Study of Physical and Chemical Properties of the Adsorption “Membrane” around the Fat Globules in Cream. I. the Effect of the Adsorption “Membrane” of Synthetic Creams on Curd Tension of Cow's Milk

摘要: Summary Synthetic creams were made by emulsifying pure butter fat in the following aqueous sols: Dried whey sol, skim milk powder calcium caseinate gelatin and tissue fibrinogen (lecithoprotein material) sol. The resulting synthetic dispersed normal plasma to obtain "remade" whole milks which separated give corresponding creams. buttermilks prepared churning globule adsorption "membrane" from dried cream, when released buttermilk exerted a profound effect on rennet clot of buttermilk. This was characterized either total inhibition clotting or formation very soft fragile curd with little no syneresis. A still more pronounced found cases cream casemate cream. "Remade" these invariably had tension whatever did not show even visible coagulation addition rennet. Although CaCl 2 , rather large concentration, above restored somewhat their values, it has been shown phosphorus analysis papain that ultimate cause this phenomenon low tension, non-coagulation, is deep seated than lack Ca ++ being case cannot be regarded as restoring properties experiments simply because supplies system. only relatively slight reducing its compared derived complex non-coagulation rennet, abnormally buttermilks, always accompanied considerably lower pH surface respective milks. factors involved decreased lowered relation loss ability have subject extensive further study us. 7 7Part post doctorate work done senior author Dairy Chemistry Laboratory Industry Division, University California, Davis develop result hydrolysis esters acids "natural" esterase milk, are inhibited. Other important aspects findings will presented detail papers follow. It may stated briefly at time destruction certain due largely liberation caseinate, preventing rennin. also seriously affected, if affected all, except an unnatural agent substituted for natural cow's milk. Furthermore, lauric, myristic palmitic acid added directly allowed se fallow.