title: Cell debris self-immobilized thermophilic lipase: a biocatalyst for synthesizing aliphatic polyesters.
abstract: The paper explored the catalytic activity of a cell debris self-immobilized thermophilic lipase for polyester synthesis, using the ring-opening polymerization of ε-caprolactone as model. Effects of biocatalyst concentration, temperature, and reaction medium on monomer conversion and product molecular weight were systematically evaluated. The biocatalyst displayed high catalytic activity at high temperatures (70-90 °C), with 100 % monomer conversion. High monomer conversion values (>90 %) were achieved in both hydrophobic and hydrophilic solvents, and also in solvent-free system, with the exception of dichloromethane. Poly(ε-caprolactone) was obtained in 100 % monomer conversion, with a number-average molecular weight of 1,680 g/mol and a polydispersity index of 1.35 in cyclohexane at 70 °C for 72 h. Furthermore, the biocatalyst exhibited excellent operational stability, with monomer conversion values exceeding 90 % over the course of 15 batch reactions.
authors.affiliation: Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, College of Life Science, Jilin University, Changchun, 130012, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Sun
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.forename: Chenhui
authors.initials: C
authors.lastname: Wang
authors.forename: Jiaming
authors.initials: J
authors.lastname: Liu
authors.forename: Wei
authors.initials: W
authors.lastname: Shi
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Zhu
authors.forename: Laijin
authors.initials: L
authors.lastname: Lu
authors.forename: Quanshun
authors.initials: Q
authors.lastname: Li
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics; D002208:Caproates / Q000737:chemistry; D004795:Enzyme Stability; D004798:Enzymes / Q000737:chemistry; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D006358:Hot Temperature; D007783:Lactones / Q000737:chemistry; D008049:Lipase / Q000737:chemistry* / Q000235:genetics; D008970:Molecular Weight; D011091:Polyesters / Q000737:chemistry*; D058105:Polymerization; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics; D012997:Solvents / Q000737:chemistry
chemical_list: D001426:Bacterial Proteins; D002208:Caproates; D004798:Enzymes; D007783:Lactones; D011091:Polyesters; D011994:Recombinant Proteins; D012997:Solvents; C121056:caprolactone; D008049:Lipase