Title

Lipolysis of butter oil by immobilized lamb pregastric esterase: I. Uniresponse kinetics - pH and temperature effects

Document Type

Journal Article

Publication Date

1-1-2001

Journal

Journal of Dairy Science

Volume

84

Issue

5

DOI

10.3168/jds.S0022-0302(01)74563-8

Keywords

Hollow fiber reactor; Immobilized lipase; Lamb pregastric esterase; Lipolyzed butter oil

Abstract

Lamb pregastric esterase, immobilized by physical adsorption on microporous polypropylene in a hollow fiber reactor, has been employed to effect the continuous hydrolysis of the triglycerides in butter oil. Experimental data were obtained at temperatures from 35 to 45°C and pH values from 5.5 to 6.5. The overall rate of hydrolysis was fastest at 40°C and a pH of 6.0. Nonlinear regression methods were employed to determine the kinetic parameters of rate expressions based on a generic Ping-Pong Bi Bi mechanism. The best nonlinear fit of the data was consistent with a mechanism that assumes that acylation of the enzyme is the rate-limiting step in the hydrolysis reaction.

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