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Chemical Composition of Green Teas According to Processing Methods and Extraction Conditions  

Kim, Young-Kyung (Department of Food Science and Technology, Ewha Womans University)
Oh, Yoo-Jin (Tea Research, Food Research Institute, Amorepacific Corporation)
Chung, Jin-Oh (Tea Research, Food Research Institute, Amorepacific Corporation)
Lee, Sang-Jun (Tea Research, Food Research Institute, Amorepacific Corporation)
Kim, Kwang-Ok (Department of Food Science and Technology, Ewha Womans University)
Publication Information
Food Science and Biotechnology / v.18, no.5, 2009 , pp. 1212-1217 More about this Journal
Abstract
This study examined the influence of manufacturing processes and extraction conditions on the chemical compositions of green tea. Green tea samples grown in various areas (Korea, China, and Japan) and processed by 4 different methods (steaming, pan-firing, steaming and pan-firing, and heavy roasting after steaming and pan-firing) were collected for study. The chemical compositions of the green tea extracts and infusions were different according to their processing methods and extraction conditions, including catechins, caffeine, and free amino acids contents. In all samples analyzed, (-)-epigallocatechin gallate (EGCG), (-)-epigallocatechin (EGC), and theanine were determined as the major catechins and free amino acid, respectively. Studies of samples grown in the same area (Jeju; Korea) showed that there were significant differences in the concentrations of catechins and caffeine in extract and infusion according to the processing methods. These results indicate that processing methods influenced the chemical compositions of the green tea extracts and infusions.
Keywords
green tea; chemical composition; processing method; extraction condition;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
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