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American Journal of Clinical Nutrition, Vol 52, 502-508, Copyright © 1990 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Medium-chain-triglyceride lipid emulsion: metabolism and tissue distribution

RC Johnson, SK Young, R Cotter, L Lin and WB Rowe
Clintec Nutrition Company, Baxter Healthcare Corporation, Deerfield, IL 60073.

The utilization and distribution of radioactively labeled lipid emulsions were evaluated in Sprague-Dawley rats. Animals received one of three lipid emulsions. Group 1 received [14C]medium-chain- triglyceride (MCT) lipid emulsion, group 2 received a 75%:25% (vol:vol) admixture of [14C]MCT: unlabeled long-chain-triglyceride (LCT) lipid emulsion, and group 3 received only [14C]LCT. The radioactive dose appearing in expired carbon dioxide and various body tissues was monitored over a 24-h period. Results indicate that MCT is oxidized more rapidly and completely than in LCT; approximately 90% of the MCT is converted to carbon dioxide with in 24 h compared with 45% for LCT. When MCT and LCT are administered together, the metabolism of MCT is slowed but remains more rapid than that of LCT. Removal of MCT from the blood was more rapid than was removal of LCT, and tissue radioactivity was lower.


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