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Protein Quantification Kits on ZAGENO

CB-X™ Protein Assay (With BSA Standard) G-Biosciences
Quantification Method Bradford Detection Technique Colorimetry Sensitivity 0.5-50 µg
From $ 238.00 (500 Reactions)
Sizes 1 (500 Reactions)
Catalog IDs 786-12X
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BCA Protein Quantitation Kit RayBiotech
Quantification Method BCA Detection Technique Colorimetry Sensitivity 0.01-0.6 mg/ml
From $ 195.00 (1000 Reactions)
Sizes 2 (1000 Assays)
Catalog IDs 68QT-BCAPro-S1000, K812-1000
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RC DC™ Protein Assay Kit II Bio-Rad
Quantification Method Lowry Detection Technique Colorimetry Sensitivity /
From $ 305.00 (450 Assays)
Sizes 1 (450 Assays)
Catalog IDs 5000122
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Micro Bicinchoninic Acid (BCA) Protein Assay SKU : 10479 Cepham Life Sciences
From $ 192.00 (500 Assays)
Sizes 1 (500 Assays)
Catalog IDs 10479
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Pierce™ Quantitative Colorimetric Peptide Assay Thermo Fisher Scientific
Quantification Method / Detection Technique Colorimetry Sensitivity 25-1000 μg/ml
From $ 270.00 (500 Assays)
Sizes 1 (500 Assays)
Catalog IDs 23275
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Bicinchoninic Acid solution Sigma-Aldrich
Quantification Method BCA Detection Technique Colorimetry Sensitivity 200-1000 µg/ml protein
From $ 304.50 (1000 ml)
Sizes 1 (1000 ml)
Catalog IDs B9643-1L
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Pierce™ BCA Solid Thermo Fisher Scientific
Quantification Method BCA Detection Technique Colorimetry Sensitivity /
From $ 325.00 (25 g)
Sizes 1 (25 g)
Catalog IDs 23230
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RC DC™ Protein Assay Kit I Bio-Rad
Quantification Method Lowry Detection Technique Colorimetry Sensitivity 0.125-1.5 mg/ml
From $ 305.00 (450 Assays)
Sizes 1 (450 Assays)
Catalog IDs 5000121
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Bradford Protein Assay Kit OZ Biosciences
Quantification Method Bradford Detection Technique Colorimetry Sensitivity 0.5 µg
From $ 73.00 (2 Sets)
Sizes 3 (2 - 5000 Sets)
Catalog IDs BA00070, BA00050, ...
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Pierce™ BCA Protein Assay Reagent A Thermo Fisher Scientific
Quantification Method BCA Detection Technique Colorimetry Sensitivity 20-2000 µg/mL
From $ 62.00 (250 ml)
Sizes 4 (250 - 3750 ml)
Catalog IDs 23221, 23228, ...
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Pierce™ Bovine Serum Albumin Standard, 2 mg/mL Thermo Fisher Scientific
Quantification Method BCA, Bradford Detection Technique / Sensitivity /
From $ 65.00 (50 ml)
Sizes 1 (50 ml)
Catalog IDs 23210
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Quantifying Protein in a Sample

Quantification of protein concentration is a necessary first step during any protein analysis. There are various detection methods to achieve this, ranging from simple UV absorbance measurements (as amino acids exhibit strong UV-light absorption), to HPLC. However, the more cost effective technique is through the use of simple colorimetric assays.

Expand your understanding in our Knowledge Section. Perfect your experiments with our Troubleshooting Guides. Join in the discussion within our Community. Learn about ZAGENO at How It Works.

The Bradford method

One technique to determine protein concentration and the amount of sample is the Bradford method. Its principle: negatively charged Coomassie® Blue dye binds to positively charged proteins. When no proteins are present in the sample, the dye absorbs at 465 nm and has a red color. However, when proteins are introduced, the color changes to blue and absorbs at 595 nm. This absorption can then be cross-referenced to a standard curve. However, Bradford assays are often inhibited by detergents and can be difficult to read at certain concentrations. Thus, the method for protein quantification used will have to be curtailed to your experimental needs.

Our Bradford Assay Troubleshoot will help solve any issues you encounter.

BCA Protein Assay

The BCA Protein Assay uses bicinchoninic acid (BCA) to colorimetrically detect the color change produced by the cuprous cation (Cu1+), which results from the reduction of Cu2+ to Cu1+ by protein in an alkaline medium.

In the biuret reaction, copper chelates with protein in an alkaline solution to form a light blue complex; peptides with three or more amino acid residues form a chelate complex with cupric ions in the presence of sodium potassium tartrate.

Two molecules of BCA then chelate with one reduced cuprous cation to form an intense purple-colored product. The BCA/copper complex is water-soluble; producing a strong absorbance at 562 nm, proportional to protein concentration. The BCA reagent is 100 times more sensitive than the original pale blue color.

The reaction that leads to BCA color formation is strongly influenced by four amino acid residues (cysteine, tyrosine, and tryptophan). However, the peptide backbone also contributes to color formation, minimizing variability caused by differences in protein composition.

Lowry Assay

The Lowry protein assay uses cupric sulfate and tartrate in an alkaline solution, which forms tetradentate copper protein complexes when protein is added. Folin-Ciocalteu Reagent is reduced proportionally to these chelated copper complexes, producing a blue water-soluble product which can be measured at 750nm.

Compare Bradford Assay Products!

With our compare function, you can avoid all the time and energy wasted sifting through multiple web pages from different suppliers. At ZAGENO you can clearly see kits side-by-side, with the relevant attributes for each kit neatly in line for easy selection of the best product for you.

Click on the comparison below for a clearer view!

This example highlights how every kit has positive and negative aspects, and that only side-by-side comparison can allow you to correctly judge which is the right kit for you.

For instance, this comparison shows:

  • that the Bradford Protein Assay Kit (OZ) is the cheapest per preparation

  • that the Bio-Rad Protein Assay Kit I can use the largest amount of sample

  • that the CB Protein Assay requires no more than five minute incubation time, whereas the other two may require longer

The ZAGENO comparison engine does not show the best kit, but instead helps you, the researcher, choose the most sutiable kit for your experiment.

Go to our How it Works page for a guide to using the ZAGENO comparison engine.

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Video: teachinhawaii/YouTube