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Journal of Nutrition Vol. 118 No. 1 January 1988, pp. 61-64
Copyright © 1988 by American Society for Nutrition
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Site of Zinc Absorption in Dog Small Intestine

Yehezkel Naveh1, Lea Bentur and Eric Diamond*

* Departments of Pediatrics and Clinical Biochemistry, Rambam Medical Center and Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel

An in vivo intestinal perfusion technique was used to study the absorption of zinc from the duodenum, proximal jejunum and distal ileum of six dogs (group 1). Net absorption of zinc from the duodenum before and after ligation of the common bile duct averaged 596 and 574 ng · min-1 · cm-1, respectively. Zinc absorption was greater (P < 0.01) from the duodenum than from the jejunum (251 ng · min-1 · cm-1) or ileum (404 ng · min-1 · cm-1). Four other dogs (group 2) experienced perfusion of approximately equal segments of the duodenum (in two animals the common bile duct was ligated, and in another two it was not), proximal jejunum and distal ileum for 4 h. No change in absorption of zinc with time was noted, nor was any difference in absorption by the duodenum with and without ligation of the common bile duct observed. The data indicate that the duodenum has the greatest capacity for zinc absorption, followed by the distal ileum and proximal jejunum, and that pancreatic secretions do not appear to be necessary for adequate zinc absorption in the dog duodenum.

KEY WORDS: • zinc • absorption • duodenum • intestinal perfusion

1 To whom reprint requests should be addressed, at Department of Pediatrics, Rambam Medical Center, Haifa 35254, Israel.

Manuscript received 2 October 1986. Revision accepted 16 September 1987.






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