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Collaborative study of the Pro-milk method for the determination of protein in milk



Collaborative study of the Pro-milk method for the determination of protein in milk



Journal of the Association of Official Analytical Chemists 58(4): 770-772



7 milk samples and 2 standard dye solutions were analysed for protein content by the Pro-Milk method by 6 collaborating laboratories. Interlaboratory variations, although small, were significant, probably because of extremely good precision. Blind duplicates (2 sets) did not differ from each other. Tests of dilute dye solutions, involving only the colorimeters, showed interlaboratory variation, which indicates the need to carefully calibrate each instrument.

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