Photochemical synthesis of formic acid from CO2 with formate dehydrogenase and water-soluble zinc porphyrin

Ethanol synthesis based on the photoredox system consisting of photosensitizer and dehydrogenases

“…The conversion yield of MV 2+ to ethanol was decreased with increasing the initial concentration of MV 2+ concentration. We previous reported that the efficiency of the MV •+ production with visiblelight sensitization of water-soluble zinc porphyrin was decreased under higher concentration of MV 2+ [17]. Thus, this result suggests that ethanol production is dependent on the efficiency of the MV •+ production with visible-light sensitization of Zn Chl-e 6 .…”

“…For photoinduced hydrogen production systems, platinum nano-particle and enzyme, hydrogenase from Desulfovibrio vulgaris (Miyazaki) have been widely used as catalysts [6][7][8][9][10]. The photochemical and enzymatic synthesis of organic compounds has also been developed using this system in the presence of various enzymes [11][12][13][14][15][16][17][18][19][20][21][22]. Dehydrogenase enzymes such as lactate (LDH), formate (FDH), aldehyde (AldDH) and alcohol dehydrogenase (ADH) are useful enzymes for the synthesis of valuable organic compounds such as lactic acid, formic acid, methanol etc.…”

Effect of chemical structure of bipyridinium salts as electron carrier on the visible-light induced conversion of CO2 to formic acid with the system consisting of water-soluble zinc porphyrin and formate dehydrogenase

“…For visible light-induced hydrogen production systems, platinum nano-particle or enzyme hydrogenase has been used as hydrogen producing catalyst with the visible light sensitizers such as water soluble zinc porphyrins, ruthenium polypyridyl coordination complexes and chlorophyll-a [6][7][8][9][10][11][12][13][14][15][16][17][18]. The visible light induced chemical and enzymatic synthesis of organic compounds has also been developed using this system in the presence of various dehydrogenases such as lactate (LDH), formate (FDH), aldehyde (AldDH) and alcohol dehydrogenase (ADH) for the synthesis of valuable organic compounds such as lactic acid [19], formic acid [20][21][22][23][24][25][26][27][28], methanol [29][30] etc. Among these dehydrogenases, FDH catalyzes the conversion of CO 2 to formic acid in the presence of a suitable electron donating molecules as a coenzyme such as NADH, reduced form of bipyridinium salts and so on.…”

“…trisbipyridinium ruthenium (III) [Ru(bpy) 3 ] 2+ as a photosensitizer and mercaptoethanol (RSH) as an electron donor has been reported for the first time [20][21][22][23]. In contrast, we previously reported the photochemical and enzymatic formic acid synthesis from CO 2 or hydrogen carbonate ion with the system consisting of MV 2+ , FDH and watersoluble zinc porphyrin [25][26][27] or chlorophyll-a [28] in the presence of triethanolamine (TEOA) as an electron donor. To improve the yield of formic acid from CO 2 in the system consisting of a photosensitizer, an electron carrier molecule and FDH, an effective electron carrier molecule for activation of FDH activity of CO 2 to formic acid conversion is desirable.…”

Photochemical Synthesis of Methanol from Formaldehyde Using Alcohol Dehydrogenase Coupled with Photosensitization of Zinc Porphyrin

“…Zinc tetraphenylporphyrin tetrasulfonate (ZnTPPS) and zinc tetrakis(4-methylpyridyl) porphyrin (ZnTMPyP) are especially useful as photosensitizers 4),5) . We previously reported visiblelight induced enzymatic formic acid synthesis from HCO3 − with FDH using the photosensitization of watersoluble zinc porphyrin 6), 7) . Malic acid synthesis combined with the photoreduction of NADP + by the photosensitization of ruthenium(II) polypyridyl complex and ferredoxin-NADP + reductase (FNR), and malic acid synthesis from pyruvate and HCO3…”