The lipolytic and proteolytic activity of bacteria isolated from blended raw milk

Psychrotrophic bacteria have been isolated from supplies of blended raw milk over a period of 14 months. The isolates were partially classified and their ability to degrade milk fat and protein (at 6d̀C) examined. Pseudomonads were the predominant bacterial type and on average 43 per cent of these isolates were of the fluorescent type. These latter isolates together with isolates classified as Flavobacterium and Alcaligenes had associated with them the highest levels of lipase and protease activity.