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Food Chem

Title:		Use of headspace GC/MS combined with chemometric analysis to identify the geographic origins of black tea
Author(s):		Yun J; Cui C; Zhang S; Zhu J; Peng C; Cai H; Yang X; Hou R;
Address:		"State Key Laboratory of Tea Plant Biology and Utilization School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei 230036, China. College of Life Science and Health, Wuhan University of Science and Technology, Wuhan, China. School of Electrical Engineering, Yancheng Institute of Technology, Yancheng, China. State Key Laboratory of Tea Plant Biology and Utilization School of Tea and Food Science & Technology, Anhui Agricultural University, Hefei 230036, China. Electronic address: hry@ahau.edu.cn"
Journal Title:		Food Chem
Year:		2021
Volume:		20210509
Issue:
Page Number:		130033 -
DOI:		10.1016/j.foodchem.2021.130033
ISSN/ISBN:		1873-7072 (Electronic) 0308-8146 (Linking)
Abstract:		"Some black teas demand high market prices. Black tea samples (306) collected from 10 geographic origins, including China (Guxi, Likou, Jinzipai, Guichi, Dongzhi, Changning, Wuyishan, Shaowu), India (Darjeeling), and Sri Lanka (Kandy), were analyzed using headspace volatilization followed by GC/MS (HS-GC/MS). Forty-eight volatile compounds were identified. The aroma compounds were mainly identified as alcohols, aldehydes, ketones, and esters. Analysis of either full-spectrum data or 22 tea compounds shared among the samples with k-Nearest Neighbor (k-NN) and Random Forest (RF) models discriminated all origins at 100% using KNN and 95% with RF using either data set. The discrimination rates using 2 key aroma compounds (linalool and geraniol) by k-NN were 100% for nine origins, with the rate for Guxi area at 89%, because 3 samples were classified to Jinzipai. The findings support the use of HS-GC/MS combined with chemometrics as a tool to identify the origin of black tea"
Keywords:		Acyclic Monoterpenes/analysis Aldehydes/analysis China Esters/analysis Gas Chromatography-Mass Spectrometry/*methods India Odorants/analysis *Phylogeography Solid Phase Microextraction Sri Lanka Tea/*chemistry Volatile Organic Compounds/analysis Volatiliz;
Notes:		"MedlineYun, Jing Cui, Chuanjian Zhang, Shihua Zhu, Jiaji Peng, Chuanyi Cai, Huimei Yang, Xiaogen Hou, Ruyan eng England 2021/05/24 Food Chem. 2021 Oct 30; 360:130033. doi: 10.1016/j.foodchem.2021.130033. Epub 2021 May 9"