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Metabolism of L-Arabinose and D-Xylose by Chicks¹

Department of Animal Science, University of Minnesota, St. Paul, Minnesota.

Studies are reported on metabolism by chicks of dietary and parenteral (labeled) L-arabinose and D-xylose. Blood hematocrit, total reducing sugars, cholesterol, serine and proline in plasma and total reducing sugars in excreta increased due to graded (10, 20 and 40%) levels of dietary pentoses. Pentose treatments decreased liver weight, liver lipids and glutamic acid and lysine in plasma. Arabinose but not xylose decreased plasma alkaline phosphatase activity and potassium ion and increased chloride. The increases in total reducing sugars in plasma were found to be due to ingested pentoses. Radioisotope studies showed that L-arabinose is better metabolized than D-xylose by the chicks, but that neither pentose is metabolized to CO₂ as rapidly as D-glucose. The metabolic fate of 1-¹⁴C label and possible pathways for these pentoses are discussed.

² Present address: Department of Biochemistry, School of Medicine, Dentistry and Pharmacy, State University of New York at Buffalo, New York.

Manuscript received 3 March 1967.