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EFFECT OF TRANSMEMBRANE POTENTIAL ON CHARGE PHOTOSEPARATION IN LIPOSOMES
Author(s) -
NADTOCHENKO VICTOR A.,
LAVRENTYEV ANTON I.,
RUBTSOV IGOR V.,
DENISOV NIKOLAI N.,
BARANNIKOVA YANINA V.,
NIKANDROV VITALY V.,
KRASNOVSKY ALEXANDR. A.
Publication year - 1991
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1991.tb03932.x
Subject(s) - valinomycin , chemistry , liposome , membrane potential , radical , membrane , ion , electric field , electron transfer , aqueous solution , photochemistry , organic chemistry , biochemistry , physics , quantum mechanics
— An unexpected transmembrane potential effect on the recombination rate of the pheophytin or bacteriopheophytin anion‐radicals (dissolved in membrane) and ascorbic ion‐radicals (dissolved in aqueous interior) has been established in liposomes. The influence of transmembrane potential on the recombination rate of Ru 3+ (dissolved in inner volume) and (C 18 H 37 )V + or (C 14 H 29 )V + (dissolved in membrane) was observed. The potential was created by a potassium concentration gradient between inner and outer volumes of liposomes in the presence of valinomycin. The effect of the potential was considered on the bases of: (1) it was determined by the diffusional drift of the hydrophobic radicals in a radial direction in the membrane, according to the direction of the electric field; (2) the electric field changed the rate constant of the electron transfer, owing to the effects on the free energy and electronic coupling. Our results show the first explanation to be preferable.