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Journal of Dairy Science Vol. 58 No. 1 13-18
© 1975 by American Dairy Science Association ®
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Action of Rennin on {kappa}-Casein

Elizabeth W. Bingham

Eastern Regional Research Center1, Philadelphia, PA 19118

ABSTRACT

The action of rennin on {kappa}-casein was studied as a function of time using several methods to measure activity. The first indication of rennin cleavage of {kappa}-casein is precipitability in .1 M acetate buffer at pH 5.2 and 5 C. A longer exposure to rennin is required to alter {kappa}-casein so that it forms a precipitate with calcium ions and loses its ability to stabilize {alpha}s-casein. The least sensitive indication of rennin activity is measurement of nitrogen soluble in 2% trichloroacetic acid. Electrophoresis experiments showed that these methods detect various stages in the conversion of {kappa}-casein to para-{kappa}-casein.

FOOTNOTES

1 Agricultural Research Service, United States Department of Agriculture.






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Copyright © 1975 by the American Dairy Science Association ®.