detection of faint signals and maximizing the detection capabilities of the imaging system.

 

Sequi-Blot™ PVDF for Protein Sequencing

Sequi-Blot PVDF membrane withstands the conditions of N-terminal sequencing while providing the binding capacity to sequence even low-abundance samples.

Guide to protein blotting membranes.

Membrane Pore Size Binding Capacity (µg/cm2) Compatible Detection Method Notes
Nitrocellulose 0.45 µm 0.2 µm 80–100 Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive General-purpose protein blotting membrane
Supported nitrocellulose 0.45 µm 0.2 µm 80–100 Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive Pure nitrocellulose cast on an inert synthetic support; increased strength for easier handling and for reprobing
Immun-Blot PVDF 0.2 µm 150–160 Colorimetric Chemiluminescence Radioactive High mechanical strength and chemical stability; recommended for western blotting
Immun-Blot LF PVDF 0.45 µm 155–300 Colorimetric Chemiluminescence Chemifluorescence Fluorescent High mechanical strength and chemical stability; low autofluorescence; recommended for western blotting using fluorescent detection
Sequi-Blot™ PVDF 0.2 µm 170–200 Colorimetric Radioactive High mechanical strength and chemical stability; recommended for protein sequencing
 

Blotting Filter Papers

Blotting filter paper, made of 100% cotton fiber, provides a uniform flow of buffer through the gel and contains no additives that might interfere with the transfer process. Precut filter paper is available in a wide range of convenient sizes to eliminate waste and save time. Extra thick absorbent filter paper is recommended for semi-dry transfers because of its additional fluid capacity.

Guide to precut membranes and filter paper.

Blotting Cells Precut Membranes Precut Blot Filter Papers
Mini Trans-Blot® cell 7 x 8.5 cm 7.5 x 10 cm
Criterion™ blotter 8.5 x 13.5 cm 9.5 x 15.2 cm
Trans-Blot® cell 13.5 x 16.5 cm 15 x 20 cm
Trans-Blot® Plus cell 26.5 x 28 cm 26.5 x 28 cm
Trans-Blot® SD cell 7 x 8.5 cm
11.5 x 16 cm
15 x 15 cm
15 x 9.2 cm
20 x 20 cm
15 x 15 cm (extra thick)
Trans-Blot® Turbo™ 7 x 8.5 cm and 8.5 x 13.5 cm
Transfer packs include precut
membrane and filter paper
Bio-Dot® apparatus 9 x 12 cm N/A
Bio-Dot SF apparatus 9 x 12 cm 11.3 x 7.7 cm
 

Membrane/Filter Paper Sandwiches

Precut and preassembled sandwiches save time and effort during western blot preparation. In Bio-Rad's membrane sandwiches, a precut membrane (nitrocellulose or PVDF) and two sheets of 100% cotton-fiber thick filter paper are preassembled into a blotting membrane/filter paper sandwich.

 

Related Content

 
Literature
Number Description Download
2895 Protein Blotting Guide, Ver C Click to download
2032 Western Blotting Detection Reagents Brochure, Rev F Click to download
1529 Western Blotting Troubleshooting, Rev C Click to download
6211 Transfer Buffer Formulations, Ver B Click to download
 
 
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A variety of membrane types is available, each offering key attributes to suit particular experimental conditions. The physical properties and performance characteristics need to be evaluated when selecting a membrane for a specific application. This section provides an overview of blotting membranes offered by Bio-Rad and guidance on how to choose the best membrane for your applications.</p> <p><strong>Related Topics:</strong> <a href="/evportal/destination/solutions?catID=LUSPPSESH">Protein Blotting Methods</a>, <a href="/evportal/destination/solutions?catID=LUSPQXC4S">Protein Blotting Equipment</a>, and <a href="/evportal/destination/solutions?catID=LUSQA88UU">Transfer Buffers</a>.</p> Nitrocellulose and Supported Nitrocellulose <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=9b5b2069-356c-447b-a0fd-cae196945394">Nitrocellulose</a> was one of the first membranes used for western blotting and is still a popular membrane for this procedure. Protein binding to nitrocellulose is instantaneous, nearly irreversible, and quantitative to 80&ndash;100 &micro;g/cm<sup>2</sup>. Nitrocellulose is easily wetted in water or transfer buffer and is compatible with a wide range of protein detection systems. Unsupported nitrocellulose is innately fragile and is not recommended for stripping and reprobing.</p> <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=db84eb23-ed7e-4d28-b1f6-7032f171ab4b">Supported nitrocellulose</a> is an inert support structure with nitrocellulose applied to it. The support structure gives the membrane increased strength and resilience. Supported nitrocellulose can withstand reprobing and autoclaving (121&deg;C) and retains the ease of wetting and protein binding features of nitrocellulose.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Polyvinylidene Difluoride (PVDF) Membranes <p>PVDF membranes are an ideal support for N-terminal sequencing, amino acid analysis, and immunoassay of blotted proteins (<a href="/evportal/destination/solutions?catID=LUSPPAKG4">western blotting</a>). PVDF retains proteins during exposure to acidic or basic conditions and in the presence of organic solvents. Greater protein retention during sequencing manipulations enhances the likelihood of obtaining information from rare, low-abundance proteins by increased initial coupling and higher repetitive yields. In addition, PVDF membranes exhibit better binding efficiency of electroblotted material in the presence of SDS in the transfer buffer.</p> <p>PVDF membranes must be wetted in 100% methanol prior to use, but once wet may be used with a transfer buffer that contains no methanol. Bio-Rad offers PVDF membranes specifically designed for protein sequencing and for immunodetection. Both are available in precut sheets, rolls, and sandwich formats.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Immun-Blot and Immun-Blot LF PVDF for Western Blotting <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=9f95f7dc-8ad2-4923-8eb4-be822b64e2f4">Immun-Blot PVDF membranes</a> have a strong binding capacity of 150&ndash;160 &micro;g/cm<sup>2</sup> (roughly twice that of nitrocellulose), will not rack or tear in common handling, and can withstand repeated stripping and reprobing.</p> <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=LN7REQ15">Immun-Blot LF PVDF membranes</a> combine the advantages of Immun-Blot PVDF membranes with low autofluorescence properties across a wide range of excitation and emission wavelengths. This low autofluorescence allows longer exposure times without increasing background fluorescence levels, allowing fluorescent detection of faint signals and maximizing the detection capabilities of the imaging system.</p> <div class="top"><a href="#helptop">Back to Top</a></div> Sequi-Blot&trade; PVDF for Protein Sequencing <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=35d0009b-498f-41a9-973b-74f5fa250479">Sequi-Blot PVDF membrane</a> withstands the conditions of N-terminal sequencing while providing the binding capacity to sequence even low-abundance samples.</p> <p><strong>Guide to protein blotting membranes.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td style="border-topx:1px solid #000;" valign="top"><strong>Membrane</strong></td> <td style="border-topx:1px solid #000;" width="10%" valign="top"><strong>Pore Size</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Binding Capacity (&micro;g/cm<sup>2</sup>)</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Compatible Detection Method</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Notes</strong></td> </tr> <tr> <td style="border-topx:1px solid #000;" valign="top">Nitrocellulose</td> <td style="border-topx:1px solid #000;" valign="top">0.45 &micro;m 0.2 &micro;m</td> <td style="border-topx:1px solid #000;" valign="top">80&ndash;100</td> <td style="border-topx:1px solid #000;" valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive</td> <td style="border-topx:1px solid #000;" valign="top">General-purpose protein blotting membrane</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Supported nitrocellulose</td> <td valign="top">0.45 &micro;m 0.2 &micro;m</td> <td valign="top">80&ndash;100</td> <td valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescence Radioactive</td> <td valign="top">Pure nitrocellulose cast on an inert synthetic support; increased strength for easier handling and for reprobing</td> </tr> <tr> <td valign="top">Immun-Blot PVDF</td> <td valign="top">0.2 &micro;m</td> <td valign="top">150&ndash;160</td> <td valign="top">Colorimetric Chemiluminescence Radioactive</td> <td valign="top">High mechanical strength and chemical stability; recommended for western blotting</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Immun-Blot LF PVDF</td> <td valign="top">0.45 &micro;m</td> <td valign="top">155&ndash;300</td> <td valign="top">Colorimetric Chemiluminescence Chemifluorescence Fluorescent</td> <td valign="top">High mechanical strength and chemical stability; low autofluorescence; recommended for western blotting using fluorescent detection</td> </tr> <tr> <td style="border-bottomx:1px solid #000;" valign="top">Sequi-Blot&trade; PVDF</td> <td style="border-bottomx:1px solid #000;" valign="top">0.2 &micro;m</td> <td style="border-bottomx:1px solid #000;" valign="top">170&ndash;200</td> <td style="border-bottomx:1px solid #000;" valign="top">Colorimetric Radioactive</td> <td style="border-bottomx:1px solid #000;" valign="top">High mechanical strength and chemical stability; recommended for protein sequencing</td> </tr> </tbody> </table> <div class="top"><a href="#helptop">Back to Top</a></div> Blotting Filter Papers <p><a href="http://www.bio-rad.com/evportal/destination/commerce/product_detail?catID=1172dcb6-635f-46e3-b0db-76ccbb39413e">Blotting filter paper</a>, made of 100% cotton fiber, provides a uniform flow of buffer through the gel and contains no additives that might interfere with the transfer process. Precut filter paper is available in a wide range of convenient sizes to eliminate waste and save time. Extra thick absorbent filter paper is recommended for semi-dry transfers because of its additional fluid capacity.</p> <p><strong>Guide to precut membranes and filter paper.</strong></p> <table class="pd_table pd_gridlines" border="0"> <tbody> <tr> <td style="border-topx:1px solid #000;" valign="top"><strong>Blotting Cells</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Precut Membranes</strong></td> <td style="border-topx:1px solid #000;" valign="top"><strong>Precut Blot Filter Papers</strong></td> </tr> <tr> <td style="border-topx:1px solid #000;" valign="top">Mini Trans-Blot&reg; cell</td> <td style="border-topx:1px solid #000;" valign="top">7 x 8.5 cm</td> <td style="border-topx:1px solid #000;" valign="top">7.5 x 10 cm</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Criterion&trade; blotter</td> <td valign="top">8.5 x 13.5 cm</td> <td valign="top">9.5 x 15.2 cm</td> </tr> <tr> <td valign="top">Trans-Blot<sup>&reg;</sup> cell</td> <td valign="top">13.5 x 16.5 cm</td> <td valign="top">15 x 20 cm</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Trans-Blot<sup>&reg;</sup> Plus cell</td> <td valign="top">26.5 x 28 cm</td> <td valign="top">26.5 x 28 cm</td> </tr> <tr> <td valign="top">Trans-Blot<sup>&reg;</sup> SD cell</td> <td valign="top">7 x 8.5 cm<br />11.5 x 16 cm<br />15 x 15 cm<br />15 x 9.2 cm<br />20 x 20 cm</td> <td valign="top">15 x 15 cm (extra thick)</td> </tr> <tr class="pd_colorbackground"> <td valign="top">Trans-Blot<sup>&reg;</sup> Turbo&trade;</td> <td colspan="2" valign="top">7 x 8.5 cm and 8.5 x 13.5 cm<br />Transfer packs include precut<br />membrane and filter paper</td> </tr> <tr> <td valign="top">Bio-Dot<sup>&reg;</sup> apparatus</td> <td valign="top">9 x 12 cm</td> <td valign="top">N/A</td> </tr> <tr class="pd_colorbackground"> <td style="border-bottomx:1px solid #000;" valign="top">Bio-Dot SF apparatus</td> <td style="border-bottomx:1px solid #000;" valign="top">9 x 12 cm</td> <td style="border-bottomx:1px solid #000;" valign="top">11.3 x 7.7 cm</td> </tr> </tbody> </table> <div class="top"><a href="#helptop">Back to Top</a></div> Membrane/Filter Paper Sandwiches <p>Precut and preassembled sandwiches save time and effort during western blot preparation. In Bio-Rad's membrane sandwiches, a precut membrane (nitrocellulose or PVDF) and two sheets of 100% cotton-fiber thick filter paper are preassembled into a blotting membrane/filter paper sandwich.</p> <div class="top"><a href="#helptop">Back to Top</a></div> 2895 2032 1529 6211 Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Semi-Dry Blotting Systems/Trans-Blot Turbo Transfer System ->MTS::LGOQBW15##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Microfiltration and Screening Systems/Bio-Dot and Bio-Dot SF Microfiltration Apparatus ->MT::d986e28f-4a82-4c13-8ce1-3eae9bb4fdbb##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Wet/Tank Blotting Systems/Trans-Blot Cell ->MT::a9900af6-f596-45c8-859e-9985048a418e##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Western Blotting Membranes and Filter Paper/Nitrocellulose transfer membranes, 0.45 microm ->MT::9b5b2069-356c-447b-a0fd-cae196945394##Life Science Research/Products/Electrophoresis and Blotting/Protein Electrophoresis and Blotting/Western Blotting/Western Blotting Membranes and Filter Paper/Immun-Blot PVDF (for Western Blotting) ->MT::9f95f7dc-8ad2-4923-8eb4-be822b64e2f4## Life Science Research/Solutions/Applications/2-D Electrophoresis and Analysis ->MTS::LUSQF04EH##Life Science Research/Solutions/Technologies/Protein Electrophoresis ->MTS::LUSOVO47B## Life Science Research/Solutions/Applications/Protein Separation and Analysis/Fast Separation Transfer and Analysis ->MTS::LUSOUMFCN## Eddie C Blotting Membranes & Papers 12/06/11 02:56 PM 12/06/21 03:19 PM 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/Western_Blotting N 0
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