[Ultra-flash sterilization of fluid food by friction].
1978
: The ATAD process without heat exchange nor steam mixing allows the sterilization in a very short time. With milk, the sterility has been attained regularly at 140 degrees C/0,54 seconds. Only small changes occurred in nitrogen distribution. An homogeneizing effect upon fat emulsion is noticeable. The amino-acid composition of isoelectric fraction is not that of casein owing to the coprecipitation of a part of whey protein at pH 4,6, but they do not reveal any degradation. The enzymatic digestion of proteins (pepsin + Pancreatin) is a little improved by this treatment; the availability of lysine, measured by dinitrophenylation or guanidination, is hardly modified. All the blocked forms of lysine (Maillard reaction, lysino-alanine reaction, peptidoid boundings) occurs only under more drastic conditions. The beta-lactoglobulin-kappa-casein complex formation slightly hampers the enzymatic clotting of sterilized milk. The forms of calcium are not seriously disturbed and such a milk is suitable for cheesemaking; we can obtain cheese with very few non-lactic bacteria.
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