矿物元素分析判别绿茶产地来源研究

Determination of Geographical Origin of Green Teas Using Mineral Element Content

【目的】探讨矿物元素指纹分析判别茶叶产地来源的可行性,筛选出有效判别指标。【方法】采用ICP-AES法对来自湖北四大茶区35份茶样中的K、Ca、Mg、Mn等9种矿物元素进行了分析测定。【结果】不同茶区茶叶样品的元素含量有其各自的特征,主成分分析可将不同茶区的大多数样品正确区分。通过逐步判别分析筛选出6项可用于绿茶产地判别的矿物元素指标,依次为K、Ca、Mg、Mn、Fe和Mo,所建立的判别模型对样品整体检验判别率为100%。【结论】利用矿物元素可对来源于湖北不同茶区的绿茶进行有效判别。

[Objective] The objective of this study was to measure mineral element analysis for i- dentifying the geographical origin of tea and to select the effective indicators. [Method] The con- centrations of nine mineral elements（e, g. , K, Ca, Mg and Mn） in 35 green tea samples from four main production areas in the Hubei province were analyzed using inductively coupled plasma-atom- ic emission spectrometry （ICP-AES）. [Results] Element contents of teas from different regions were different. Most of the samples were classified correctly by principal component analysis （PCA）, 6 key variables （K, Ca, Mg, Mn, Fe and Mo） were identified by stepwise discriminant analysis. The discriminant model had a 100G correct classification. [Conclusion] Green tea sam- ples from different tea plantations in the Hubei can be classified correctly by mineral element analysis.