Minerals and Rare-earth Elements in Alpine Black Tea from Shouning, Fujian

XU Mengting; SHAO Shuxian; WEI Mingxiu; CHEN Qiang; CHEN Jing; CHEN Xiaolan; LIN Xinying; LUO Qin; YE Naixing

doi:10.19303/j.issn.1008-0384.2023.09.009

Volume 38 Issue 9

Sep. 2023

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Article Navigation > Fujian Journal of Agricultural Sciences > 2023 > 38(9): 1073-1081

XU M T, SHAO S X, WEI M X, et al. Minerals and Rare-earth Elements in Alpine Black Tea from Shouning, Fujian [J]. Fujian Journal of Agricultural Sciences，2023，38（9）：1073−1081 doi: 10.19303/j.issn.1008-0384.2023.09.009

Citation:

XU M T, SHAO S X, WEI M X, et al. Minerals and Rare-earth Elements in Alpine Black Tea from Shouning, Fujian [J]. Fujian Journal of Agricultural Sciences，2023，38（9）：1073−1081 doi: 10.19303/j.issn.1008-0384.2023.09.009

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Minerals and Rare-earth Elements in Alpine Black Tea from Shouning, Fujian

doi: 10.19303/j.issn.1008-0384.2023.09.009

1.
College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian　350002, China
2.
Shouning County Tea Industry Development Center, Shouning, Fujian　355500, China
3.
Tea College, Ningde Vocational and Technical College, Fu'an, Fujian　355000, China
4.
Institute of Agricultural Quality Standards and Testing Technology Research/Fujian Key Laboratory of Agro-products Quality & Safety, Fuzhou, Fujian　350003, China

Received Date: 2023-06-21
Rev Recd Date: 2023-07-29

Available Online: 2023-09-21

Publish Date: 2023-09-28

Abstract

Abstract

Objective Contents of minerals and rare-earth elements in the alpine black teas from Shouning, Fujian were analyzed for grade classification. Methods On 60 Jinmudan alpine black tea of various grades, sensory evaluation and chemical analysis were performed. A chemometric method was applied on the data to construct a grade discrimination model for the tea. Results Based on the analytical data, 15 minerals detected in the specimens were ranked by their contents as K＞Ca＞Mg＞Mn＞Al＞Fe＞Na＞Zn＞Cu＞Pb＞Sn＞Se＞As＞Cd＞Hg. Among them, K, Ca, Mg, and Mn were more abundant and accounted for 96.78% of the total. The rank on the 15 rare-earth elements was Ce＞La＞Y＞Nd＞Gd＞Pr＞Dy＞Er＞Yb＞Sm＞Eu＞Ho＞Lu＞Tb＞Tm, with Ce, La, Y, and Nd being the dominant at contribution rate of 82.44%. For constructing a grading model, 14 characteristic elements, including Cu, Al, Sn, Ce, Tm, Lu, Se, Mn, Dy, Ho, Gd, Tb, Er, and Yb, were selected by the analysis of variance (ANOVA) combined with receiver operating characteristic curve (ROC curve) (P＜0.05, AUC＞0.7). A discriminant model of multi-layer perceptual neural network with a discriminant rate of 90.48% on the training group and 94.44% on the test group was established. Conclusion K, Ca, Mg, Mn, and other minerals were richly found in the Shouning Jinmudan alpine black teas. The constructed multivariate statistical model based on the chemical composition could be used to classify the grades of the teas.
- Black tea,
- Jinmudan,
- minerals,
- rare-earth elements,
- ICP-MS,
- Shouning

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References(24)

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