title: Effects of phytic acid on the myoglobin-t-butylhydroperoxide-catalysed oxidation of uric acid and peroxidation of erythrocyte membrane lipids.
abstract: Phytic acid stimulated the myoglobin-t-butylhydroperoxide (TBHP)-catalysed oxidation of uric acid, but inhibited the peroxidation of erythrocyte membrane lipids induced by the same system. Butylated hydroxytoluene, a free radical chain reaction-terminating antioxidant, also suppressed the myoglobin-TBHP-induced lipid peroxidation. Moreover, phytic acid inhibited the hydroxyl radical-induced degradation of deoxyribose, but the extent of inhibition in this system was reduced by increasing the ferric ion concentration, suggesting that these effects of phytic acid on the myoglobin-TBHP-mediated oxidation are more likely attributable to its metal chelating properties rather than to a free radical scavenging action. The effectiveness of phytic acid, a naturally occurring antioxidant, in the inhibition of both iron- (as previously shown) and myoglobin-dependent lipid peroxidation suggests its possible therapeutic application as a non-toxic antioxidant for ameliorating the extent of oxy-radical-mediated myocardial ischemia/reperfusion damage.
authors.affiliation: Department of Pharmacology & Therapeutics, Faculty of Medicine, University of British Columbia, Vancouver, Canada.
authors.forename: K M
authors.initials: KM
authors.lastname: Ko
authors.forename: D V
authors.initials: DV
authors.lastname: Godin
mesh_terms: D004910:Erythrocyte Membrane / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D066298:In Vitro Techniques; D015227:Lipid Peroxidation; D008563:Membrane Lipids / Q000378:metabolism*; D009211:Myoglobin / Q000502:physiology*; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry / Q000494:pharmacology*; D010833:Phytic Acid / Q000494:pharmacology*; D014527:Uric Acid / Q000378:metabolism*; D020122:tert-Butylhydroperoxide
chemical_list: D008563:Membrane Lipids; D009211:Myoglobin; D010545:Peroxides; D014527:Uric Acid; D010833:Phytic Acid; D020122:tert-Butylhydroperoxide