The Digestion of Acetylated Monglycerides and of Triglycerides

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Abstract
The mode of digestion of cottonseed oil, lard, hydrogenated lard, and distilled acetylated glycerides has been studied by analyzing the lipid recovered from the stomach, small intestine, cecum-colon, and feces after feeding diets containing the various fats to adult rats. The digestion of cottonseed oil and lard followed the pattern which might be predicted for partially unsaturated triglycerides. Little lipolysis occurred in the stomach, but extensive lipolysis occurred in the small intestine, with the resulting products being absorbed rapidly. The digestion of a characteristic saturated triglyceride, fully hydrogenated lard, was similar to that of unsaturated triglycerides except for a greater degree of gastric lipolysis. This increased lipolysis appeared to reflect some physiological effect of the fat. In contrast to the unsaturated triglycerides, a large amount of fecal lipid was found, indicating a relatively poor absorption coefficient for the hydrogenated lard. The digestion of the distilled acetylated saturated monoglycerides prepared from hydrogenated lard coincided with that of hydrogenated lard. The digestion of distilled, acetylated, mixed saturated and unsaturated monoglycerides prepared from lard was intermediate between those for the saturated and unsaturated triglycerides. Analogous to that of other fats, the absorption of the digestive products of the distilled acetylated monoglycerides depended largely on their fatty acid composition.