title: Physical characterization of lard partial acylglycerols and their effects on melting and crystallization properties of blends with rapeseed oil.
abstract: This work attempted to examine the effects of lard partial acylglycerols on the melting and crystallization properties of blends with lard and rapeseed oil (LR). Partial acylglycerols [lard-monoacylglycerols (lard-MAG) and lard-DAG] were found to result in different melting and crystallization properties of LR. Lard-MAG exerted slight inhibitory effect on crystallization of LR. Nevertheless, it was not statistically significant (P > 0.05). In fact, the presence of lard-MAG did not change the solid fat content (SFC) of LR. Lard-DAG, on the other hand, exerted different effects on the crystallization of LR depending on its concentration and degree of supercooling. The presence of a low concentration of lard-DAG was found to significantly (P < 0.05) delay nucleation and crystal growth velocity of LR at low degree of supercooling, which was reflected by a reduced Avrami constant (k) and SFC and increased half-time of crystallization (t(1/2)). Meanwhile, a high concentration of lard-DAG was found to promote nucleation and crystal growth in LR at low degrees of supercooling with increased k and SFC and decreased t(1/2). The characteristics of the blends may have correlations with their properties in potential meat applications.
authors.affiliation: Department of Molecular Biology, Aarhus University, Aarhus, Denmark.
authors.forename: Ling-Zhi
authors.initials: LZ
authors.lastname: Cheong
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Xuebing
authors.initials: X
authors.lastname: Xu
mesh_terms: D003460:Crystallization; D004041:Dietary Fats / Q000032:analysis*; D005229:Fatty Acids, Monounsaturated; D005615:Freezing; D005989:Glycerides / Q000737:chemistry*; D010938:Plant Oils / Q000737:chemistry*; D000074262:Rapeseed Oil; D044366:Transition Temperature
chemical_list: D004041:Dietary Fats; D005229:Fatty Acids, Monounsaturated; D005989:Glycerides; D010938:Plant Oils; D000074262:Rapeseed Oil; C029310:lard