title: Modification of lipases with poly(ethylene glycol) and poly(oxyethylene) detergents and their catalytic activities in organic solvents.
abstract: The alpha-chymotrypsin-poly(ethylene glycol) complex, which was prepared by lyophilizing an aqueous solution, was found to have high catalytic activity in organic media even when the molar ratio of polymer/enzyme in its preparation stage is unity. In this study, we obtained freeze-dried complexes of lipases and poly(ethylene glycol) or poly(oxyethylene) detergents including newly synthesized gemini-type detergents, and their transesterification activity in organic solvents was evaluated. The freeze-dried lipase from Pseudomonas cepacia prepared by using each modifier showed enhanced transesterification activity, exhibiting a similar dependence on the concentration of the modifier in the preparation stage to that of the alpha-chymotrypsin-poly(ethylene glycol) complex; in contrasts, the one from Candida rugosa did not do so.
authors.affiliation: Department of Applied Chemistry and Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Mine
authors.forename: K
authors.initials: K
authors.lastname: Fukunaga
authors.forename: M
authors.initials: M
authors.lastname: Yoshimoto
authors.forename: K
authors.initials: K
authors.lastname: Nakao
authors.forename: Y
authors.initials: Y
authors.lastname: Sugimura