Abstract
We investigated lipase-catalyzed hydrolysis in water and dioxane—water with a simple colorimetric method. We screened 24 lipases for the ability to hydrolyze p-nitrophenyl esters as chromogenic substrates. Their hydrolytic activities were varied by adding dioxane. Most of the lipases showed high activity in hydrolysis in water, but some showed activity in 50% dioxane—water several tens times higher than those in water. Moreover, several lipases with hydrolytic abilities in 50% dioxane—water also catalyzed the transesterification of p-nitrophenol using fatty acid vinyl esters. We found it possible that a useful lipase for transesterification can be selected by measuring the hydrolysis activity of p-nitrophenyl ester in 50% dioxane—water.
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