Resumo

CRUZ-ORTIZ, Brenda Rogelina et al. Immobilization of Thermomyces lanuginosus Lipase in PVA-alginate Beads. J. Mex. Chem. Soc [online]. 2011, vol.55, n.3, pp.176-180. ISSN 1870-249X.

Thermomyces lanuginosus lipase was immobilized in PVA-alginate beads, obtaining immobilization % in the range of 94.4-98.4% using PVA concentrations ranging from 11% to 12.5%, and with cross linking times of 45 and 60 min using boric acid. Initial reaction rate was determined in free and immobilized state by hydrolysis of p-nitrophenol palmitate. Operational stability at different pH (4-7), agitation (100-500 r.p.m.), and temperature (40-80 °C) was investigated. Results showed that pH 6 and 7 no considerable loss of enzyme activity or enzyme was observed. At temperatures over 70 °C, enzyme suffers physical damage and showed a considerable loss of activity. No significant difference was observed when agitation was varied from 100 to 500 r.p.m.

Palavras-chave : lipase; immobilized; PVA-alginate; Thermomyces lanuginosus.

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