title: Immobilized chymotrypsin on reversibly precipitable polymerized liposome.
abstract: A polymerized liposome (PLS) was prepared using a synthesized phosphatidylethanolamine with a diacetylene moiety that showed a reversibly precipitable property on addition and removal of salt. To prepare a soluble-insoluble immobilized enzyme, chymotrypsin was covalently immobilized on the outer surface of the PLS. The carbodiimide method was employed for the enzyme immobilization. Coupling was rapid and nearly complete at a weight ratio of enzyme to the PLS of < 0.12. The immobilized enzyme showed favorable activity yields for both low- and high-mol-wt substrates, i.e., 90 +/- 9% for N-benzoyl-L-tyrosine ethyl ester and 59 +/- 5% for casein up to an enzyme coupling density of 0.38 g/g-PLS. The immobilized enzyme was reusable and more stable at high temperature and long-term incubation than the native enzyme.
authors.affiliation: Department of Chemical Engineering and Research Center for Biotechnology, Tianjin University, P.R. China.
authors.forename: Y
authors.initials: Y
authors.lastname: Sun
authors.forename: X H
authors.initials: XH
authors.lastname: Jin
authors.forename: X Y
authors.initials: XY
authors.lastname: Dong
authors.forename: K
authors.initials: K
authors.lastname: Yu
authors.forename: X Z
authors.initials: XZ
authors.lastname: Zhou
mesh_terms: D002918:Chymotrypsin / Q000737:chemistry*; D004800:Enzymes, Immobilized; D008081:Liposomes
chemical_list: D004800:Enzymes, Immobilized; D008081:Liposomes; D002918:Chymotrypsin