Combined Action of Lipase and Microbial Phospholipase C on a Model Fat Globule Emulsion and Raw Milk

Abstract

Phospholipase C from Pseudomonas fluorescens hydrolyzed phospholipids adsorbed to fat globules in a model emulsion composed of butteroil emulsified with crude soy lecithin. Modification of the membrane by this enzyme enhanced lipolysis when steapsin was introduced to the emulsion contained in a Bio-fiber beaker-type dialysis system. Following an initial period of induction, the velocity of lipolysis in the model emulsion was greater in the presence of phospholipase C than in its absence. Phospholipase C also enhanced the activity of milk lipase in raw milk. The magnitude of enhancement was much greater in milk than in the model emulsion. Presumptive data suggested that lipolysis by phospholipase C varied with intrinsic differences among various animals. © 1976, American Dairy Science Association. All rights reserved.