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Comparison of the structure of micellar calcium phosphate in milk from six species by extended X-ray absorption fine structure spectroscopy

Published online by Cambridge University Press:  01 June 2009

James C. Irlam ,
Carl Holt ,
S. Samar Hasnainj  and
David W. L. Hukins
James C. Irlam
Affiliation:
Department of Medical Biophysics, University of Mancheste, Manchester M13 9PT, UK
Carl Holt
Affiliation:
Hannah Research Institute, Ayr KA6 5HL, UK
S. Samar Hasnainj
Affiliation:
Scientific and Engineering Research Council, Daresbury Laboratory, Warrington W A4 4AD, UK
David W. L. Hukins
Affiliation:
Department of Medical Biophysics, University of Mancheste, Manchester M13 9PT, UK
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Summary

Extended X-ray absorption fine structure spectra, above the Ca K absorption edge, were recorded from lyophilized casein micelles obtained from the milk of cow, pig, goat, rabbit and rat. A spectrum was also obtained from the calcium phosphate prepared from the casein micelles of human milk. Comparison of these spectra showed that the short-range environment of calcium in the micellar calcium phosphate was the same in all six species. Furthermore, these spectra closely resembled that of brushite (CaHP04. 2H20). However, X-ray diffraction showed no evidence for an extensive crystal lattice in micellar calcium phosphate.

Type
Original Articles
Information
Journal of Dairy Research , Volume 52 , Issue 2 , May 1985 , pp. 267 - 273
Copyright
Copyright © Proprietors of Journal of Dairy Research 1985

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