摘要
采用脂肪酶Lipozyme TL IM催化饱和单甘酯和棕榈油(24℃)进行酯交换反应,酯交换油脂经分子蒸馏分离纯化得到含28.10%甘油二酯(DAG)油。对比分析了酯交换反应前后油脂的甘油酯组成和脂肪酸组成、热力学性质以及固体脂肪含量(SFC)。结果表明:含DAG油的不饱和脂肪酸含量提高至42.94%,熔点降低至45.4℃,SFC值显著降低;X射线衍射结果表明含DAG油的晶型以β型和β'型为主;偏光显微镜观察结果表明含DAG油的晶体网络结构主要由球状晶体聚集而成,且晶体尺寸变小,固液相分散更均匀;结晶熔化曲线、SFC分布以及结晶特性均表明含DAG油适合用作食品专用油脂基料。
Interesterification of saturated monoacylgcerols and palm olein （24℃） was catalyzed by Lipozyme TL IM, then the oil containing 28.10% DAG was separated by molecular distillation. The glyc-eride composition, fatty acid composition, thermodynamic property and solid fat content （SFC） of the oil before and after interesterifieation were detected. The results showed that the contents of unsaturated fatty acid of the DAG - contained oil increased to 42.94% ; the melting decreased to 45.4℃ and SFC decreased remarkably. XRD results indicated that the main crystal forms of the DAG - contained oil mixtures were β and β＇. PLM results indicated that crystal network of DAG - contianed oil was mainly com-posed of spherical crystals with smaller size, and the distribution of solid and liquid phase was more evenly. The crystallization and melting curve, SFC distribution and crystallization behavior indicated that the DAG - contained oil could be applied as a special base oil in food industry.
出处
《中国油脂》
CAS
CSCD
北大核心
2017年第6期44-49,共6页
China Oils and Fats
基金
国家自然科学基金项目(31371785)
广东省科技计划项目(2013B090800009)
教育部“新世纪优秀人才”支持计划(NCET-12-0675)
广州市科技计划项目(2014Y2-00192)
