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    顶空固相微萃取-气相色谱-质谱法分析芝麻香精的挥发性成分

    GC-MS Analysis of Volatile Components of Sesame Essence with Head-Space Solid Phase Micro-extraction

    • 摘要: 采用顶空固相微萃取-气相色谱-质谱法分离和鉴定芝麻香精中挥发性成分,用归一化法测定其相对含量。为使固相微萃取达到更高的效率,选用50/30 μm DVB-CAR-PDMS的固相萃取头,萃取温度及时间为60 ℃和1 h。两种芝麻香精中分别鉴定出31和28种香气成分,其中含量较高的几类物质分别为吡嗪类、呋喃类、吡啶类、酮类和酚类物质。1号香精中的主要香气化合物为:1,6-二氢-咪唑并[4,5-d]咪唑、甲基吡嗪、3,5-二甲基苯酚、糠醛、2,6-二甲基-4-氨基吡啶和5-甲基-2-呋喃甲醛。2号香精中的主要香气化合物为:2,3-二甲基吡嗪、2-糠酸糠酯、4-氨基吡啶、3,5-二甲基苯酚、乙酰基吡嗪和糠醛。

       

      Abstract: Volatile components in sesame essence were separated and identified by headspace solid phase micro-extraction (HS-SPME) and GC-MS, and their relative contents (in %) were found by the method of normalization. To attain a higher efficiency in HS-SPME, 50/30 μm DVB-CAR-PDMS fiber as coating was selected for micro-extractor and the extraction was carried out at 60 ℃ for 1 h. Thirty-one compounds in sesame essence 1# and 28 compounds in sesame essence 2# were identified among which main compounds were pyrazine, furan, pyridine, ketones and phenols. The major compounds found in sesame essence 1# were as follows: 1,6-dihydro-imidazo[4,5-d] imidazole, methyl-pyrazine, 3,5-dimethyl-phenol, furfural, 2,6-dimethyl-4-pyridinamine and 5-methyl-2-furancarboxaldehyde; the major compounds found in sesame essence 2# were as follows: 2,3-dimethyl-pyrazine, 2-furfurylthiol, 4-pyridinamine, 3,5-dimethyl-phenol, acetylpyrazine and furfural, respectively.

       

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