Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5997
Título: Synthesis of ethyl butyrate in organic media catalized by Candida rugosa lipase immobilized in polyurethane foams: a kinetic study
Autor: Pires-Cabral, P.
Fonseca, M.M.R. da
Ferreira-Dias, S.
Palavras-chave: biocatalyst preparation
polyurethane foams
Data: 2009
Editora: Elsevier
Citação: "Biochemical Engineering Journal". ISSN 1369-703X. 43 (2009) 327-332
Resumo: A kinetic study on the synthesis of ethyl butyrate in n-hexane, catalyzed by Candida rugosa lipase immobilized in two hydrophilic polyurethane foams (“HYPOL FHP 2002” and “HYPOL FHP 5000”)was performed. With the “FHP5000” foams, esterification rates and conversion were always higher than those obtained with “FHP2002”. For both immobilized preparations, BA did not cause any inhibition on the enzymatic activity, in the range of concentration tested (0.078–0.7M) at an initial ethanol concentration of 0.105M. Michäelis–Menten kinetics was observed: a plateau being reached at the initial bulk BA concentration of 0.40Mand 0.45 M, corresponding to microenvironmental concentrations of 0.851Mand 0.329 M, respectively with the lipase in “FHP2002” and “FHP5000” foams. Inhibition by EtOH was observed for initial bulk concentrations higher than 0.15 M, corresponding to microenvironmental concentrations of 0.426M and 0.256 M, for the lipase in “FHP2002” and “FHP5000” foams, respectively. Kinetic data could be well described by the substrate-inhibition model, considering the initial bulk or microenvironmental ethanol concentrations as inhibitory
Peer review: yes
URI: http://hdl.handle.net/10400.5/5997
ISSN: 1369-703X
Versão do Editor: www.elsevier.com/locate/bej
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