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http://dx.doi.org/10.3746/jkfn.2010.39.3.399

Extraction Conditions of Radical Scavenging Caffeoylquinic Acids from Gomchui (Ligularia fischeri) Tea  

Kim, Sang-Min (Natural Product Research Center, KIST Gangneung Institute)
Kang, Suk-Woo (Natural Product Research Center, KIST Gangneung Institute)
Um, Byung-Hun (Natural Product Research Center, KIST Gangneung Institute)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.39, no.3, 2010 , pp. 399-405 More about this Journal
Abstract
After Gomchui tea was prepared from leaves of Ligularia fischeri (Ledeb.) Turcz by blanching method, the antioxidant activity of major compounds in Gomchui tea was assessed. On-line HPLC-ABTS analysis revealed that caffeoylquinic acids (chlorogenic acids), such as 5-O-caffeoylquinic acid (5-CQA), 3,4-di-O-caffeoylquinic acid (3,4-DCQA), 3,5-di-O-caffeoylquinic acid (3,5-DCQA) and 4,5-di-O-caffeoylquinic acid (4,5-DCQA), were the major antioxidant compounds in Gomchui tea. The extraction efficiency of these compounds were examined in the various conditions such as extraction temperature, time and solvent. The results demonstrated that the extraction amount with water increased in proportion to extraction time (1~10 min) and temperature ($8{\sim}80^{\circ}C$). These active compounds were also extracted with water even at $8^{\circ}C$ (60% of $80^{\circ}C$), indicating that water is very good extraction solvent for extraction of these antioxidant constituents. However, the extraction efficiency of these compounds decreased when ethanol percentage in water increased. The extraction efficiency between Gomchui powder (no blanching) and tea was significantly different, and 60% of total antioxidant compounds in tea was removed from fresh leaves into water in blanching process, especially 3,5-DCQA (over 90%). Meanwhile, the sonication method didn't affect the extraction of these compounds in all solvents. These results suggest that Gomchui tea can be a good candidate for the tea beneficial to human health.
Keywords
antioxidant compounds; caffeoylquinic acids; Ligularia fischeri (Ledeb.) Turcz.; tea;
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Times Cited By KSCI : 10  (Citation Analysis)
Times Cited By SCOPUS : 1
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