Comproportionation of CO2 and Cellulose to Formate Using a Floating Semiconductor‐Enzyme Photoreforming Catalyst
摘要:
Abstract
Formate production via both CO2 reduction and cellulose oxidation in a solar‐driven process is achieved by a semi‐artificial biohybrid photocatalyst consisting of immobilized formate dehydrogenase on titanium dioxide (TiO2|FDH) producing up to 1.16±0.04 mmolformate g−1 in 24 hours at 30 °C and 101 kPa under anaerobic conditions. Isotopic labeling experiments with 13C‐labeled substrates support the mechanism of stoichiometric formate formation through both redox half‐reactions. TiO2|FDH was further immobilized on hollow glass microspheres to perform more practical floating photoreforming allowing vertical solar light illumination with optimal light exposure of the photocatalyst to real sunlight. Enzymatic cellulose depolymerization coupled to the floating photoreforming catalyst generates 0.36±0.04 mmolformate per m2 irradiation area after 24 hours. This work demonstrates the synergistic solar‐driven valorization of solid and gaseous waste streams using a biohybrid photoreforming catalyst in aqueous solution and will thus provide inspiration for the development of future semi‐artificial waste‐to‐chemical conversion strategies.
Integration of Enzymatic and Heterogeneous Catalysis for One-Pot Production of Fructose from Glucose
作者:Jiankui Sun、Helong Li、Hongzhi Huang、Bo Wang、Ling-Ping Xiao、Guoyong Song
DOI:10.1002/cssc.201800015
日期:2018.4.9
The search for efficient routes for the production of fructose from biomass‐derived glucose is of great interest and importance, as fructose is a highly attractive substrate in the conversion of cellulosic biomass into biofuels and chemicals. In this study, a one‐pot, multistep procedure involving enzyme‐catalyzed oxidation of glucose at C2 and Ni/C‐catalyzed hydrogenation of d‐glucosone at C1 selectively
Chemical synthesis of 13C labeled anti-HIV nucleosides as mass-internal standards
作者:Yoshio Saito、Thomas A Zevaco、Luigi A Agrofoglio
DOI:10.1016/s0040-4020(02)01246-2
日期:2002.11
Synthesis of [13C5]-labeled anti-HIV nucleosides, e.g. d4T, ddI, ddA, is described. The methodology used has been optimized due to the very high cost of the starting compound. The key step of this approach was the stereoselective dehomologation of 1,2:5,6-di-O-isopropylidene-3-oxo-α-d-glucofuranose (2) with periodic acid and sodium borohydride, which gave optically pure ribose derivative as the exclusive
Chemo-enzymatic synthesis of isotopically labeled nicotinamide riboside
作者:Ai Tran、Ryota Yokose、Yana Cen
DOI:10.1039/c8ob00552d
日期:——
developed a chemo-enzymaticsynthesis of isotopicallylabeled NAD+ precursor, nicotinamide riboside (NR). The synthesis of NR isotopomers allowed us to unambiguously determine that NR is efficiently converted to NAD+ in the cellular environment independent of degradation to nicotinamide, and it is incorporated into NAD+ in its intact form. The versatile synthetic method along with the isotopically labeled
Ru‐Catalyzed Switchable
<i>N</i>
‐Hydroxyethylation and
<i>N</i>
‐Acetonylation with Crude Glycerol
作者:Zhuo Xin、Le Jia、Yuxing Huang、Chen‐Xia Du、Yuehui Li
DOI:10.1002/cssc.201903151
日期:2020.4.21
Highly efficient Ru-catalyzed selective C-C or C-O bond cleavage of polyols (e.g., crude glycerol) for N-hydroxyethylation or N-acetonylation of amines was achieved through the hydrogen-borrowing approach. A variety of amines were transformed to the desired amino alcohols/ketones in moderate-to-excellent yields, opening up new avenues for generation of oxygenated pharmaceuticals and fine chemicals
The formation of furan and 2-methylfuran was studied in model systems based on sugars and selected amino acids. Both compounds were preferably formed underroastingconditions in closed systems yielding up to 330 micromol of furan and 260 micromol of 2-methylfuran per mol of precursor. The amounts obtained under pressure cooking conditions were much lower, usually below 20 micromol/mol, except for