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Influence of Mastitis on Properties of Milk. VIII. Distribution of Soluble and Micellar Casein¹

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

The effect of mastitis on the distribution of soluble and micellar casein in skim milk was investigated. Paired quarter milk samples from individual cows were selected on Wisconsin Mastitis Test positive (>20 mm) and negative (<10 mm) reactions. Approximately 51 to 78% of the total casein was sedimented from positive and 71 to 94% from negative skim milks by centrifu-gation at 56,000 to 144,000 x g for 1 h at 4 C. Dialysis of positive against negative skim milk (1:10 v/v ratio) for 36 h at 4 C increased casein sedimentation in positive skim milk. The concentration of soluble casein was higher and that of micellar casein lower in positive than in negative skim milks under varying conditions of calcium concentration, pH, and temperature. Soluble casein content was highest in both skim milks at about pH 5.5 and lowest at pH 6.5 for negative and pH 7.0 for positive skim milks.

¹ Technical paper no. 10162 of the Texas Agricultural Experiment Station, College Station.

² Present address: Phil's Industries Ltd, Caligary S.W., Alberta Canada.