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Subcritical water extraction of flavonol quercetin from onion skin

Title
Subcritical water extraction of flavonol quercetin from onion skin
Authors
Ko M.-J.Cheigh C.-I.Cho S.-W.Chung M.-S.
Ewha Authors
정명수조상우
SCOPUS Author ID
정명수scopus
Issue Date
2011
Journal Title
Journal of Food Engineering
ISSN
0260-8774JCR Link
Citation
vol. 102, no. 4, pp. 327 - 333
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Subcritical water could be an excellent alternative to organic solvent as a medium for extracting flavonol quercetin, due to its temperature-dependent selectivity, safety, efficiency of recovery, and lower cost. This study investigated the application of subcritical water extraction (SWE) of quercetin from onion skin and evaluated the effect of key operation conditions by varying the temperature (100-190 °C), extraction time (5-30 min), and mixture ratio of onion skin and diatomaceous earth (DE) (0.5:3.5-2:2) under high pressure (90-131 bar). The maximum yield of quercetin (16.29 ± 0.75 mg/g onion skin) was obtained at extraction temperature of 165 °C, extraction time of 15 min, mixture ratio of 1.5:2.5 for onion skin and DE. The SWE was compared with three conventional extraction methods in terms of the efficiency. The quercetin yield by SWE was over eight-, six-, and fourfold greater than those obtained using the ethanol, methanol, and water-at-boiling-point extraction methods, respectively. © 2010 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.jfoodeng.2010.09.008
Appears in Collections:
엘텍공과대학 > 식품공학전공 > Journal papers
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