不同干燥方法对香茅挥发油成分及抗氧化活性的影响

Effects of Different Drying Methods on Composition and Antioxidative Activities of Volatile Oils from Cymbopogon Citrates

目的探讨不同干燥方法对香茅挥发油成分和抗氧化活性的影响,优选最佳干燥方式。方法通过晒干、阴干和40℃烘干干燥香茅药材,采用水蒸气蒸馏法提取香茅挥发油,并利用气相色谱-质谱联用仪分析挥发油成分,亚铁还原能力实验测定香茅挥发油的抗氧化活性。结果新鲜、晒干、阴干和40℃烘干的香茅挥发油提取率分别为0.25%、1.21%、1.19%和1.17%;不同干燥方法的香茅挥发油主要成分及抗氧化活性基本相同。结论不同干燥方法对香茅挥发油主要成分及抗氧化活性影响不大,香茅宜采用40℃恒温烘干。

Objective To discuss the effects of different drying methods on composition and antioxidative activities of the volatile oil from Cymbopogon citrates; To optimize the best drying method for Cymbopogon citrates. Methods Cymbopogon citrates was dried by drying in the sun, drying in the shade and oven drying at 40 ℃. Volatile oil was extracted by steam distillation. Chemical constituents in the volatile oil were analyzed by GC-MS and the antioxidative activities were determined by ferric reducing antioxidant power（FRAP method）. Results Extraction rate of the volatile oil from Cymbopogon citrates under the environment of freshness, sun drying, shade drying and oven drying at 40 ℃ were 0.25%, 1.21%, 1.19% and 1.17%, respectively; after dried by different methods, main constituents and antioxidative activities of the volatile oil from Cymbopogon citrates were basically same. Conclusion Different drying methods have little influence on composition and antioxidative activities of the volatile oil from Cymbopogon citrates. Oven drying at 40 ℃ was the best way to dry Cymbopogon citrates.