Production and properties of alkaline lipase from Alcaligenes sp. strain No. 679.

Abstract

For the production of extracellular lipase by Alcaligenes species No. 679, NaNO3, polyoxy-ethylene alkyl ether, Fe + +, sodium citrate and fructose were found to be effective. The enzyme was prepared by acetone precipitation from the filtrate of the culture broth of this strain. The enzyme was most active at pH 9.0 and 50°C, while 35% of its activity was lost on heat treatment at 60°C for l0min. Sodium salts of bile acids stimulated the enzyme activity. This lipase could hydrolyse natural fats and oils as well as olive oil. During the hydrolysis of olive oil, monoglyceride was found to accumulate up to 70 mol percent. This lipase possesses special properties similar to those of pancreatic lipase as shown in the comparative experiments.