Methylation in methanol-water mixtures: the effect of solvent quality and high-pressure

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Abstract

The effect of pressure (0.1 to 400 MPa) and solvent composition (methanol concentration of 5 to 30%) on the synthesis of ß-methylgalactoside was studied. Galactose was used as a reactant and the reaction was catalyzed by ß-galactosidase from Aspergillus oryzae. Under the applied conditions the enzyme was sufficiently stable and the reaction equilibrium was reached. Higher methanol concentrations obviously influenced the product yield positively due to an increase in reactant concentration but also due to a solvent effect. This solvent effect can be explained by measurement of the activities of galactose and methylgalactoside. These results may be generalized to other methylations in methanol¿water systems, where methanol positively affects synthesis yields. Pressure had a small, negative effect on synthesis yields.
Original languageEnglish
Pages (from-to)207-213
JournalBiophysical Chemistry
Volume134
Issue number3
DOIs
Publication statusPublished - 2008

Keywords

  • aspergillus-oryzae
  • beta-galactosidase
  • increased thermostability
  • alkyl glycosides
  • x measurements
  • range 278-k
  • 280 mpa
  • oligosaccharide
  • (1-x)h2o&xch3oh
  • equilibrium

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