CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
Investigation of the causes of deactivation-degradation of the comercial biocatalyst Novozym® 435 in ethanol and ethanolaqueous media
CARLA JOSÉ; RITA D. BONETTO; LUIS A. GAMBARO; MARÍA DEL PILAR GUAUQUE TORRES; MARÍA LAURA FORESTI; MARÍA LUJÁN FERREIRA; LAURA E. BRIAND
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2011 vol. 71 p. 95 - 95
The effect of contacting neat ethanol and an ethanol: H2O mixture on Novozym® 435 was investigated at room temperature and 45 oC, during various periods of time of interaction with the alcohol (from 40 min to 8 days) and at different biocatalyst: ethanol ratios. The alcohol dissolves the polymethylmethacrylate (PMMA) that constitutes the support of the Candida antarctica B lipase (CALB) regardless of the conditions investigated and diffuses into the biocatalysts beads remaining strongly adsorbed (the desorption of the alcohol is evidenced only upon heating at 150 oC). The diffusion of the alcohol alters the inner texture of the beads generating channels and increasing the roughness of the polymeric material. Additionally, the ethanol modifies the secondary structure of the enzyme by decreasing the a-helix contributions and increasing the b-sheet structure.