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논문 기본 정보

자료유형
학술저널
저자정보
Jung, Sung-Je (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University) Kim, Dong-Hyun (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University) Hong, Yoon-Hee (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University) Lee, Jin-Hee (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University) Song, Hyo-Nam (Department of Oriental Medical Food and Nutrition, Semyung University) Rho, Young-Deok (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University) Baek, Nam-In (Graduate School of Biotechnology & Plant Metabolism Research Center, Kyung Hee University)
저널정보
대한약학회 Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea Archives of pharmacal research : a publication of the Pharmaceutical Society of Korea 제30권 제2호
발행연도
2007.1
수록면
146 - 150 (5page)

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Antioxidant flavonoids have beer isolated from the flower of Rhododendron yedoense var. poukhanense. One new flavonoid and three known flavonoids, quercetin-5-O-${\beta}$-glucopyranoside (1), quercetin (3), and quercitrin (4), were isolated from the butanol and ethyl acetate extracts of the plant. The new flavonoid was identified as myricitrin-5-methyl ether (2). The isolation of these flavonoids from this plant, for the first time, is a valuable finding. The flavonoids were evaluated for their antioxidant activities using 1,1-diphenyl-2-picrylhydrazyl free radical (DPPH), TBARS (thiobarbituric acid reactive substance) and superoxide anion radical (O$_2$) in the xanthine/xanthine oxidase assay system. In the DPPH scavenging assay, the IC$_{50}$ values were 4.5${\pm}$0.48 ${\mu}$M for compound 2 and 9.7${\pm}$0.29 ${\mu}$M for compound 3, which showed an antioxidant activity approximately 1.5${\sim}$2 times higher than the antioxidant activity of ${\alpha}$-tocopherol (9.8${\pm}$0.94 ${\mu}$M). Additionally, the antioxidant activities of myricitrin-5-methyl ether (2) (IC$_{50}$ = 1.7${\pm}$0.22 ${\mu}$M) and quercetrin (4) (IC$_{50}$ = 1.9${\pm}$0.63 ${\mu}$M) were higher than that of L-ascorbic acid (IC$_{50}$ = 7.4${\pm}$0.63 ${\mu}$M) when evaluated using a TBARS assay. Compound 2 showed high activity in both the inhibition of xanthine oxidase (1.1${\pm}$0.21 ${\mu}$M) and in the activation of superoxide scavenging.

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