Chinese Journal of Catalysis ›› 2011, Vol. 32 ›› Issue (6): 1063-1068.DOI: 10.3724/SP.J.1088.2011.01150

• Research papers • Previous Articles     Next Articles

Regioselective Galactosylation of Floxuridine Catalyzed by β-Galactosidase from Bovine Liver in Co-solvent Systems

YE Min1, LIU Qiuping1, LI Ning2,3,a, ZONG Minhua2,b   

  1. 1School of Biosciences and Bioengineering, South China University of Technology, Guangzhou 510006, Guangdong, China; 2State Key Laboratory of Pulp and Paper Engineering, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, Guangdong, China; 3State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China
  • Received:2010-11-19 Revised:2011-03-11 Online:2011-06-21 Published:2014-10-31

Abstract: The influence of organic solvents and their contents on the regioselective galactosylation of floxuridine catalyzed by β-galactosidase from bovine liver was investigated in co-solvent systems. It was revealed that the enzyme was unstable and inactivated substantially in organic solvent (10%, v/v)-containing systems, and the detrimental impacts of organic solvents on the enzyme could be relieved remarkably by decreasing their contents. Nevertheless, the addition of organic solvents exerted no influence on the regioselectivity of the enzymatic glycosylation, which retained >99%. The catalytic performance of β-galactosidase from bovine liver correlated well with the dielectric constants of organic solvents in co-solvent systems, among which the enzyme displayed the highest activity in dimethyl sulfoxide (DMSO)-containing system. The yield of desired product reached 71% when the DMSO content was less than 5% (v/v) in the medium.

Key words: β-galactosidase, glycosylation, regioselectivity, floxuridine, organic solvent