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- ArticleCabot MC, Gatt S.Biochim Biophys Acta. 1978 Sep 28;530(3):508-12.Lipase activity towards triacylglycerol and diacylglycerol was measured at pH 4.8 using a microsomal preparation from rat brain as the enzyme source. The optimal pH for the hydrolysis of triacylglycerol was 4.8, with only minor lipolytic activity in the alkaline pH range. Diacylglycerol was the major product of triacylglycerol hydrolysis, with only little monoacylglycerol being formed. When diacylglycerol was the starting substrate it was hydrolyzed at a rate 10-fold greater than triacylglycerol, and the product was monoacylglycerol. The enzyme showed positional specificity for the fatty acid moieties located at the primary positions of sn-glycerol. 1,3-Diacylglycerol was hydrolyzed at greater than twice the rate of the corresponding 1,2(2,3)-isomer.