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Distribution of carnitine and acylcarnitine in small intestine of carnitine-supplemented and fasted rats.

Distribution of carnitine and acylcarnitine in lumen flush and tissue of the small intestine was examined in four groups of male Sprague-Dawley rats fed either a nonpurified diet (groups 1, 2) or the same supplemented with 1% DL-carnitine (groups 3, 4). One group of animals under each dietary regimen (groups 2, 4) was fasted for 24 h prior to killing. Carnitine and acylcarnitines were present in higher concentrations in tissue of the small intestine than in the lumen flush. Even though the diets contained only traces of acid-soluble acylcarnitine, it was present in high concentrations both in tissue of the small intestine and lumen flush. Proximal segments of small intestine tended to concentrate carnitine and acylcarnitines under all conditions of treatment. Carnitine supplementation increased the amounts of carnitines in tissue; however, there was only a minor alteration in the pattern of distribution of carnitine and acylcarnitines.