Abstract: Methods for detection and quantitative measurement of proteins with a Coomassie Brilliant Blue Assay with improved sensitivity and maintaining high linearity over a broad measuring range are provided herein. In particular, a method of detecting a protein in a protein-containing sample is provided. The method includes providing a sample including a protein, a reagent including Coomassie Brilliant Blue and having a pH between 0.85 and 1.1, combining the sample and the reagent, and determining absorption at first and second wavelength to determine the amount of protein in the sample. The ratio of the absorption value at the first wavelength between about 580 to 620 nm to the absorption value at the second wavelength between about 520 to 370 nm is used in the spectral photometric determination of the amount of protein.

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.

Abstract: The present invention relates to a method for optically determining at least one analyte in a sample, in which a deviation from a reference value or the reference curve is evaluated as an indication that the optical determination of the at least one analyte is corrupted by measurement artifacts.

Abstract: The present invention relates to a method for optically determining at least one analyte in a sample, in which a deviation from a reference value or the reference curve is evaluated as an indication that the optical determination of the at least one analyte is corrupted by measurement artifacts.