[Scavenging effects of Astragalus and Gynostemma pentaphyllum with its product on O2-. and .OH].

The scavenging effects of Astragalus and Gynostemma pentaphyllum with its products on O2-. (produced by the autoxidation of pyrogallol) and .OH (generated from the Fenton reaction) were investigated by electrochemical method. The results showed that they could scavenge the active oxygen free radicals effectively, however, their scavenge ability was different for O2-. and .OH. The inhibitory effect of Ginsenoside Rb1 and Astragaloside IV on O2-. and .OH was the most strongest. Their IC50 values were calculated respectively. The scavenging ability of Astragalus samples on O2-. was in the order of the following: astragaloside IV > crude radix astragali > mongolia radix astragali > hebei radix astragali > radix astragali > radix astragali mixfry with honey; and the scavenging effect on .OH was: astragaloside IV > hebei radix astragali > radix astragali mix-fry with honey > radix astragali > crude radix astragali > mongolia radix astragali. The scavenging activity of gynostemma samples on O2-. was: ginsenoside Rb1 > gynostemma jujube tea > tabellae Jiaogulanosidi > anguo market gynostemma > hebei qingxian gynostemma; while on .OH, the inhibitory ability was: ginsenoside Rb1 > gynostemma jujube tea > anguo market gynostemma > hebei qingxian gynostemma > tabellae Jiaogulanosidi.