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Natural variations in the average size of bovine casein micelles: III. Studies on colostrum by electron by microscopy and light scattering

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, KA6 5HL
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Summary

Bovine casein micelles in pre- and post-partum colostrum have been characterized by both electron microscopy and light scattering. Attempts have been made to relate the changes in average micelle size to the partitioning of Ca and inorganic orthophosphate betwen the colloidal and aqueous phases. Pre-partum colostrum, and to a decreasing extent post-partum colostrum, contain casein micelles several microns in diameter. These giant micelles often contain closed cavities suggesting that they are formed by aggregation of particles comparable in size to normal casein micelles. Electron microscopy of mammary gland alveoli from nearterm pregnant heifers shows clear differences in average size between micelles immediately before and after secretion from Golgi vesicles. It appears that micelles aggregate in the alveolar lumen, possibly as a result of continuing co-precipitation of casein with Ca phosphate.

Type
Original Articles
Information
Journal of Dairy Research , Volume 45 , Issue 3 , October 1978 , pp. 355 - 362
Copyright
Copyright © Proprietors of Journal of Dairy Research 1978

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References

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