Journal
FOOD RESEARCH INTERNATIONAL
Volume 136, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.foodres.2020.109483
Keywords
Chemometrics; ICP-MS; ICP-OES; Multi-element and stable isotope fingerprinting; Production year; Pu'er tea; Quality control
Categories
Funding
- Southwest University
- Chongqing University of Education in 2019
- Chongqing modern mountain characteristics efficient agricultural tea industry technical system [2019-6, 2018-6]
- Chongqing university innovation team construction plan [CXTDX201601040]
- Chongqing education commission [2015cgjwgz2001]
- Practical research on the development of high-quality biology elective courses in senior high school to cultivate students' innovative qualities [2016-CX-06]
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Mineral elements and stable isotopes combined with stoichiometric methods were used as a potential tool for first authenticating Chinese tea according to it's production year. A total of 86 mineral elements and stable isotope compositions were determined from the Xiangzhujing Pu'er tea in five different production years using ICP-MS and ICP-OES. On the basis of 78 statistically significant mineral elements and stable isotopes, HCA, PCA, PLS-DA, BP-ANN, and LDA were employed to build authentication models for predicting the Pu'er tea with different production years. The clustering results of the HCA and PCA were worse than that of PLS-DA, BP-ANN, and LDA. The PLS-DA model displayed a perfect model performance ((RX)-X-2 = 0.86, (RY)-Y-2 = 0.974, and Q(2) = 0.922). The authentication performance of LDA and BP-ANN revealed their 100% recognition sensitivity and prediction ability and was thus better than that of PLS-DA. Mn, Zn-68, and Tl-203 were the markers for enabling the successful authentication of Pu'er tea with different production years. This study contributes toward generalizing the use of mineral element and stable isotope fingerprinting combined with LDA and BP-ANN as a promising tool for authentication of tea worldwide.
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