Abstract
AbstractThe polarographic features of several 3‐keto‐sugars were studied. The effects of pH, incubation time, boric acid and concentration were determined. Spectrophotometric measurements were carried out simultaneously.The structure of 3‐keto‐lactose in aqueous solutions, its chemical conversions at higher pH and the electroreduction mechanism were deduced. There is evidence that the carbonyl function of various 3‐uloses in neutral, slightly acid and basic solutions is hydrated, the degree of hydration varying with the type of the 3‐ulose. As the electroreduction occurs on ly at the free carbonyl function, the limiting current is determined by the dehydration rate. Their polarographic properties indicate that the ketones are readily reducible in a two‐electron process, presumably to the corresponding isomeric sugars. There is strong evidence that reductones are formed in alkaline conditions.
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