ABSTRACT: Pseudomonas aeruginosa NS2001 can produce high amounts of extracellular lipase in 5-liter fermenters. Using a culture medium comprised of (NH4)2SO4 0.13% (w/v), KH2PO4 0.09% (w/v), K2HPO4 0.06% (w/v), MgSO4.7H2O 0.02% (w/v), yeast extract 0.01% (w/v) and fructose 2% (w/v) in total volume of 4.0 liter, the optimal conditions were: inoculum size at 0.5% (v/v) of the culture volume, aeration at 1.0 vvm, agitation speed of 250 rpm, temperature at 37°C and control pH at 7.0. Under the conditions, this strain produced the highest amount of lipase at 1475.25 unit/mg protein at 48 hours.
INTRODUCTION
Lipase (triacylglycerol acylhydrolase; (EC. 3.1.1.3) hydrolyzes long chain triglycerides to fatty acid and glycerol.(1) There has been a great increase in interest in the development of lipases in biotechnology in the past year due to their potential application in fat recycling, to fatty acids and glycerol, as well as in the synthesis of glycerides. The advantages of enzymatic hydrolysis over chemical processes are the lower energy requirements, lower environmental and economic costs of waste treatment due to its more environmental friendly waste products, and the higher quality of the final product.(2) The lipases from Pseudomonas aeruginosa are used in water-restricted medium with a variety of applications including organosynthesis reactions, the control and prevention of metalworking