Patent ID: 7704744
Filing Date: 2010-04-27
Classification: G01N

Abstract:
1. A method for determining the content of casein in milk based on (i) the infrared absorbance of a milk sample measured, before and after a separation into casein and a liquid phase supernatant, and (ii) a dilution factor Df, determined using the infrared absorbance data after separation, which method consists essentially of: (A) determining a first infrared absorbance of a milk sample before separation; (B) calculating the concentration of protein in the milk sample before separation; (C) separating the milk sample into a supernatant and a precipitate; (D) determining a second infrared absorbance of a supernatant after separation; (E) calculating the concentration of protein in the supernatant after separation (F) determining the dilution factor for the supernatant based on the second infrared absorbance; and (G) calculating the casein concentration for the milk sample according to the equation: wherein P(Casein) is the casein concentration in the milk sample, P(Milk) is the protein concentration of the milk sample before separation, and P(SN) is the protein concentration of the supernatant after separation.