Effects of β-Lactoglobulin on the Rheological Properties of Casein Micelle Rennet Gels

Abstract

The effects of heat treatment on the gelation properties of casein micelle suspensions in the presence or absence of P-LG were studied using a rheolograph-sol apparatus, scanning electron microscopy, and transmission electron microscopy. In the absence of 0-LG, the characteristic parameters of the gelation curves (gel modulus, gelation time, and gelation rate) changed slightly as temperature increased from 65 to 80C. In the presence of 0-LG, the three parameters were strongly dependent on the temperature of the treatment; the gel modulus and the gelation rate at 80C were about 50 and 12.5%, respectively, of the values found at 65C. After heat treatment at various temperatures, the amounts of 0-