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广藿香浸膏的分子蒸馏分离-全二维气相色谱/飞行时间质谱法分析
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摘要
应用全二维气相色谱/飞行时间质谱(GC×GC-TOFMS)分析广藿香浸膏的挥发性成分,采用超临界CO2流体萃取获得广藿香浸膏,浸膏经分子蒸馏仪40℃蒸馏分离,所得的轻馏分经GC×GC-TOFMS分析,通过TOFMS谱库(自建谱库和NIST谱库)检索对照,结合包含结构信息的二维谱图以及人工质谱图解析、丰度比比对等定性手段,采用色谱峰面积归一化法计算各化学成分的相对含量。结果:分析得到匹配度大于750的组分有323个,含量占总量的89.45%,其中酮类67个,醇类52个,烯类40个,酸类37个,烷类36个,酯类34个,醛类17个,其它类40个。相对含量大于0.1%的组分69个,其中相对含量大于1%的组分11个,以广藿香酮含量最高,为21.75%,其次是广藿香醇、叶绿醇、异冰片醇、α-松油醇、γ-榄香烯、α-愈创木烯等。
A method was developed to analyze the volatile organic compounds(VOCs) in patchouli extract by Comprehensive Two-Dimensional Gas Chromatography/Time-of-Flight Mass Spectrometry(GC×GC-TOFMS). Patchouli sample was pretreated with Supercritical CO_2 fluid extraction and molecular distillation at 40 ℃, light distillates were detected by GC×GC-TOFMS. Columns with different polarity and selectivity were selected, Rxi-5sil MS is selected as fist dimension and combined with column of increasing polarity in the second dimension such as Rtx-200. Auto date processing by TOFMS software combined with mass spectrum analysis and ion ratio was used to identify the compounds. The result showed that 323 constituents were identified with similarity more than 750 in the spectrum, accounting for about 89.16% percent of the whole peak area, including 67 ketones,52 alcohols, 40 alkenes, 37 acids, 36 alkanes, 34 ethers, 17 aldehydes and 40 others. There were 11 compounds with area% above 1%, Pogostone(21.75%) and patchouli alcohol(18.94%) were the main constituents in patchouli extract.
引文
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