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Published on: May 26, 2023
Evaluation of key taste components in Huangjin green tea based on electronic tongue technology
Jiezhong Zan1, Wenxue Chen1, Haibo Yuan1
1Tea Research Institute, China Academy of Agricultural Sciences, Key Laboratory of Tea Biology and Resource Utilization, Ministry of Agriculture, Hangzhou 310008, China.
Abstract:
A random forest algorithm combined with correlation analysis, was employed to identify key taste compounds in Huangjin green tea by using an electronic tongue. A total of 45 commercial Huangjin green teas were analysed for their amino acids, catechins, gallic acid, and caffeine using an amino acid analyser and HPLC. In this study, taste compounds of 30 were quantified, and 16 of these compounds exhibited taste activity values greater than 1 in the tea samples, including 6 amino acids, 8 catechins, as well as gallic acid and caffeine. Among these compounds, 5 compounds showed relatively high importance and strong correlations (P < 0.05) with the response of electronic tongue; specific for theanine, glutamic acid, lysine, gallocatechin, and catechin. A taste reconstruction experiment further confirmed that these 5 compounds significantly contributed to the overall taste profile, particularly enhancing the umami flavour.
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