The essential oil from the leaves of S. photeinocarpum was obtained by steam distillation , the constituents and constructures of the obtained essential oil were analyzed and identified by GC-MS, and their relativee contents were deternined by peak area normalization. Results showed that the total of 151 peaks were detected and 138 compounda were identified . accounting for 100 ％ of the essential oi1. A large amount of chemical components were found in the easential oil from leavea of S. photeinocarpum , which contained alcohol , aldehydea . alkyl . esters , ene , ketone and aetber. etc. The main compounds were ( E) -2-Hexen-1 -ol ( 45 . 24 ％ ) . ( Z) -3-Hexen-1 -ol (41. 0 ％ ) , 2H-7-methoxy-2 ,2-dimethyl-1-Benzopyran ( 1. 49 ％ ) , Tetradecanal (0. 97 ％ ) , Hexanal (0. 97 ％ ) , Nonanal (0. 88 ％ ) , Cyclopentanol (0. 61 ％ ) and 4-t-Butyl-2-( 1-methyl-2-nitroethyl) cyclohexanone (0. 57 ％ ) , etc. The 8 major components accounted for 91. 74 ％ of the total relative content of the volatile oil , ( E) -2-Hexen-1 -ol and ( Z) -3-Hexen-1 -ol were two chemicals of higher relative content , which were important components in the production of food apice and coxmetica essence.%采用水蒸气冷凝法提取少花龙葵叶的挥发油,运用毛细管气相色谱-质谱联用技术结合计算机检索对挥发油进行成分分离、分析和鉴定,用气相色谱面积归一化法测定了各组分的相对含量(%).结果表明:经毛细管色谱分离出151个峰,共确认了其中138种化合物,所鉴定的组分占挥发油总量的100%.少花龙葵叶挥发油的化合物种类丰富,包括包括醇、醛、烷、酯、烯、酮及醚类等成分.少花龙葵挥发油的主要成分(相对含量＞0.5%)为(E)-2-己烯醇(45.25%),(Z)-3-己烯醇(41.0%),7-甲氧基-2,2-二甲基-二氢-1-苯并吡喃(1.49%),十四醛(0.97%),己醛(0.97%),壬醛(0.88%),环戊醇(0.61%)及4-丁基-2-(1-甲基-2-硝基乙基)环己酮(0.57%)等,这8种主要成分占总挥发油相对含量的91.74%;其中含量较高的(E)-2-己烯醇与(Z)-3-己烯醇2种物质是生产食品香料和化妆品香精的重要成分.
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