The heating of milk causes denaturation of the lactalbumin and lactoglobulin to an extent depending on both the temperature and the time of heating.
A series of data has been given for the amounts of albumin and globulin denatured on heating samples of milk at various temperatures from 63 to 80° C, for periods of from 2½ to 60 min.
An average of 10·4 per cent, of the total soluble protein was denatured after 30 min. heating at as low a temperature as 63° C.
Smooth curves were obtained for the progress of denaturation with time at each temperature, and, over the range of 63–75° C, the relative increase in velocity of denaturation for each rise in temperature of 1° C. was found to be constant, the temperature coefficient of the reaction being 1·5.
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