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Título: | Medium engineering on modified Geobacillus thermocatenulatus lipase to prepare highly active catalysts |
Autor: | Godoy, César A. CSIC ORCID; Fernández-Lorente, Gloria CSIC ORCID ; Rivas, Blanca de las CSIC ORCID; Filice, Marco CSIC ORCID; Guisán, José Manuel CSIC ORCID ; Palomo, José Miguel | Fecha de publicación: | 2011 | Editor: | Elsevier | Citación: | Journal of Molecular Catalysis B: Enzymatic: 70(3-4): 144-148 (2011) | Resumen: | The influence of additives on the activity of different covalently and site-specific chemically modified immobilized preparations of a lipase from Geobacillus thermocatenulatus (BTL2) was investigated with a view to obtain a very high active biocatalyst. Non-ionic surfactant and co-solvents at different concentration range were applied. The CNBr-BTL2 immobilized preparation, a very mild immobilized enzyme with similar properties to the soluble enzyme, exhibited an increase in activity of 3 fold in the presence of 20% (v/v) co-solvent (e.g., 1,4-dioxane) and 2.6 fold when Triton X-100 (v/v) was added in the hydrolysis of p-nitrophenylbutyrate. This immobilized preparation was hyper-activated in the presence of both additives although without a synergistic effect. The CNBr-BTL2 modified with polymers showed mild hyperactivation in the presence of each additives and even a synergy in the presence of both. In the best of cases, the HOOC-PEG1500-CNBr-BTL2 preparation showed up to 11 fold higher activity in the presence of additives combination than in absence of them. The glyoxyl-BTL2 preparation was hyper-activated in a similar way than CNBr-BTL2 in the presence of detergents but much less with co-solvents. However, the modified glyoxyl-BTL2 preparations were hyper-activated with solvent (2 fold) but not with detergent. An increase of 3 fold in activity for the modified glyoxyl-BTL2 preparations was observed in the presence of both additives. © 2011 Elsevier B.V. All rights reserved. | URI: | http://hdl.handle.net/10261/50032 | DOI: | 10.1016/j.molcatb.2011.03.001 | Identificadores: | doi: 10.1016/j.molcatb.2011.03.001 issn: 1381-1177 |
Aparece en las colecciones: | (ICP) Artículos (ICTAN) Artículos (CIAL) Artículos |
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