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The acceleration by cationic materials of the coagulation of casein micelles by rennet

Published online by Cambridge University Press:  01 June 2009

Margaret L. Green  and
R. J. Marshall
Margaret L. Green
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
R. J. Marshall
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading, RG2 9AT
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Summary

Three cationic materials markedly reduced the rennet clotting time of casein micelle suspensions, the efficacy of each being primarily dependent on the charge and the amount absorbed by the micelles. The reduction in coagulation time was unaffected by components of the milk serum other than salts. No enzymic action by lysozyme on casein micelles was detected. All materials acted by the same mechanism, increasing the affinity of rennet for the micelles and accelerating the aggregation phase. Coagulation did not occur until a minimum amount of κ-casein had been hydrolysed to para-κ-casein. All additives increased the proportion of added rennet retained by the casein in the coagulum. The results indicated that coagulation occurs by specific interactions between micelles modified by rennet.

Type
Original Articles
Information
Journal of Dairy Research , Volume 44 , Issue 3 , October 1977 , pp. 521 - 531
Copyright
Copyright © Proprietors of Journal of Dairy Research 1977

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