色谱 ›› 2019, Vol. 37 ›› Issue (3): 325-330.DOI: 10.3724/SP.J.1123.2018.10017

• 研究论文 • 上一篇    下一篇

基于香气成分气相色谱-质谱指纹图谱的判别分析和相似度评价用于绿茶等级差异研究

龙立梅, 宋沙沙, 曹学丽   

  1. 北京食品营养与人类健康高精尖创新中心, 北京工商大学食品学院, 北京市食品风味化学重点实验室, 北京 100048
  • 收稿日期:2018-10-23 出版日期:2019-03-08 发布日期:2015-01-21
  • 通讯作者: 曹学丽.E-mail:caoxl@th.btbu.edu.cn.
  • 基金资助:

    国家质量监督检验检疫总局公益性行业科研专项(201310230).

Discriminant analysis and similarity evaluation of gas chromatography-mass spectrometry fingerprints of aroma components in green tea grading

LONG Limei, SONG Shasha, CAO Xueli   

  1. Beijing Advanced Innovation Center for Food Nutrition and Human Health, School of Food and Chemical Engineering, Beijing Key Lab of Food Flavor Chemistry, Beijing Technology and Business University, Beijing 100048, China
  • Received:2018-10-23 Online:2019-03-08 Published:2015-01-21
  • Supported by:

    General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) Public Research Project (No. 201310230).

摘要:

该文以研究指纹图谱在绿茶等级判别方面应用的可行性为目的。以信阳毛尖茶为研究对象,以茶汤香气成分为研究目标,采用顶空固相微萃取与气相色谱-质谱联用技术,筛选其香气特征成分,建立不同等级信阳毛尖茶香气成分GC-MS指纹图谱。发现运用判别分析法可以对2个系列7个等级41个信阳毛尖茶样进行很好的等级区分;通过不同等级色谱指纹图谱的相似度计算发现,相似度与茶样等级之间具有较好的相关性,尤其是对于品质较好的茶样,这种相关性更好。表明运用判别分析法和相似度计算方法能够反映绿茶等级之间的差异性,且基于相似度评价的方法具有客观量化的特征。

关键词: 等级相关性, 判别分析, 气相色谱-质谱指纹图谱, 相似度计算, 香气成分, 信阳毛尖茶

Abstract:

Two series of 41 Xinyang Maojian tea samples were investigated and the gas chromatography-mass spectrometry (GC-MS) fingerprints of their aroma components of seven different grades were established using headspace solid-phase micro extraction (HS-SPME) and GC-MS. Based on the 23 selected characteristic aroma components, the samples could be classified into seven different groups through discriminant analysis with four and three groups in two separate series. Six fingerprint similarity calculation methods that reflect the differences between grades of tea to different extents were employed, and the new improved extent similarity method was demonstrated to be the best among them. The results for the similarity evaluation displayed good correlation with the actual grades, especially for the series of tea of higher qualities, and the differences between the different grades of teas could be quantified.

Key words: aroma components, discriminant analysis, gas chromatography-mass spectrometry (GC-MS) fingerprints, grading correlation, similarity evaluation, Xinyang Maojian tea

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