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RevistaBiotechnology Progress

Immobilization on octyl-agarose beads and some catalytic features of commercial preparations of lipase A from Candida antarctica (Novocor ADL). Comparison with immobilized lipase B from Candida antarctica

Autores:Roberto Fernandez-Lafuente
Grupos de investigación:Optimización de biocatalizadores y bioprocesos enzimáticos
Sara Arana-Peña+, Yuliya Lokha+, Roberto Fernández-Lafuente*

Lipase A from Candida antarctica (CALA, commercialized as Novocor ADL) was immobilized on octyl agarose, which is a very useful support for lipase immobilization, and coated with polyethylenimine (PEI) to improve the stability. The performance was compared to that of the form B of the enzyme (CALB) immobilized on the same support, as both enzymes are among the most popular ones used in biocatalysis. CALA immobilization produced a significant increase in enzyme activity versus p-nitrophenyl butyrate (by a factor of 7) and the coating with PEI did not have a significant effect on enzyme activity. CALB reduced its activity slightly after enzyme immobilization. Octyl-CALA was less stable than octyl-CALB at pH 9, and more stable at pH 5 and, more clearly, at pH 7. PEI coating only increased octyl-CALA stability at pH 9. In organic solvents, CALB had much better stability in methanol, and was similarly stable in acetonitrile or dioxane. In these systems, the PEI coating of octyl-CALA permitted some stabilization. While octyl-CALA was more active versus pNPB, octyl-CALB was much more active versus mandelic esters or triacetin. Thus, depending on the specific reaction and the conditions, CALA or CALB may offer different advantages and drawbacks
Palabras clave:Stability, Hydrophobic supports, interfacial activation, lipases, activity, PEI coating.
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