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Conversion of Glucose to Fructose in the Fetal Pig¹

University of Arkansas, Fayetteville 72701

Abstract

Sixteen crossbred fetal pigs 55 to 65 days of gestation were injected intraperitoneally with sugars containing uniformly labeled carbon (UL¹⁴C). Eight fetuses received injections of D-glucose; eight received D-fructose. Four hours thereafter, fetuses were delivered by Caesarean section and blood was withdrawn by heart puncture.

Chromatographed fetal blood samples revealed that injected labeled glucose was converted to labeled fructose in vivo. Blood glucose and fructose interconversions apparently do not occur because labeled glucose was not recovered in chromatographed blood samples from fetuses injected with labeled fructose.

Glucose entering the fetal pig may serve as an important precursor to blood fructose, and the conversion of glucose to fructose proceeds against an existing fructose gradient.

¹ This paper is submitted with the approval of the Director of the Arkansas Experimental Station.

² Present address: University of Florida, Institute of Food and Animal Science, Live Oak, FL 32060.