利用固相微萃取，气相色谱 /质谱联用 (SPME/GC-MS)技术分析柠檬草的香气成分。
结果表明：在柠檬草中共鉴定出25种主要挥发性化合物，以碳氢化合和醛类物为主，包括β-月桂稀(34.34%)、石竹烯(0.493%)、 莰烯(0.646%)、D-柠檬烯(0.126%)、1R-α--蒎烯(0.73%)、柠檬醛(26.5%)、3,7二甲基-2，6-辛二稀醛(26.63%)等柠檬草中常见的香气成分。经过精制的柠檬草精油含有酮和烃类化合物，含量较高的有：2-十一酮(0.606%)、2-甲基-5-(1-甲基乙基)环己酮(1.83%)、（1S）-6,6-二甲基-二乙基二环-[3,1,1]-庚烷,(0.34%)、1,4-双亚甲基-环已烷,(0.176%)，3-丙基-环已基(0.1667%)。
关键词：柠檬草；固相微萃取 (SPME)；气相色谱/质谱联用 （GC-MS）；香气成分
Analysis of Cymbopogon citratus the aroma of using SPME/GC2MS
by solid phase microextraction SPME/GC-MS for the first time. The result showed that 25 total aroma constituents were detected in Cymbopogon citratus; most of them belonged to hydrocarbon and aldehydes, including those familiar aroma constituents in Cymbopogon citratus, such as beta-Phellandrene(34.34%), Caryophyllene(0.493%), Camphene(0.464),D-Limonene(0.126%),1R-alpha-Pinene(0.73%),citral-a(26.5%),3,7-dimethyl-2,6-Octadienal(26.63%), The results also indicated that the volatiles of Cymbopogon citratus mainly consisted of Ketones and hydrocarbons compounds after refining; and the content of the 2-Undecanone(0.606%), 5-methyl-2-(1-methy lethenyl)-Cyclohexanone(1.83%),(1S)-6,6-dimethyl-2-methylene-Bicyclo[3.1.1]-heptane(0.34%),1,4-bis(methylene)-Cyclohexane(0.176%)，3-propyl-Cyclohexene(0.1667%) were relatively more than the others in the Cymbopogon citratus.
Key words: Cymbopogon citratus; solid phase microextraction (SPME); gas chromatography-mass spectroscopy (GC-MS); aroma canstituent.
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