Transmembrane reduction of methylviologen by ascorbate photosensitized by bacteriopheophytin a in liposomes. Effect of transmembrane potential

Operation of a bacteriopheophytin a (BPh) reductive mechanism for electron transfer in liposome media has been demonstrated. The electron transfer through the liposome wall can be accomplished mainly by an electron exchange mechanism between BPh in − and BPh out at opposing sides of the membrane. Th...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 1993-05, Vol.18 (2), p.221-226
Main Authors: Nadtochenko, V.A., Lavrentyev, A.I., Rubtsov, I.V., Nikandrov, V.V., Barannikova, Ya.V.
Format: Article
Language:English
Subjects:
Bacteriopheophytin
Electron transfer
Laser photolysis
Liposome
Transmembrane potential
Valinomycin
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Summary:Operation of a bacteriopheophytin a (BPh) reductive mechanism for electron transfer in liposome media has been demonstrated. The electron transfer through the liposome wall can be accomplished mainly by an electron exchange mechanism between BPh in − and BPh out at opposing sides of the membrane. The rate of electron transfer across the bilayer and the rate of backward recombination of BPh in − and ascorbate radicals on the inner liposome surface are influenced by the generation of transmembrane potentials with K + gradients in the presence of valinomycin. The ratio of the transmembrane electron transfer rate constants was measured at positive, negative and zero transmembrane potentials by laser photolysis.
ISSN:1011-1344
1873-2682
DOI:10.1016/1011-1344(93)80067-J