摘要
目的分析茯砖茶和千两茶品质成分的差异,为茯砖茶和千两茶品质鉴定和差异鉴别提供依据。方法以44个品质成分为指标并结合正交偏最小二乘判别分析法(orthogonal partial least squares discriminant analysis,OPLS-DA)分析,选取VIP(variable importance in projection)值大于1且具有显著差异的品质成分作为特征性差异成分。结果茯砖茶中除草酸外,其余各主要成分含量均高于千两茶。经OPLS-DA共识别出9种VIP值大于1的差异成分,其中水浸出物、茶多酚、咖啡碱、简单儿茶素和儿茶素为标志性差异品质成分。结论采用OPLS-DA分析茶叶样品品质成分,既可以对茯砖茶和千两茶进行鉴别区分,又可以筛选出两种茶类差异品质成分。
Objective To analyze the difference in the quality components of Fuzhuan tea and Qian-liang tea in order to provide basis for the identification of quality and difference of Fuzhuan tea and Qian-liang tea. Methods Forty-four quality components as indicators and combined with orthogonal partial least squares discriminant analysis(OPLS-DA) was used, the quality components of variable importance in projection(VIP) value greater than 1 and significant difference were selected as characteristic differences. Results Besides oxalic acid, the content of the other main components in Fuzhuan tea was higher than Qian-liang tea. According to the OPLS-DA consensus, there were 9 different types of VIP values greater than 1, including water extract, tea polyphenol, caffeine, simple catechins, and catechins as the signature difference of quality components. Conclusion OPLS-DA can be used to analyze the quality components of tea samples, which not only can distinguish the Fuzhuan tea and Qian-liang tea, but also can screen out the difference quality components of them.
出处
《食品安全质量检测学报》
CAS
2017年第11期4382-4387,共6页
Journal of Food Safety and Quality
基金
湖南省教育厅科学研究项目(15C0670)~~
关键词
茯砖茶
千两茶
正交偏最小二乘判别分析法
品质成分
差异
Fuzhuan tea
Qian-liang tea
orthogonal partial least squares discriminant analysis
qualitycomponents
difference