Effect of hydrophobicity of yeast cell envelopes on the rate of methyl oleate autooxidation

The relationships between the antioxidant and antiperoxide properties and the lipid composition of yeast cell envelopes before and after interaction with a liquid culture medium was studied. Correlations between the hydrophobicity of cell envelopes, their lipid composition, and parameters of kinetic oxidation curves of model methyl oleate in the presence of lipids were found. Irrespective of the total lipid content in yeast cell envelopes, the preparations with a high antiperoxide activity of lipids exhibited a higher hydrophobicity and adsorbed lipophilic prooxidants from the medium more readily, whereas the preparations with a low antiperoxide activity were less hydrophobic and adsorbed predominantly lipophilic inhibitors. It was found that analysis of kinetic oxidation curves in toto provides the most comprehensive information on the physicochemical properties of lipids adsorbed from medium.