Effects of Geographical Origin and Tree Age on the Stable Isotopes and Multi-Elements of Pu-erh Tea

文献类型： 外文期刊

第一作者： Chen, Ming-Ming

作者： Chen, Ming-Ming;Liao, Qiu-Hong;Zou, Hai-Dan;Li, Yan-Long;Song, Yan;Xia, Yu;Liu, Yi;Liu, Hong-Yan;Chen, Ming-Ming;Qian, Li-Li;Liu, Ze-Long

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关键词： geographical origin; pu-erh tea; tree ages; mineral elements; stable isotope

期刊名称：FOODS （ 影响因子：5.2； 五年影响因子：5.5 ）

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年卷期： 2024 年 13 卷 3 期

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收录情况： SCI

摘要： Pu-erh tea is a famous tea worldwide, and identification of the geographical origin of Pu-erh tea can not only protect manufacture's interests, but also boost consumers' confidence. However, tree age may also influence the fingerprints of Pu-erh tea. In order to study the effects of the geographical origin and tree age on the interactions of stable isotopes and multi-elements of Pu-erh tea, 53 Pu-erh tea leaves with three different age stages from three different areas in Yunnan were collected in 2023. The delta C-13, delta N-15 values and 25 elements were determined and analyzed. The results showed that delta C-13, delta N-15, Mg, Mn, Fe, Cu, Zn, Rb, Sr, Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu had significant differences among different geographical origins (p < 0.05). Mn content was significantly influenced by region and tree age interaction. Based on multi-way analysis of variance, principal component analysis and step-wised discriminant analysis, 24 parameters were found to be closely related to the geographical origin rather than tree age, and the geographical origin of Pu-erh tea can be 100.0% discriminated in cross-validation with six parameters (delta C-13, delta N-15, Mn, Mg, La, and Tb). The study could provide references for the establishment of a database for the traceability of Pu-erh tea, and even the identification of tea sample regions with different tree ages.

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