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Methods are described for the determination of carbon 14 in the te rminal positions of reducing sugars. fhe sugar in alkaline solution is oxidized by means of molecular oxygen to the next lower aldonic acid, and the acid is separated in the form of a convenient derivative. The loss in radioactivity coincident with the removal of carbon 1 is a measure of the activity located at this carbon. fh e activity of the carbon at the nom·educing end of the molecule is determined by periodate oxidation of the aldonic acid, followed by formation and radioactivity assay of the dimedone compound of the resulting formaldehyde. The me thod was applied to the labeled D-fructose prepared from D-mannitol-1-C 14 by the action of Acetobaeter suboxidans, and th e D-arabonic acid formed from th e D-fructose was isolated as potassium D-arabonate. It was found t ha t all of the ac t ivity of the labeled D-fructose was located equally at carbons 1 and 6. Potassium D-arabonate-5-C·4 was also prepared from D-mannitol-1-C" in 52-pe rcent yie ld (26-percent radiochemical yield) without the intermediate separat ion of crystallin e D-fructose-1,6-C14; it was then converted to D-arabinose-5-C 14 in an over-all radiochemical yield of 18 percent of the ori ginal D-manni tol·1-C14.

Determination of carbon-14 in the terminal positions of sugars: preparation of D-Arabinose-5-C+14 from D-Fructose-1,6-C+14