普洱生茶是以云南大叶种晒青毛茶为原料加工而成,由于加工中原料拼配不同,普洱生茶又可以分为许多花色品种,目前不同花色品种的鉴别主要依据感官审评.为了实现对不同品种生茶进行量化鉴别,应用高效液相色谱技术,从图谱的整体性出发,采用系统聚类和主成分分析等方法对色谱图进行综合分析,建立了普洱生茶(7542)数字化指纹图谱和特征指纹图谱.通过比较图谱间相关系数、夹角余弦和重叠率等多种方式,实现了对7542与8542、8582和甲沱等生茶鉴别,这为普洱茶鉴别和质量控制提供一种量化的方法.%Pu'er raw tea was processed by sun dried green tea from Yunnan province.Due to the variety of green tea from different regions,Pu'er raw tea can be divided into many kinds and evaluation was sole rely on sensory evaluation now.Pu'er raw tea (7542) digital fingerprint and the characteristic fingerprint were established by high performance liquid chromatography(HPLC) to quantitatively identified different varieties of teas.System clustering and principal component analysis method were used to make a comprehensive analysis of chromatogram for the overall pattern.Three tea including 7542,8542,8582 and a Tuo tea was distinguished through the comparison of correlation coefficient,cosine of the angle and the overlap rate.It provides a quantitative method to distinguish different varieties teas and a way of quality control.
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