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A 43Ca and 31P NMR study of the calcium and phosphate equilibria in heated milk solutions

Published online by Cambridge University Press:  01 June 2009

N. Magnus Wahlgren ,
Petr Dejmek  and
Torbjörn Drakenberg
N. Magnus Wahlgren
Affiliation:
Department of Food Technology and University of Lund, Box 124, S-221 00 Lund, Sweden
Petr Dejmek
Affiliation:
Department of Food Technology and University of Lund, Box 124, S-221 00 Lund, Sweden
Torbjörn Drakenberg
Affiliation:
Department of Physical Chemistry 2, Chemical Centre, University of Lund, Box 124, S-221 00 Lund, Sweden
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Summary

Casein micelle suspensions, colloidal Ca phosphate-free casein solution and simulated milk ultrafiltrate (SMUF) were studied using high-resolution 43Ca and 31P NMR in the temperature range 4–64 °C. Only one 43Ca and one 31P signal was obtained for each solution. Signal intensities and line widths varied with the environment and were affected by the redistribution of Ca and P during heating and cooling. Based upon the temperature-dependent broadening of the 43Ca signal, five different Ca environments were discerned in the heated milk fractions. The Ca state, induced by heating of a casein-containing milk salt solution, differed from both the state of Ca present in micellar colloidal Ca phosphate and from the state of Ca induced by the heating of SMUF.

Type
Original Articles
Information
Journal of Dairy Research , Volume 57 , Issue 3 , August 1990 , pp. 355 - 364
Copyright
Copyright © Proprietors of Journal of Dairy Research 1990

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