title: [Coprecipitation of the Pseudomonas fluorescens lipase with hydrophobic compounds as an approach to its immobilization for catalysis in nonaqueous media].
abstract: The precipitation of N-cetylamine, N-cetylacetamide, hexan-1,2-diol, cetyl alcohol, and poly(butyl metacrylate) in acetone-water media in the presence of the lipase from Pseudomonas fluorescens was found to be accompanied by the coprecipitation of the enzyme. Within the lyophilized coprecipitates, the lipase exhibits a high catalytic activity and enantioselectivity in the reaction of (1RS)-phenylethanol acetylation with vinyl acetate in t-butyl methyl ether. In order of increasing lipase activity, the coprecipitates can be arranged in the series: cetyl alcohol, poly(butyl metacrylate), hexadecane-1,2-diol, N-cetylamine, and N-cetylacetamide, with the activity 2.5- to 19-fold exceeding the activity of the native enzyme. The immobilization of the lipase on solid supports, such as Celite 545 (physical sorption) and Eupergit C250L (covalent binding), in the presence of hexadecane-1,2-diol was found to increase the esterifying activity of the enzyme. The English version of the paper.
authors.affiliation: Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul. Miklukho-Maklaya 16/10, Moscow, 117997 Russia. irinagorokhova@ibch.ru
authors.forename: I V
authors.initials: IV
authors.lastname: Gorokhova
authors.forename: A E
authors.initials: AE
authors.lastname: Ivanov
authors.forename: V P
authors.initials: VP
authors.lastname: Zubov
mesh_terms: D000473:Alkanes / Q000737:chemistry; D000588:Amines / Q000737:chemistry; D002384:Catalysis; D011232:Chemical Precipitation; D007692:Diatomaceous Earth; D004800:Enzymes, Immobilized / Q000737:chemistry*; D006838:Hydrocarbons; D007536:Isomerism; D008049:Lipase / Q000737:chemistry* / Q000302:isolation & purification* / Q000378:metabolism; D010626:Phenylethyl Alcohol / Q000737:chemistry / Q000378:metabolism; D011109:Polymethacrylic Acids / Q000737:chemistry; D011551:Pseudomonas fluorescens / Q000201:enzymology*; D014867:Water
chemical_list: D000473:Alkanes; D000588:Amines; D004800:Enzymes, Immobilized; D006838:Hydrocarbons; D011109:Polymethacrylic Acids; D014867:Water; D007692:Diatomaceous Earth; C068872:polybutyl methacrylate; D008049:Lipase; C007932:n-hexadecane; D010626:Phenylethyl Alcohol; C013553:hexadecylamine