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Post-secretory aggregation of caseins

Published online by Cambridge University Press:  01 June 2009

Brian E. Brooker  and
Carl Holt
Brian E. Brooker
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
Carl Holt
Affiliation:
Hannah Research Institute, Ayr, Scotland, KA6 5HL
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Summary

Particles as large as several µm diam. have been observed occasionally in normal milk and commonly in prepartum and postpartum colostrum. These particles can be dissociated by EDTA and their appearance closely resembles that of normal casein micelles. However, they are often too large to have been completely formed within the Golgi vesicles of mammary epithelium and hence some degree of post-secretory aggregation of caseins is thought to occur. Two possible mechanisms of post-secretory aggregation of caseins are: (1) a continuation of the normal processes of micelle assembly in the alveolus and (2) aggregation as a result of limited proteolysis of the caseins during the time the milk is in the mammary gland. Incubation of milk with fibrinolysin, however, failed to produce aggregation of normal micelles.

Type
Section A. Biological Aspects of Milk Proteins
Information
Journal of Dairy Research , Volume 46 , Issue 2: Symposium on the Physics and Chemistry of Milk Proteins , April 1979 , pp. 193 - 195
Copyright
Copyright © Proprietors of Journal of Dairy Research 1979

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References

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