The antioxidant activity of marchantin H was investigated using various experimental models. Marchantin H inhibited nonenzymatic iron-induced lipid peroxidation in rat brain homogenates with an IC50 value of 0.51 ± 0.03 μM. It was more potent than desferrioxamine or other classical antioxidants. Marchantin H also suppressed NADPH-dependent microsomal lipid peroxidation with an IC50 value of 0.32 ± 0.01 μM without affecting microsomal electron transport of NADPH-cytochrome P450 reductase. Marchantin H could scavenge the stable free radical 1,1-diphenyl-2-picrylhydrazyl and peroxyl radical derived from 2,2'-azobis(2-amidinopropane) dihydrochloride in aqueous phase, but not the peroxyl radical derived from 2,2'-azobis(2,4- dimethylvaleronitrile) in hexane. The oxygen consumption during peroxyl radical-induced human erythrocyte ghost oxidation was decreased in a concentration-dependent manner by marchantin H. Furthermore, it was reactive toward superoxide anion generated by the xanthine/xanthine oxidase system. On the other hand, marchantin H inhibited copper-catalyzed oxidation of human low-density lipoprotein, as measured by fluorescence intensity, thiobarbituric acid-reactive substance formation, and electrophoretic mobility in a concentration-dependent manner. Our results indicate that marchantin H is a potentially effective and versatile antioxidant and can be used as a chaperone protecting biomacromolecules against peroxidative damage.

Original languageEnglish
Pages (from-to)18-26
Number of pages9
JournalArchives of Biochemistry and Biophysics
Issue number1
Publication statusPublished - Oct 1 1996


  • antioxidant
  • free radical
  • lipid peroxidation
  • liver microsome
  • low-density lipoprotein
  • marchantin H
  • peroxyl radical
  • superoxide anion

ASJC Scopus subject areas

  • Molecular Biology
  • Biophysics
  • Biochemistry


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