Negative Stain Solutions

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Negative Stain Solutions | Copper & Zinc Staining

Overview

Specifications
Product Shelf life Storage Lowest sensitivity Mass spectrometry
Zinc stain 1 year ambient 6 – 12 ng Yes
Copper stain 1 year ambient 6 – 12 ng Yes
Zinc-Stained Gel

Zinc-stained gel. The clear protein bands are visible on a black background as black or dark blue bands within the white zinc stain in the gel.

Copper-Stained Gel

Copper-stained gel. The gel is photographed against a black background.

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Bio-Rad negative stains are based on selective precipitation of metal ions in gels, leaving protein bands unstained and unmodified. Since the protein is unmodified, it is fully compatible with downstream applications such as mass spectrometry. These are easy and rapid procedures, requiring less than 15 minutes to complete. Bio-Rad offers two types of negative stains for polyacrylamide gel staining, both of which offer higher sensitivity than Coomassie Brilliant Blue R–250 stain.

Zinc stain – Bio-Rad zinc stain and destain kit, derived from the method of Fernandez-Patron et al. (1992), is a reversible negative stain for SDS- PAGE gels. A simple three-step staining procedure allows visualization of negatively stained bands in approximately 15 minutes. The opaque white background of the gel creates a high contrast for visualizing the clear bands when viewed against a dark background. Gels can be completely destained in 15 minutes, allowing western blotting, amino acid analysis, or N-terminal sequencing to be performed on samples.

Copper stain – Bio-Rad copper stain and destain kit, derived from the method of Lee et al. (1987), allows visualization of protein bands on SDS-PAGE gels in just 10 minutes. Because the proteins are negatively stained, no destaining step is necessary to see the bands. Proteins are reversibly fixed in the gel, allowing elution or blotting after a 15 minute destaining step. Copper stain has greater sensitivity than Coomassie Brilliant Blue R–250 stain.

References

 

Fernandez-Patron C et al. (1992). Reverse staining of sodium dodecyl sulfate polyacrylamide gels by imidazole-zinc salts: sensitive detection of unmodified proteins. Biotechniques 12, 564–573.

Lee C et al. (1987). Copper staining: a five-minute protein stain for sodium dodecyl sulfate-polyacrylamide gels. Anal Biochem 166, 308–312.

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Zinc Stain and Destain Kit

1610440
Reversible staining kit for polyacrylamide gels, includes 125 ml each 10x zinc stain solutions A and B, 10x zinc destain

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Hazardous  
(Discontinued) Copper Stain and Destain Kit

1610470
Reversible staining kit for polyacrylamide gels, includes 125 ml each 10x copper stain and destain

This product is no longer available. Please contact technical support for more information on replacement product.

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10x Copper Stain

1610471
125 ml, negative protein stain and replacement component of the copper stain and destain kit (#161-0470)

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Imidazole

1610441
125 ml, zinc stain solution A, 10x, must be used with zinc sulfate (#161-0442) for zinc staining of polyacrylamide gels

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(Discontinued) Zinc Sulfate

1610442
125 ml, zinc stain solution B, 10 x, must be used with imidazole (#161-0441) for zinc staining of polyacrylamide gels

This product is no longer available. Please contact technical support for more information on replacement product.

The following replacement is recommended:

  • Zinc Stain and Destain Kit (1610440)
Number Description Options
LIT464 Instruction Manual, Copper Stain and Destain Kit Click to download
4006082 Instruction Manual, Zinc Stain and Destain Kit, Rev A Click to download

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