Protein concentration assay methods, analytical instrument and the analysis means

The present invention relates to a method for the evaluation of protein concentration, the analytical instrument and the analysis means. Providing a protein concentration assay method of using an indicator protein, it can be evaluated with high accuracy. Protein concentration assay method of the present invention includes: a color sample to the measurement indicator after contact with the protein of optical analysis, measurement of pH measurement target sample, and based on a result of the optical analysis of the measured and pH and protein concentration assay data to assess the protein concentration of the sample, the chromogenic indicator is a protein and the protein concentration as the pH varies indicator protein, the protein concentration evaluation data includes information indicating the information Method of evaluation result of the optical analysis corresponding to the measured pH.