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Improving Curd-Forming Properties of Homogenized Milk¹

Department of Dairy and Food Industries, University of Wisconsin, Madison

ABSTRACT

Homogenizing milk for cheese reduces fat losses in the whey (6, 9, 12) and decreases leakage of fat from cheese stored at high temperatures (6, 11). Homogenization of milk influences its curd-forming properties with rennet. Trout (10) has reviewed this subject thoroughly. Gel strength is reduced and rate of coagulation is increased. Reduction in gel strength is directly related to the effectiveness of homogenizing.

Apparently no single explanation of the mechanism responsible for the lowering of gel strength by homogenization of the milk has been commonly accepted. One possibility is the adsorption of proteins on the newly created fat surfaces. Another suggestion is that fat disrupts the continuity of gel structure and that increasing the number of fat globules therefore increases the number of weak points.

Wilson and Johnson (11) and Nichols (6) studied the making of Cheddar cheese from homogenized milk as a means of decreasing leakage of fat from cheese exposed to above-normal temperatures.

¹ Approved for publication by the Director of the Wisconsin Agricultural Experiment Station.

² Present address: Diversey Corporation, Chicago.