title: Photostable chlorophyll a conjugated with poly(vinylpyrrolidone)-smectite catalyzes photoreduction and hydrogen gas evolution by visible light.
abstract: Chlorophyll a was adsorbed to a synthetic smectite intercalated by poly(vinylpyrrolidone) (PVP) to form the chlorophyll-PVP-smectite conjugate (Chl-PVP-SME) having an absorption maximum at 677 nm. The conjugate was found to be stable toward light illumination in comparison with chlorophyll-smectite, chlorophyll-PVP, and free chlorophyll a. Chl-PVP-SME had a photoinduced activity for catalyzing the reduction of methyl viologen. Furthermore, the evolution of hydrogen gas was observed when an aqueous suspension containing Chl-PVP-SME, methyl viologen (an electron carrier), 2-mercaptoethanol (an electron donor), and hydrogenase was illuminated by visible light.
authors.affiliation: Toin Human Science and Technology Center, Department of Materials Science and Technology, Toin University of Yokohama, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Itoh
authors.forename: A
authors.initials: A
authors.lastname: Ishii
authors.forename: Y
authors.initials: Y
authors.lastname: Kodera
authors.forename: A
authors.initials: A
authors.lastname: Matsushima
authors.forename: M
authors.initials: M
authors.lastname: Hiroto
authors.forename: H
authors.initials: H
authors.lastname: Nishimura
authors.forename: T
authors.initials: T
authors.lastname: Tsuzuki
authors.forename: T
authors.initials: T
authors.lastname: Kamachi
authors.forename: I
authors.initials: I
authors.lastname: Okura
authors.forename: Y
authors.initials: Y
authors.lastname: Inada
mesh_terms: D001426:Bacterial Proteins; D002384:Catalysis; D002734:Chlorophyll / Q000737:chemistry*; D000077194:Chlorophyll A; D016969:Desulfovibrio vulgaris / Q000201:enzymology; D004579:Electron Transport / Q000502:physiology; D005765:Gastrointestinal Agents / Q000737:chemistry*; D006859:Hydrogen / Q000378:metabolism*; D006864:Hydrogenase / Q000378:metabolism; D008027:Light; D010269:Paraquat / Q000378:metabolism; D011205:Povidone / Q000737:chemistry*; D017640:Silicates; D013053:Spectrophotometry; D053545:Spirulina
chemical_list: D001426:Bacterial Proteins; D005765:Gastrointestinal Agents; D017640:Silicates; D002734:Chlorophyll; D006859:Hydrogen; C033214:Smectite; D006864:Hydrogenase; D011205:Povidone; D010269:Paraquat; D000077194:Chlorophyll A