期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 62, 期 28, 页码 6828-6833出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf5012006
关键词
subcritical-water extraction; flavanols; epimerization; green tea leaves
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2013R1A1A2A10060325]
- National Research Foundation of Korea [2013R1A1A2A10060325] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The subcritical-water extraction (SWE) of six kinds of flavanols from green tea leaves and the effect of extraction conditions were investigated by varying the temperature and time. The maximum yield of total flavanols, 71.36 +/- 4.23 mg/g green tea leaves (mean +/- SD), was obtained under extraction temperature/time conditions of 150 degrees C/5 min. The efficiency of SWE for total flavanols was slightly higher than that of the conventional extraction solvents such as methanol and ethanol. The extraction of flavanols via SWE was specifically adequate for epimer structures such as catechin, catechin gallate, and gallocatechin gallate due to the epimerization of epicatechins. The extraction efficiency of epirners was increased at temperatures up to 170 degrees C, whereas that of epicatechins was decreased. Thus, most epicatechins were converted to epimers during SWE, leading to some flavanol destruction at high temperatures, except when a short extraction time of 5 min was used.
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