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Influence of gelation time on the morphological and physico-chemical properties of the sol–gel entrapped lipase

2008; Elsevier BV; Volume: 52-53; Linguagem: Inglês

10.1016/j.molcatb.2007.12.007

1873-3158

Rubiane C. Pinheiro, Cleide Mara Faria Soares, Onélia Aparecida Andreo dos Santos, Heizir F. de Castro, Flávio Faria de Moraes, Gisella Maria Zanin,

Electrochemical sensors and biosensors

Different gelation times (4, 18, 24 and 48 h) were used for the preparation of silica sol–gel supports and encapsulated Candida rugosa lipase using tetraethoxysilane (TEOS) as precursor. The hydrophobic matrices and immobilized lipases produced were characterized with regard to pore volume and size by nitrogen adsorption (BJH method), weight loss upon heating (TGA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), chemical composition (FTIR) and percentage of hydrolysis (POH%) of olive oil. These structural parameters were found to change with the gelation time, but no direct relation was found between the percentage of oil hydrolysis (POH%) and the gelation time. The best combination of high thermal stability and high POH% (99.5%) occurred for encapsulated lipase produced with 24 h gelation time.