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    Immobilization of lipases on different carriers and their use in synthesis of pentyl isovalerates
    (Taylor & Francis Inc, 2004) Sagiroglu, A; Telefoncu, A
    Porcine pancreatic lipase (PPL) and Candida cylindracea lipase (CCL) were immobilized on Celite and Amberlite IRA 938 by deposition from the aqueous solution by the addition of hexane. The influence of the immobilization on the activities of the immobilized lipase derivatives has been studied. The immobilized lipases were used in synthesis of pentyl isovalerates. Various reaction parameters affecting the synthesis of pentyl isovalerates were investigated. The reaction rates were compared with the rates of esterification with free lipases. The immobilized lipases were found to be very effective in the esterification reaction. The lipases immobilized on Celite 545 exhibited better operational stabilities than that of immobilized on Amberlite IRA-938.
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    Preparation and properties of lipases immobilized on different supports
    (Informa Healthcare, 2004) Sagiroglu, A; Kilinç, A; Telefoncu, A
    Porcine pancreatic lipase and Candida cylindracea lipase were immobilized on Celite and Amberlite IRA-938. Activities and stabilities of immobilized lipases were investigated. The immobilized lipase derivatives on Celite exhibited grater residual activity and more resistance to thermal inactivation than their immobilized counterpart on Amberlite IRA-938. The apparent optimum temperatures of the immobilized lipases were 7-10degreesC higher than that of the free enzymes. The native lipase and lipases immobilized on Celite showed same behaviors of pH dependence. But the pH optimum values for lipases immobilized on Amberlite IRA-938 were shifted to the acidic region relative to that of free enzymes. The stabilities of free and immobilized lipases were also investigated.