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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%。
The extraction of essential oil from Lemongrass in Hainan was carried out by steam distillation. The effects of extraction time, solid-liquid ratio, lemongrass weight, lemongrass part, extract composition and other factors on the yield and main components of essential oil were investigated. Was 0.09% ~ 1.06%. The dry lemongrass with the length of 50 g and the length of 2 cm was the highest in the 1 400 mL aqueous solution containing 8 g NaCl at 180 min extraction time, which was 1.06%. With the different extraction conditions, the essential oil components are different, but the main components did not change significantly, mainly geranial, neral, geraniol, geranic acid and linalool, the quality of the five main components of the total essential oil quality Of 86% ~ 96%. Electron spin resonance method test results show that the mass fraction of 1% ethanol solution of citronella essential oil on the hydroxyl radical has a scavenging activity, clearance rate of about 32%.