Abstract
The improved methods of quantitative analyses of nicotinic acid and nicotinamide were described, whereby the stable, colored compound obtainable by the reaction of nicotinic acid or nicotinamide and cyanogen bromide in Clark-Lubs buffer, pH 9.6 or 9.3, under a certain condition were photometrically determined. The fractional determination of nicotinic acid and nicotinamide is possible by use of anion exchange resin.
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