[Effect of UV irradiation on conductivity of double-layer phospholipid membranes containing phylloquinone].

UV irradiation (lambda=360 nm) of octane solutions of phylloquinone and phospholipids causes quinone photodestruction and formation of lipoperoxides in the system. UV irradiation of phylloquinone-containing double layers induces and increase in their conductivity more than by two orders. Photoconductivity of the double layers is sharply inhibited in the presence of alpha-tocopherol. A conclusion is drawn that for elucidating the role of phylloquinone in biomembranes 360 nm UV irradiation should be applied very carefully taking into account the formation of lipoperoxides which increase the membrane permeability for H+(OH-) and accepting electrons from the components of redox-chains, may distort the picture of the electron and proton transport in the system.