Penicillium citrinum produced a lipase activity (5786 U/l), on a vegetable
oil refinery residue as carbon source, higher than the one (2630 U/l) obtai
ned on olive oil. Lipase activity was measured with triolein as substrate a
nd the free fatty acids released were estimated. Ammonium chloride (0.75%)
was the best nitrogen source (6738 U/l) compared to ammonium sulfate (5670
U/l), and urea caused a decrease of 85% in this lipase production (898 U/l)
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