桂花精油提取工艺及其抗氧化性的研究

本文以新鲜的金桂花(Osmanthus fragrans Lour)为实验材料,采用微波-蒸馏萃取法提取桂花中的精油。通过改变微波-蒸馏萃取法中的各种工艺参数(匀浆时间、料液比、微波时间),得到相应工艺参数下的桂花精油提取率。采用单因素试验和正交试验,分析提取工艺过程中的参数和提取率得到最优化的桂花精油提取工艺条件,即匀浆时间4min、料液比1∶5、微波时间60s,同时桂花精油提取率为0.85%。根据对桂花精油的理化性质分析可知,实验所得桂花精油样品香气较为纯正,液体呈橘黄色,酸值大约为7.50,酯值大约为18.03,达到精油的国标标准且质量较好。对桂花精油采用磷钼络合物法进行抗氧化性的研究,表明桂花精油的抗氧化活性较强,同时桂花精油的浓度与抗氧化性成正比关系。

Study on Extraction of Oil from Osmanthus fragrans Lour and Its Antioxidant Activity

Osmanthus fragrans Lour was used as the experimental material,and microwave-distillation method was used for extracting the essential oil.By changing various process parameters(homogenizing time,solid-liquid ratio,the time of microwave irradiation)of microwave radiation and simultaneous distillation extraction method,we obtained the extraction rate of osmanthus oil with correspondent process parameter.Parameters and extraction rate of extraction process were analyzed through single-factor and orthogonal experiments,and subsequently optimized process parameters as following:homogenate time of 4min,material to solvent of 1:5,and microwave time of 60 s,while the extraction rate was 0.85%.The analysis of physicochemical propert of osmanthus essential oil showed that the production sample reached the national standard with purer flavor,orange-yellow color,the acid value of 7.50,and the ester number of 18.03.The antioxidant capacities of the osmanthus essential oil was studied by phosphomolybdenum complex method,and it suggested that the osmanthus essential oil has a high antioxidant activity,and the antioxidant capacities were proportional to the concentration.