title: Influence of water activity on the enantioselective esterification of (R,S)-ibuprofen by crosslinked crystals of Candida antarctica lipase B in organic solvent media.
abstract: The lipase B from Candida antarctica was purified from a commercial source and crystallized. The microcrystals were crosslinked using glutaraldehyde. The crosslinked crystals were then used to catalyze the esterification of (R,S)-ibuprofen with dodecanol in octane at various water activities. As for the commercial preparation immobilized on acrylic resin, Novozym 435, low water activities foster better enantioselectivity, and the maximum reaction rates are obtained for a(W) = 0.1.
authors.affiliation: Microbial and Enzyme Technology Group, Biotechnology Research Institute, National Research Council, Montreal (Qc), H4P 2R2, Canada. robert.lortie@nrc.ca
authors.forename: P
authors.initials: P
authors.lastname: Pepin
authors.forename: R
authors.initials: R
authors.lastname: Lortie
mesh_terms: D002175:Candida / Q000201:enzymology*; D003432:Cross-Linking Reagents; D003460:Crystallization; D007851:Dodecanol / Q000378:metabolism; D004951:Esterification; D005656:Fungal Proteins; D007052:Ibuprofen / Q000378:metabolism*; D008049:Lipase / Q000302:isolation & purification / Q000378:metabolism*; D009795:Octanes / Q000737:chemistry*; D013237:Stereoisomerism; D013379:Substrate Specificity; D014867:Water / Q000737:chemistry*
chemical_list: D003432:Cross-Linking Reagents; D005656:Fungal Proteins; D009795:Octanes; D014867:Water; D007851:Dodecanol; D008049:Lipase; C431349:lipase B, Candida antarctica; D007052:Ibuprofen; C026728:octane