Polyacrylate‐graft silica gel as a support of lipase intersterifying triacylglycerol in organic solvent

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Abstract
Butyl acrylate was graft polymerized onto silica gel, which had been doubly modified with γ‐aminopropyltriethoxysilane and 4,4′‐azobis(4‐cyanovaleric acid). 2‐(Methoxycarbonnyl)ethyltrichlorosilane was treated on another silica gel. The ester groups on both silica gel surfaces were transformed to azide to immobilize lipase. The activities of the immobilized lipase for interesterfication of triacylglycerol in isopropyl ether were examined and compare with that of adsorbed lipase on silica gel, and the polyacrylate‐graft silica gel was found to be an effectual support for the enzymatic interesterification. An apparent shift of the reaction equilibrium by removing water as an azeotrope of isopropyl ether is also described.