Journal
JOURNAL OF DAIRY RESEARCH
Volume 68, Issue 1, Pages 81-94Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022029900004556
Keywords
milk; thermal coagulation; beta-lactoglobulin; casein; calcium
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The effect of beta -lactoglobulin and heat-induced precipitation of calcium phosphate on the pH dependence and mechanism of thermal coagulation of milk throughout the pH range 6.3-7.3 was studied using serum protein-free milk and. sodium caseinate as models for micellar and non-micellar milk protein systems respectively. It appears that the specific effect of beta -lactoglobulin at the pH of maximum stability may be related to its ability to chelate calcium. The effect of beta -lactoglobulin at the pH of minimum stability does not appear to be directly related to heat-induced dissociation of kappa -casein or micellar integrity but may be due to its ability to sensitize casein micelles to heat-induced precipitation of calcium phosphate, by increasing micellar hydrophobicity. The extent of heat-induced precipitation of calcium phosphate, as a function of pH, is an inverse reflection of the pH dependence of heat stability. Micellar integrity appears to play a critical role in the heat stability of milk but for reasons not previously appreciated.
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