柠檬香茅精油的提取及抗氧化活性

采用水蒸气蒸馏法对海南产柠檬香茅进行精油提取,考察了提取时间、料液比、香茅粗细、香茅部位、提取液成分等因素对精油收率及主要成分的影响,精油提取率为0.09%～1.06%;50 g长2 cm的干柠檬香茅在1 400 mL含8 g NaCl的水溶液中,提取时间180 min时精油出油率最高,为1.06%。随提取条件不同,精油成分有差异,但主要成分无明显变化,主要为香叶醛、橙花醛、香叶醇、香叶酸和芳樟醇,该5种主要成分的质量约占精油总质量的86%～96%。电子自旋共振法测试结果表明,质量分数1%香茅精油乙醇溶液对羟基自由基具有一定清除活性,清除率约32%。

Extraction and Antioxidant Activity of Cymbopogon Citratus Essential Oil

Cymbopogon Citratus from Hainan province was extracted through distillation extraction to obtain the essential oil.It was found that extraction time,solid-liquid ratio,grass particle size,plant part,and extracting solvent affected the yield and the components of the essential oil.The yield varied from 0.09% to 1.06%.When 50 g dry Cymbopogon Citratus with the length of 2 cm was extracted with 1 400 mL water containing 8 g sodium chloride for 180 min,the oil yield was 1.06%.Although a considerable chemical variability was observed,the essential oils were mainly composed of linalool,neral,geranial,geraniol,and geranic acid.The total amount of the five compounds varied between 86%~96%.Hydroxyl radical scavenging antioxidant activity of the essential oil was examined through electron paramagnetic resonance.The scavenging ability of 1% oil solution in ethanol was about 32%.