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Volume 198, 2017
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Development of a dye molecule-biocatalyst hybrid system with visible-light induced carbon–carbon bond formation from CO2 as a feedstock

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Abstract

Recently, CO2 utilization technology, including artificial photosynthesis, has received much attention. In this field, CO2 is used as a feedstock for fuels, polymers and in other chemical processes. Of note are malic enzymes (MEs) which catalyze the reaction of malic acid to pyruvic acid and CO2 with the co-enzyme NADP+, and catalyze the reverse reaction of pyruvic acid and CO2 to malic acid with the co-enzyme NADPH. Thus, MEs are also an attractive biocatalyst for carbon–carbon bond formation from CO2. Studies of the visible light-induced malic acid production from pyruvic acid and CO2 using an electron donor, a photosensitizer, an electron mediator, ferredoxin-NADP+ reductase, NADP+, and ME have been reported. However, modification of these systems is required, as they are very complicated. In this study, the visible light-induced carbon–carbon bond formation from pyruvic acid and CO2 with ME using the photoreduction of 1,1′-diphenyl-4,4′-bipyridinium salt derivatives as a novel electron mediator with water-soluble tetraphenylporphyrin tetrasulfonate (H2TPPS) in the presence of triethanolamine (TEOA) as an electron donor was developed. When a sample solution containing TEOA, H2TPPS, 1,1′-diphenyl-4,4′-bipyridinium salt derivative, pyruvic acid, and ME in CO2-saturated bis–tris buffer was irradiated, the major product was oxaloacetic acid. Thus, a visible light-induced photoredox system for carbon–carbon bond formation from CO2 with ME using 1,1′-diphenyl-4,4′-bipyridinium salt derivative as an electron mediator was developed.

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Publication details

The article was received on 08 Oct 2016, accepted on 10 Nov 2016 and first published on 10 Nov 2016


Article type: Paper
DOI: 10.1039/C6FD00212A
Citation: Faraday Discuss., 2017,198, 73-81
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    Development of a dye molecule-biocatalyst hybrid system with visible-light induced carbon–carbon bond formation from CO2 as a feedstock

    Y. Amao, S. Ikeyama, T. Katagiri and K. Fujita, Faraday Discuss., 2017, 198, 73
    DOI: 10.1039/C6FD00212A

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