1988
DOI: 10.1351/pac198860071039
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Vectorial phototransfer of electrons across lipid membranes

Abstract: Vectorial electron phototransfer across lipid membranesassisted by molecules -carriers of electronscan be used for providing spatially separated strong oxidant and reductant species. In this work the kinetics and mechanisms of the transmembrane vectorial electron phototransfer from donors located in the inner cavities of the lecithin lipid vesicles to acceptors located outside the vesicles were studied in two systems. The EDTA-ZnTPP-Methylviologen system contains tetraphenylporphyrinatozinc embedded into vesic… Show more

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Cited by 17 publications
(8 citation statements)
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“…5b should not exceed the amount of C16Vo+t produced at the first segment of the curve. However, the actual decrease of the amount of Fe(CN)~-turned out to be more than twice as much as expected [169,201]. This suggests the existence of an additional channel of electron transfer inside the vesicle, besides process (36) of CtrVo+~t migration.…”
Section: Viologen-containing Membranesmentioning
confidence: 66%
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“…5b should not exceed the amount of C16Vo+t produced at the first segment of the curve. However, the actual decrease of the amount of Fe(CN)~-turned out to be more than twice as much as expected [169,201]. This suggests the existence of an additional channel of electron transfer inside the vesicle, besides process (36) of CtrVo+~t migration.…”
Section: Viologen-containing Membranesmentioning
confidence: 66%
“…Co-existence of both these channels was observed for dark electron transfer across the viologen-containing vesicle membrane [169,201]. To illustrate this let us turn back to the experiments shown schematically in Fig.…”
Section: Viologen-containing Membranesmentioning
confidence: 88%
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“…They claimed that, in stopped-flow experiments, a steadystate was obtained where the viologen fluxes and the rates of reduction by external dithionite and oxidation by an internal electron acceptor were the same. It has been shown that the oxidized C,,~,V 2 § does not permeate the membrane of a lecithin vesicle (Zamaraev et al 1988;Hammarstr6m et al 1992). Also, the kinetic trace shown (Tabushi and Kugimiya 1985) for the fastest mediator used, C4.4, V 2 § exhibits almost no change in concentration of viologen radical between 20 and 30 s (taken as evidence for steady-state kinetics) which is not consistent with later results (Zamaraev et al 1988) where the observed rate in an identical experiment with C16,V 2+ was of the order of one second.…”
Section: "4 Systems With Viologens As Mediatorsmentioning
confidence: 99%
“…It has been shown that the oxidized C,,~,V 2 § does not permeate the membrane of a lecithin vesicle (Zamaraev et al 1988;Hammarstr6m et al 1992). Also, the kinetic trace shown (Tabushi and Kugimiya 1985) for the fastest mediator used, C4.4, V 2 § exhibits almost no change in concentration of viologen radical between 20 and 30 s (taken as evidence for steady-state kinetics) which is not consistent with later results (Zamaraev et al 1988) where the observed rate in an identical experiment with C16,V 2+ was of the order of one second. According to the figure caption (Tabushi and Kugimiya 1985), the amount of internal, secondary acceptor was too small to be able to re-oxidize all viologen since two equivalents are needed (vide infra), which explains the long-time stability of the viologen radical.…”
Section: "4 Systems With Viologens As Mediatorsmentioning
confidence: 99%