title: Antioxidative and free radical scavenging effects of ecdysteroids from Serratula strangulata.
abstract: The antioxidative and free radical scavenging effects of four ecdysteroids, 20-hydroxyecdysone (E1), 25-deoxy-11,20-dihydroxyecdysone (E2), 24-(2-hydroxyethyl)-20-hydroxyecdysone (E3), and 20-hydroxyecdysone-20,22-monoacetonide (E4), isolated from the Chinese herb Serratula strangulata have been investigated in vitro. These ecdysteroids could protect human erythrocytes against oxidative hemolysis induced by a water-soluble azo initiator 2,2'-azobis(2-amidinopropane hydrochloride) (AAPH). They could also inhibit the peroxidation of rat liver microsomes induced by hydroxyl radicals, as monitored by the formation of thiobarbituric acid reactive substances (TBARS), and prevent radical-induced decrease of membrane fluidity as determined by fluorescence polarization. They reacted with galvinoxyl radicals in homogeneous solution, and the pseudo-first-order rate constants were determined spectrophotometrically by following the disappearance of galvinoxyl radicals. Compounds E1 and (or) E3 were the most active in both antioxidative and radical-scavenging reactions.
authors.affiliation: National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China.
authors.forename: Yu-Jun
authors.initials: YJ
authors.lastname: Cai
authors.forename: Jin-Qiu
authors.initials: JQ
authors.lastname: Dai
authors.forename: Jian-Guo
authors.initials: JG
authors.lastname: Fang
authors.forename: Lan-Ping
authors.initials: LP
authors.lastname: Ma
authors.forename: Li-Fen
authors.initials: LF
authors.lastname: Hou
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Zhong-Li
authors.initials: ZL
authors.lastname: Liu
mesh_terms: D000818:Animals; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D019659:Asteraceae / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D026461:Ecdysteroids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D005260:Female; D016166:Free Radical Scavengers / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D006801:Humans; D008862:Microsomes, Liver / Q000187:drug effects / Q000378:metabolism; D010840:Phytosterols / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D051381:Rats; D017208:Rats, Wistar; D017392:Thiobarbituric Acid Reactive Substances / Q000378:metabolism
chemical_list: D000975:Antioxidants; D004365:Drugs, Chinese Herbal; D026461:Ecdysteroids; D016166:Free Radical Scavengers; D010840:Phytosterols; D017392:Thiobarbituric Acid Reactive Substances