Photoredox Reactions in Liposome Systems and its Application to the Conversion of Light Energy into Chemical Energy

Kaztie Kurihara, Mitsunori Sukigara, Yoshinori Toyoshxma

Research output: Contribution to journalArticlepeer-review

Abstract

For designing a system which might effect the conversion of light energy into chemical energy through a coupling of photoredox reactions across membrane, we prepared a dispersion of phosphatidylcholine bilayer liposomes containing chlorophyll a. The concentration change of Cu2+, [Fe(CN)6]8- or O2 in the solution of outer compartment was measured during illumination with the light absorbable by chlorophyll a by the use of ESR, ion selective electrode or oxygen electrode. The enhancement of the photoreduction of Cu2+ by a reductant such as potassium ascorbate localized in a solution of the opposite side of the membrane suggested that photoredox reactions at both the membrane-solution interfaces of a liposome were coupled through the bilayer. Kinetic analysis of the reactions based on a possible reaction scheme was carried out and some of kinetic parameters were determined. The photo-induced consumption of [Fe(CN)6]3- or O2 in a solution of outer compartment was observed without addition of a particular reductant to the system. The reaction rate was strongly affected by the addition of carbonyl cyanide m-chlorophenylhydrazone (CCCP) to the dispersion. The O2 consumption was supressed by the existence of [Fe(CN)6]3- in a solution of the inner compartment. These facts suggest that the photoredox reactions at both the membrane-solution interfaces will be coupled in this case, through electron transport facilitated by the addition of CCCP across the bilayer membrane.

Original languageEnglish
Pages (from-to)499-505
Number of pages7
JournalNIPPON KAGAKU KAISHI
Volume1980
Issue number3
DOIs
Publication statusPublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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