【作者】 杨颖； 陆胜民； 陈剑兵； 邢建荣； 夏其乐；

【Author】 Yang Ying;Lu Shengmin;Chen Jianbing;Xing Jianrong;Xia Qile;Institute of Food Science,Zhejiang Academy of Agricultural Sciences,Key Laboratory of Fruits and Vegetables Postharvest and Processing of Zhejiang Province;

【机构】 浙江省农业科学院食品科学研究所浙江省果蔬保鲜与加工技术研究重点实验室；

【摘要】 为了延长葡萄柚精油的货架期,增强其赋香性能,该文以分子蒸馏技术去除葡萄柚原油中的部分柠檬烯,制备高浓缩精油。以蒸馏温度和压力为影响因子,以馏出物中的柠檬烯、馏余浓缩精油中的柠檬烯、芳樟醇及癸醛含量为响应值,在单因素试验的基础上,设计中心组合试验,对分子蒸馏工艺进行响应面优化。结果表明,蒸馏温度和压力对馏余浓缩精油中的柠檬烯、芳樟醇及癸醛含量均有明显影响,响应面模型优化的蒸馏温度为45.83℃、压力为500 Pa,馏出物中的柠檬烯、馏余浓缩精油中的柠檬烯、芳樟醇及癸醛的预测质量分数分别为94.84%、46.82%、1.52%和2.36%,实测质量分数分别为94.95%、46.62%、1.57%和2.35%,与预测含量基本吻合。浓缩后的产品呈棕褐色,香气更加醇厚、柔润,含氧化合物的总质量分数由原油中的3.41%上升到29.31%,实现了8.6倍浓缩。该研究可为其他柑橘类精油的精制浓缩提供参考。更多还原

【Abstract】 To extend the shelf life and improve aroma-endowing capacity of grapefruit essential oil,its limonene was partly removed through molecular distillation to develop highly concentrated grapefruit essential oil.Response surface model was established by central composite design experiment based on the results of single factor experiments,distillation temperature and pressure were selected as variable indexes,limonene content in distillated fraction,limonene,linalool and decanal contents in residual concentrated fraction were selected as evaluation values.The results revealed that distillation temperature and pressure affected limonene,linalool and decanal contents in residual concentrated fraction significantly.The optimized temperature was 45.83 ℃ and pressure was 500 Pa.In this optimized condition,the predicted values of limonene content in distillated fraction,limonene,linalool and decanal contents in residual concentrated fraction were 94.84%,46.82%,1.52%and 2.36%,respectively,which were very close to the real measurement values(94.95%,46.62%,1.57%and 2.35%,correspondingly).The color of concentrated oil was deep brown and its flavor was much more full-bodied,richer and softer than that of raw oil.According to GC-MS analysis,the total content of oxygenated compounds increased from 3.41%in raw oil to 29.31%in concentrated one,which indicated that 8.6 folds concentrated grapefruit essential oil was obtained.This concentration technology of grapefruit essential oil could be used as a reference for the refining of other kinds of citrus essential oil.更多还原