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http://dx.doi.org/10.3746/jkfn.2003.32.5.739

Inhibitory Effect of Hot-Water Extract of Paeonia japonica on Oxidative Stress and Identification of Its Active Components  

Jeong, Ill-Yun (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Lee, Joo-Sang (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Oh, Heon (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Jung, U-Hee (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Park, Hae-Ran (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Jo, Sung-Kee (Radiation Food Technology and Bioscience Team, Korea Atomic Energy Research Institute)
Publication Information
Journal of the Korean Society of Food Science and Nutrition / v.32, no.5, 2003 , pp. 739-744 More about this Journal
Abstract
This study was carried out to investigate the antioxidative activity and to identify the active components of hot-water extract of Paeoniajaponica (PJ), which was a main ingredient of a herb mixture preparation recently established as a potent candidate of radioprotector in our laboratory. The water extract was fractionated with CHCl$_3$, EtOAc and n-BuOH. The extract and its fractions showed very low activity in hydroxyl radical scavenging test. In lipid peroxidation test, the extract, EtOAc and water fractions showed moderate inhibition with the ratio above 50%. In DPPH radical scavenging test, the extract, EtOAc and water fraction showed high activity with the ratio above 80%, especially. EtOAc fraction scavenged the radicals as much as synthetic antioxidant (BHA), even at low concentration. It is suggested that mai or partition for antioxidative activity of Paeonia japonica was EtOAc fraction. Subsequently, two active compounds (PJE021-1 and JE024-1) from EtOAc fraction were isolated by using MCI gel and silica gel column chromatography The two compounds inhibited remarkedly the $H_2O$$_2$-induced DNA damage in human peripheral blood lymphocytes, measured by single-cell gel electrophoresis (SCGE). PJE021-1 protected the cells to almost negative control level, dose-dependently. PJE024-1 exhibited a potent inhibition with the ratio of 71% at even low concentration (0.5 $\mu\textrm{g}$/$m\ell$). Finally, their chemical structures were identified as gallic acid (PJE021-1) and (+)-catechin (PJE024-1), respectively, on the basis of the speculation of spectral and physical data.
Keywords
Paeonia japonica; gallic acid; (+)-catechin; antioxidative activity; SCGE;
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