Effects of pasteurization and frozen storage on changes in quality characteristics of 10 percent salted egg yolk

摘要

To obtain the basic data for commercial 10 percent salted egg yolk for mayonnaise preparation, 3 types of egg yolks [pasteurized egg yolk (Yolk A)-not salted, pasteurized before salting (Yolk B)-salted, and pasteurized after salting (Yolk C)-salted]were prepared, and the changes in quality characteristics of these egg yolks with frozen storage were tested. The results obtained were as follows; Yolk A gelatinized during frozen storage, thus could not used for mayonnaise preparation. The viscosity of the egg yolk increased 3-5 times after salting. Viscosity of the salted egg yolk increased with frozen storage time. Viscosity of Yolk B was higher at -20 deg C than -15 deg C. Viscosity of Yolk C, however, was higher at -15 deg C than -20 deg C. Frozen storage of pasteurized salted egg yolk showed some effects on the emulsification capacity. The effect, however, was smaller than that of unpasteurized salted egg yolk. Microbes of salted egg yolk were decreased with frozen storage, but there was no difference between Yolk B and Yolk C. It was suggested that commercially pasteurized 10 percent salted egg yolk for mayonnaise preparation can be successfully stored for 12 months at the temperature of -15--20 deg C.