中文摘要：

采用固相微萃取顶空进样技术和GC—MS（气相色谱-质谱）联用技术对金桂、银桂鲜花中的挥发性化学成分进行了对比分析，优选了金桂、银桂香味的采样方法和分析条件（萃取头极性、萃取温度、时间等）。结果表明：利用65μm PDMS／DVB萃取头萃取后得到的色谱峰较多，两种花中各检出34种化合物。比较发现金桂、银桂鲜花的挥发性物质不但化学组成不同，金桂中特有如β-环柠檬醛，而银桂中特有α，β-二氢-α-紫罗兰酮。而且其相同成分的含量亦有明显的差异，两者含量相差5倍以上，如α-紫罗兰酮和反-β-紫罗兰酮在金桂中的含量为1．74％和1．44％，而在银桂中的含量为0．20％和0．26％；而芳樟醇氧化物等在银桂中的含量明显高于它们在金桂中的含量，两者含量相差5倍以上。

英文摘要：

The chemical constituents from the fresh flowers of Osmanthus fragrans var. thunbergii and O. fragrans var. latifolius were analyzed by GC -MS （gas chromatography-mass spectrometry） with headspace SPME （solld-phase micro-extraction）. The optimum sampling conditions, e.g. , the polarity of the fiber coating, the temperature, the method and the time of sampling in the SPME were selected. A total of 34 compounds were identified respectively in the flowers of the two species with a 65μm polydimethylsiloxane and divinylbenzene （PDMS/DVB） SPME fiber assembly. Both quantitive and qualitative differences were found among the chemical compositions of O. fragrans vat. thunbergii and O. fragrans vat. latifolius. For example the proprietary component of O. fragrans var. thunbergii was á-cyclocitral but the proprietary one of O. fragrans vat. latifolius was à,á-dihydro-à-ionone. For the same compositions of O. fragrans vat. thunbergii and O. fragrans vat. latifolius, the difference of the contents was more than 5 times. For example, the contents of à-Ionone and Trans-á-Ionone in O. fragrans vat. thunbergii were 1.7% and 1.44% but in O. fragrans vat. latifolius they were 0.20% and 0. 26%. However the content of Linalool oxide in O. fragrans vat. latifolius was higher than that in O. fragrans vat. thunbergii.