ESR Study on the Structure and Hydroxyl Radical-Scavenging Activity Relationships of Ginsenosides Isolated from Panax ginseng C. A. MEYER(Pharmacognosy)

概要

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Ginsenosides have been regarded as the main active components of Panax ginseng C. A. MEYER, and the antioxidant activity of ginsenosides in vivo is well described. However, there has been virtually no report describing the direct free radical-scavenging activities of ginsenosides through the long history of ginseng research. The hydroxyl radical (・OH)-scavenging activity test using an electron spin resonance spectrometer (ESR) is suggested to be the most appropriate to measure the antioxidant activities of ginsenosides. Therefore, we investigated the ・OH-scavenging and ferrous metal ion-chelating activities of several ginsenosides of Panax ginseng using ESR for the identification of active ginsenosides and its structure and activity relationships. As a result, 20(S)-Rg_3 showed the strongest activity, and the next were in the decreasing order of Rb_1, Rg_1, Rc, Rb_2, and Rd when dissolved with water. The ・OH-scavenging activities of ginsenosides were related to the ferrous metal ion-chelating activities of their aglycone, 20(S)-protopanaxadiol. In addition, the ferrous metal ion-chelating activities of ginsenosides were thought to be influenced by their types of hydrophilic sugar moieties.
社団法人日本薬学会の論文
2007-05-01