基于PCA和聚类分析方法对云南不同茶区晒青毛茶生化成分分析

Research for Biochemical Components of Sun-dried Green Tea in Different Tea Areas of Yunnan by Using PCA and Cluster Analysis Methods

为研究云南不同茶区28份晒青毛茶生化成分以及类群之间的差异性,采用常规法和高效液相色谱法分析了28份晒青毛茶的主要生化成分,利用主成分分析法和聚类分析法,对28份晒青毛茶进行类群划分。结果表明,儿茶素、表儿茶素、表没食子儿茶素作为28份晒青毛茶样的主要生化成分,其变异系数分别为56.88%、36.41%和49.52%,多样性指数分别为1.91、1.91和1.97,说明供试样在非酯型儿茶素组成及表现上更加丰富。将供试样划分为6个类群,并且类群之间生化成分含量存在一定差异。

This paper was to study the biochemical components and groups differences among 28 tea samples from different tea regions in yunnan.The biochemical components of 28 tea samples were analyzed by conventional method and high performance liquid chromatography.Principal component analysis and cluster analysis were used to classify 28 tea samples.The results showed that the mainly biochemical components of 28 tea samples,which included catechinepicatechin and epigallocatechin had large variation coefficients,56.88%,36.41%and 49.52%,respectively.The diversity index was 1.91,1.91 and 1.97,respectively.All above explained the characteristics of the samples in biochemical components were more abundant in the composition and performance of non-galloylatedcatechins.The samples were divided into 6 groups by cluster analysis,there were some differences in the content of biochemical components between the groups.