title: [Analysis of the volatile components in Minnan oolong tea by headspace solid phase microextraction coupled with comprehensive two-dimensional gas chromatography-time of flight mass spectrometry and the application in its variety identification].
abstract: A method to analyze the volatile components in Minnan oolong tea was developed based on headspace solid phase microextraction (HS-SPME) coupled with comprehensive two-dimensional gas chromatography-time of flight mass spectrometry (GC×GC-TOF MS). Volatile compounds of 48 oolong tea samples with different qualities and production seasons from five varieties (Tieguanyin, Huangjingui, Benshan, Maoxie and Meizhan) were extracted by HS-SPME and analyzed by GC×GC-TOF MS. More than 2 000 peaks were obtained from each sample, and 51 common compounds were tentatively identified by comparison with the standard mass spectrum databases, retention indices and structure spectra. The projection score of the common compounds obtained from principal component analysis ( PCA) had presented a straightforward classification trend for different oolong tea varieties. In addition, 9 compounds which had significant impact on the classification were selected by stepwise discriminate analysis, and used as variables to establish four discriminated functions by Fisher's discriminate analysis (FDA). The accuracy for the recognition of 48 samples was 97. 9%. The results had demonstrated the feasibility of the method to be used to discriminate the oolong tea varieties.
authors.forename: Quan
authors.initials: Q
authors.lastname: Cheng
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Shengyu
authors.initials: S
authors.lastname: Lu
authors.forename: Jinchang
authors.initials: J
authors.lastname: Lan
authors.forename: Jinbin
authors.initials: J
authors.lastname: Jiang
mesh_terms: D016002:Discriminant Analysis; D008401:Gas Chromatography-Mass Spectrometry; D052617:Solid Phase Microextraction; D013662:Tea / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000032:analysis*
chemical_list: D013662:Tea; D055549:Volatile Organic Compounds