Acylic Sugar Derivatives for GC/MS Analysis of <sup>13</sup>C-Enrichment during Carbohydrate Metabolism
作者:Neil P. J. Price
DOI:10.1021/ac049198m
日期:2004.11.1
localize and quantify the fractional incorporation of 13C isotope into each carbon atom of precursor-derived metabolites. In this paper, several carbohydrate derivatization procedures (peracetylation, deuterioalditol acetates, and aldononitrile acetates) are evaluated for the positional isotopic information obtained by gas chromatography/electron impact mass spectrometry (GC/EI-MS). These derivatives
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
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
Moving C2 units: Transketolase from P. stipitis catalyzes a reversible C2‐transfer radical mechanism, in which the thiamine diphosphate cofactor is subject to enzyme‐catalyzed isomerization to form non‐Kekulé diradicals required for bond cleavage/formation because of suppression of the activation energy and activation and destabilization of intermediates.
移动 C 2单位:来自树干毕赤酵母的转酮醇酶催化可逆的 C 2转移自由基机制,其中硫胺素二磷酸辅因子受到酶催化异构化,形成键断裂/形成所需的非凯库勒双自由基,因为抑制了活化能以及中间体的活化和不稳定。