Coomassie brilliant blue assay with improved sensitivity

Abstract

The present invention relates to the detection and quantitative measurement of proteins with the Coomassie Brilliant Blue Assay with improved sensitivity and maintaining high linearity over a broad measuring range. In particular the present invention relates to a method of detecting a protein in a protein-containing sample, comprising providing a sample comprising a protein, a reagent comprising Coomassie Brilliant Blue, combining the sample and the reagent and determining of the absorption to determine the amount of protein in the sample, wherein the pH-value of the reagent is between pH-value 0.85 and pH-value 1.1, and the ratio of the absorption value at a first wavelength of between about 580 to 620 nm to the one at a second wavelength of between about 520 to 370 nm is used in the spectral photometric determination of the amount of protein.

Dependencies are inferred from the claim text.