title: Lipase-catalyzed degradation of polyesters in organic solvents. A new methodology of polymer recycling using enzyme as catalyst.
abstract: Enzymatic hydrolytic degradation of aliphatic polyesters in organic solvents has been examined. The degradation of poly(epsilon-caprolactone) took place using Candida antarctica lipase as catalyst in toluene at 60 degrees C to give oligomers with molecular weight of less than 500. The degradation behavior catalyzed by lipase was quite different than an acid-catalyzed degradation (random bond cleavage of polymer). After the removal of the solvent from the reaction mixture, the residual oligomer was polymerized in the presence of the same catalyst of lipase. These data provide a basic concept that the degradation-polymerization could be controlled by presence or absence of the solvent, providing a new methodology of plastics recycling.
authors.affiliation: Department of Materials Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan. kobayasi@mat.polym.kyoto-u.ac.jp
authors.forename: S
authors.initials: S
authors.lastname: Kobayashi
authors.forename: H
authors.initials: H
authors.lastname: Uyama
authors.forename: T
authors.initials: T
authors.lastname: Takamoto
mesh_terms: D002175:Candida / Q000201:enzymology; D002384:Catalysis; D003247:Conservation of Natural Resources; D008049:Lipase / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry*; D012997:Solvents; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D011091:Polyesters; D012997:Solvents; D008049:Lipase