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Optimization of Subcritical Water Extraction of Flavanols from Green Tea Leaves

Title
Optimization of Subcritical Water Extraction of Flavanols from Green Tea Leaves
Authors
Ko, Min-JungCheigh, Chan-IckChung, Myong-Soo
Ewha Authors
정명수
SCOPUS Author ID
정명수scopus
Issue Date
2014
Journal Title
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
ISSN
0021-8561JCR Link1520-5118JCR Link
Citation
vol. 62, no. 28, pp. 6828 - 6833
Keywords
subcritical-water extractionflavanolsepimerizationgreen tea leaves
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
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.
DOI
10.1021/jf5012006
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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