期刊
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
卷 27, 期 1, 页码 95-101出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jfca.2012.06.001
关键词
Bioactive non-nutrients; Caffeine; Camellia sinensis; Catechins; Food analysis; Food composition; Food processing; Green tea; Hot water extraction; Microwave assisted extraction; Teabag; Theanine
资金
- Australian Government Department of Education, Employment and Workplace Relations (DEEWR)
The green tea (Camellia sinensis) catechins are strong antioxidants linked with potential health benefits. Based on previous studies, it was hypothesised that the typical household conditions for brewing green tea in a teabag - 200 mL freshly boiled water for 2-3 min, as per the manufacturers' instructions - were not sufficient to extract all the catechins and that a household microwave oven could be used to improve the extraction. The catechins and the two other main green tea components, caffeine and theanine, were monitored by H PLC. The typical household conditions only extracted 62% (61 mg/g tea), 76% (24 mg/g) and 80% (10 mg/g) of the catechins, caffeine and theanine, respectively, from the five varieties of teabags analysed. However, using microwave assisted extraction (MAE) by first brewing a teabag in 200 mL freshly boiled water for 0.5 min before irradiation for 1 min in a microwave oven (hot MAE), improved the extraction of the catechins and caffeine to 80% (80 mg/g) and 92% (29 mg/g), respectively, although the extraction of theanine was not affected. Therefore, the hot MAE technique could help maximise the extraction of the catechins for those who consume green tea for the potential health benefits of the catechins. (C) 2012 Elsevier Inc. All rights reserved.
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