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  • 标题:Efficient Conversion of D-Glucose to D-Fructose in the Presence of Organogermanium Compounds
  • 本地全文:下载
  • 作者:Takae Nagasawa ; Katsuyuki Sato ; Yasuhiro Shimada
  • 期刊名称:Journal of Applied Glycoscience
  • 印刷版ISSN:1344-7882
  • 电子版ISSN:1880-7291
  • 出版年度:2016
  • 卷号:63
  • 期号:2
  • 页码:39-45
  • DOI:10.5458/jag.jag.JAG-2015_025
  • 出版社:The Japanese Society of Applied Glycoscience
  • 摘要:D-Glucose and D-fructose are isomers of commonly consumed monosaccharides. The ratio of conversion of D-glucose to D-fructose by glucose isomerase (xylose isomerase) is not more than 50 %. However, addition of an equimolar ratio of the organogermanium compound poly- trans -[(2-carboxyethyl)germasesquioxane] (Ge-132) or its derivative increases the conversion ratio to 80 %. In contrast, use of the Lobry de Bruyn–Alberda van Ekenstein transformation with heating results in a lower conversion ratio, less than 30 %, whereas addition of an equimolar concentration of Ge-132 or its derivative to this reaction mixture increases the ratio to 73 %. Therefore, in this study, we aimed to further analyze the affinity between organogermanium compounds (i.e., Ge-132 and its derivatives) and sugar using 1H-nuclear magnetic resonance (NMR) spectrometry. For the dimethyl derivative of Ge-132, the complex formation ratios at 0.25 M (mixing ratio 1:1) were 19 and 74 % for D-glucose and D-fructose, respectively. Additionally, the complex formation constants between monosaccharides and Ge-132 were 1.2 and 46 M-1 for D-glucose and D-fructose, respectively. The complex formation capacity was approximately 40-fold higher for D-fructose than for D-glucose. Therefore, we concluded that the high affinity for the product of isomerization may promote isomerization, and that promotion of sugar isomerization using organogermanium compounds is an effective method for conversion of D-glucose to D-fructose.
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