Effect of geographical origins and pile-fermentation on the multi-element profiles of ripen Pu-erh tea revealed by comprehensive elemental fingerprinting

Zhu, Jiayi; Chen, Le; Chen, Yue; Rong, Yuting; Jiang, Yongwen; Liu, Fuqiao; Zhou, Qinghua; Wei, Xuehong; Yuan, Haibo; Zhang, J. F.; Li, Jia

doi:10.1016/j.foodcont.2023.109978

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…At the same time, compared with the previous mineral elements of Pu-erh tea, especially the Mg values of Pu-erh tea samples with different geographical origins ranged from 1797.00 to 2273.50 mg/kg, agreeing with a previous report in which Mn values for Pu-erh tea varied between 381.65 to 878.15 mg/kg [39]. For Pu-erh tea from Yunnan Province, the total amount of Eu (0.010 ± 0.002 µg/g) was close to a previous report in which the content of Eu was 6.49 ± 2.30 µg/kg, and the Yb content (0.019 ± 0.006 µg/g) was also similar with the previous report, with the Yb content was 12.25 ± 4.66 µg/kg [40]. Furthermore, the mineral element content (e.g., Zn) in Pu-erh tea is also influenced by the age of the tea trees.…”

Section: Discussionsupporting

confidence: 89%

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

Chen,

Liao,

Qian

et al. 2024

Foods

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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 δ13C, δ15N values and 25 elements were determined and analyzed. The results showed that δ13C, δ15N, 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 (δ13C, δ15N, 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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Section: Discussionsupporting

confidence: 89%