[Hemoglobin oxidation and erythrocyte hemolysis induced by a synthetic analog of alpha-tocopherol not containing an isoprenoid chain].

The effect of alpha-tocopherol and its synthetic analogue which does not contain an isoprenoid chain, 2,2,5,7,8-pentamethyl-6-hydroxychroman (chromanol), on rat erythrocyte and hemoglobin has been studied. Chromanol, unlike alpha-tocopherol, induces oxidation of hemoglobin into aquomethemoglobin and causes erythrocyte hemolysis. A mechanism of the reaction has been established.

[The role of isoprenoid chain of alpha-tocopherol in the protection of synaptosomes against lipid peroxidation and phospholipase A2-induced damage].

The role of the alpha-tocopherol molecule isoprenoid chain in synaptosomal membrane protection from lipid peroxidation activation and phospholipase A2 damage was investigated. A comparative study of alpha-tocopherol analogs differing in the length of the isoprenoid chain revealed that the increase in the chain length results in a decrease of the efficiency of inhibition in the course of synaptosomal lipid peroxidation activation. This effect is due to the diminution of mobility of chromanols in the lipid bilayer which is associated with an increase in the length of the isoprenoid fragment.

PUVA-induced erythema and changes in mechanoelectrical properties of skin. Inhibition by tocopherols.

Influence of antioxidants on two phototoxic effects of 8-methoxypsoralen (8-MOP) was studied: erythema and changes in mechanoelectrical properties of skin. alpha-Tocopherol and its analogs with shortened lateral hydrocarbon chains at C2-atoms of chromane groups (chromanols) were used as antioxidants. alpha-Tocopherol and its analogs inhibited both phototoxic effects of 8-MOP.

[Effect of lateral wick chain of tocopherols on oxidative reactions in lipids].

An injection of a alpha-tocopherol and analog devoid of the lateral chain (C1) at a dose of 90 mg/kg of body weight to experimental animals increases the levels of natural antioxidants and lipid oxidation in mouse liver 4- and 4.5-fold, respectively. The effects of alpha-tocopherol on the lipids possessing a high antiradical activity and containing the lateral chain and that of its analog, C1, also possessing a high antiradical activity but devoid of the lateral chain, were compared.