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American Journal of Clinical Nutrition, Vol 30, 2078-2082, Copyright © 1977 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Intravenous feeding of the rat with short chain fatty acid esters. I. Glycerol monobutyrate

RH Birkhahn, RH McMenamy and JR Border

Intravenous nutrition was investigated using butyric acid because it is oxidized independent of carnitine transport into the cell mitochondria. This carnitine independent fatty acid, in the form of water soluble monobutyrin, was continuously infused into rats for seven days at 27 g monobutyrin per kilogram of body weight per day and provided half the daily energy requirement. All experimental animals survived the alimentation in good health and were free of detectable physiological and behavioral abnormalities. The intravenous infusion depressed the test animals spontaneous food intake to half their preinfusion level. These experimental rats still demonstrated continuous weight pain in contrast to weight loss by pair-fed controls. At decapitation, the monobutyrin infused rats had hepatic glycogen levels three times that of the controls, along with lower soluble hepatic protein, and normal lipid and water content. The plasma acetoacetate was also elevated in experimental rats. It was inferred from these results that monobutyrin was hydrolyzed, and the metabolites were oxidized by the rat. It is concluded from these observations that monobutyrin produces no obvious toxic affects during short infusion periods and provides calories for the rat when given intravenously.


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Copyright © 1977 by The American Society for Nutrition