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Journal of Dairy Science Vol. 57 No. 10 1159-1163
© 1974 by American Dairy Science Association ®
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Lactoferrin and Serum Albumin of Human Casein in Colostrum and Milk

T. Nagasawa, I. Kiyosawa and M. Takase

Central Research Laboratory, Morinaga Milk Industry Co., Ltd., Tokyo, Japan

ABSTRACT

Lactoferrin and serum albumin were measured immunologically in human colostrum and milk. Colostrum and milk contained .51 ± .11 and .19 ± .50 g of lactoferrin and .043 ± .016 and .030 ± .009 g of serum albumin per 100 ml.

Precipitated lactoferrin in colostrum and in milk at pH 4.7 was .016 ± .005 and .017 ± .005 g per 100 ml. Precipitated serum albumin was less than 1.5% of total serum albumin in the milk.

Acid casein, prepared by repeated isoelectric precipitation, contained 2.5 g of lactoferrin per 100 g protein. Lactoferrin was not detectable immunilogically in the major gel electrophoretic components of isoelectric human casein but was located in separate zones near the origin. Data relate to binding of lactoferrin and serum albumin by human casein.






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Copyright © 1974 by the American Dairy Science Association ®.