为揭示自然条件下桂花Osmanthus fragrans开花进程中挥发性有机化合物(VOCs)释放动态变化,采用动态顶空气体循环采集法与热脱附-气相色谱-质谱(TDS-GC-MS)联用技术,选择金桂(Luteus group),银桂(Albus group),丹桂(Aurantiacus group)和四季桂(Asiaticus group)各1个品种进行开花进程所释放的VOCs成分收集测定.结果表明:4个桂花品种VOCs释放量依次为四季桂(1704.56)>银桂(1675.26)>金桂(1383.48)>丹桂(1062.76),均为单峰曲线,盛花期达到最大值;丹桂释放VOCs种类最多;4个桂花品种盛花期释放的VOCs主要是萜烯类,含量均大于63.0%,还有烃类、 醛类、 醇类、 酮类、 酯类及芳香族类化合物.其中金桂VOCs中主要成分为β-紫罗兰酮、 萜品醇,银桂主要为β-紫罗兰酮、 芳樟醇,丹桂主要为β-蒎烯、 乙酸-3-己烯酯,四季桂主要为萜品醇、 β-紫罗兰酮.图2表4参35%To reveal dynamic changes of the volatile organic compounds (VOCs) released in the flowering pro-cess of Osmanthus fragrans, the composition and content of flower VOCs in the four groups of cultivars (Lutens graup, Albus group, Aurantiacus group and Asiaticus group ) were analyzed under near-natural conditions using the dynamic headspace air-circulation method and the thermal desorption system/gas chromatography/mass spectrometer (TDS-GC-MS) technique. Results of the four groups listed in descending order towards VOCs re-lease were as follows:Asiaticus group(1704.56)>Albus group(1675.26)>Luteus group(1383.48)>Auran-tiacus group (1062.76). The VOCs release of four groups had single-peak-curves. During the full bloom stage, the Aurantiacus group of cultivar released the most kinds of VOCs. More than 63% of the VOCs in the four groups was terpene, and the left contained hydrocarbons, aldehydes, alcohols, ketones, esters, and aromatic compounds. Major VOCs in each group of cultivar were as follows: mostly β-ionone and terpineol in Luteus group; mainly β-ionone and linalool in Albus group; mostly β-pinene and acetate-3-hexen-1-ol in Aurantiacus group;and mostly terpineol andβ-ionone in Asiaticus groups. [Ch, 2 fig. 4 tab. 35 ref.]
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