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American Journal of Clinical Nutrition, Vol 50, 1029-1038, Copyright © 1989 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Vitamin A in parenteral nutrition: uptake and distribution of retinyl esters after intravenous application

T Gerlach, HK Biesalski, H Weiser, B Haeussermann and KH Baessler
Department of Physiological Chemistry, University of Mainz, FRG.

Short-term parenteral application of vitamin A was examined in rats. Retinyl margarinate, which is chemically similar to physiological retinyl esters, was used in vitamin A-depleted rats to study uptake, distribution, and storage of retinyl esters in tissues. Vitamin A- depleted and Vitamin A-sufficient rats were infused with a micellar suspension of retinyl margarinate for 7 h and then killed at different times. Retinyl margarinate was directly taken up by all tissues examined. It appears that infusion of retinyl esters in micellar form provides a direct way to supply vitamin A to peripheral, vitamin A- dependent tissues. Therefore, a short-term infusion of retinyl esters with an emulsifier may be an effective means of preventing development of vitamin A-deficiency during long-term application of TPN, particularly in cases of liver dysfunction.


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