[Free radical oxidation of biological membrane lipids. IV. iron salts in peroxidation catalysis of linoleic acid].

The validity of Nernst law for oxidative-reductive pair Fe3+:Fe2+ and absence of reproducible potential for pure solution of linoleic acid is shown. The value of Eo is calculated. It is found by comparing ORP values and spectrophotometrically measured concentrations of hydroperoxides that: 1) the rate of accumulation of hydroperoxides is determined by the initial concentration bivalent ferrum salt and seems not to depend on the kinetics of further change of ORP in the system; 2) during oxidation of linoleic acid the stationary concentration of Fe3+:Fe2+=40:1 is established which is independent of the initial concentration of ferrum ions; 3) ORP zone necessary for maximum rate of catalysis of free radical oxidation of linoleic acid in methanol lies in a more positive region than normal ORP of the pair Fe3+:Fe2+.