The Influence of Lecithin from Different Sources on Crystallization and Physical Properties of Nontrans fat

Abstract

Crystallization and physical properties of nontrans vegetable fat with the addition of soybean, sunflower and rapeseed lecithin were investigated in this paper. NMR technique was used for measuring the solid fat content of fats at different temperatures, as well as for crystallization rate under static conditions. Also, the possibility of applying Gompertz function to define kinetics of crystallization was investigated. Rheological and textural properties were determined using the rotational viscometer and texture analyzer, whereas thermal properties were obtained by differential scanning calorimetry (DSC). The addition of lecithin from different sources does not affect the crystallization characteristics of nontrans edible fat, whereas rheological and textural tests confirmed that the addition of lecithin in excess increases the complexity of the system. DSC measurement confirmed the presence of three fractions in fat with different melting properties. The addition of lecithin from different sources has a significant effect on energy required for melting and some effect on other thermal properties of nontrans edible fat. © 2013 Wiley Periodicals, Inc.