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Intermolecular Specificity of Pancreatic Lipase and the Structural Analysis of Milk Triglycerides¹

Department of Animal Industries, University of Connecticut, Storrs

ABSTRACT

Pancreatic lipase released butyrate and palmitate in equimolar quantities from glyceryl 1-palmitate 2,3-dibutyrate (PBB), an absence of intramolecular specificity. However, when glyceryl 1-myristate 2,3-dioleate (MOO) was mixed with PBB, the latter was hydrolyzed more rapidly, indicating intermolecular specificity. Primary position specificity was maintained during 5-min digestions when glyceryl 2-butyrate 1,3-dipalmitate was the substrate. Data from the pancreatic lipase digestions of milk fat are presented. It is concluded that pancreatic lipase digests some classes of milk triglycerides more rapidly than others.

¹ Scientific contribution No. 81, Agricultural Experiment Station, University of Connecticut, Storrs, supported in part by Public Health Service research grant AM-02605-06 from the Institute of Arthritis and Metabolic Diseases.