Monitoring the authenticity of pu'er tea via chemometric analysis of multielements and stable isotopes. (October 2020)

• Record Type: Journal Article
• Authors: Liu, Hong-Lin; Zeng, Yi-Tao; Zhao, Xin; Ye, Yu-Long; Wang, Bei; Tong, Hua-Rong
• Is Part Of: Food research international. Volume 136(2020)
• Publication Date: 2020-10
• Subjects: Chemometrics -- ICP-MS -- ICP-OES -- Multi-element and stable isotope fingerprinting -- Production year -- Pu'er tea -- Quality control; Food -- Analysis -- Periodicals; Food industry and trade -- Periodicals; Food industry and trade -- Canada -- Periodicals; Food Technology -- Periodicals; Food -- Periodicals; Food-Processing Industry -- Periodicals; Aliments -- Industrie et commerce -- Périodiques; Aliments -- Industrie et commerce -- Canada -- Périodiques; Aliments -- Recherche -- Périodiques; Food industry and trade; Canada; Periodicals; Electronic journals; 664.005
• DOI: 10.1016/j.foodres.2020.109483
• Languages: English
• ISSNs: 0963-9969

Abstract

Graphical abstract: Highlights: First successful authenticating Pu'er tea in different production years based on multielements and stable isotopes. Clustering results of the HCA and PCA were worse than that of PLS-DA, BP-ANN, and LDA. Authentication performance of LDA and BP-ANN revealed best. Mn, 68 Zn, and 203 Tl were the markers. Abstract: 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 (R 2 X = 0.86, R 2 Y = 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, 68 Zn, and 203 Tl 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.