R. A. Coulson
Oct 1, 1944
Citations
0
Influential Citations
4
Citations
Journal
Nature
Abstract
NICOTLNAMIDE methochloride, the principal urinary derivative of nicotinamide, nicotinic acid and nikethamide, can be estimated in urine by adsorption on ‘Decalso’, elution with potassium chloride and extraction of the eluate with alkaline isobutanol1. By this procedure the methochloride is conversssted into a whitish fluorescent derivative, F2, the concentration of which is estimated fluorimetrically. Aneurin is also estimated in urine by adsorption with ‘Decalso’, elution with potassium chloride and extraction of the eluate with isobutanol after the addition of alkali and potassium ferricyanide2. The thiochrome thus formed is estimated fluorimetrically in much the same manner as that employed for F2. It has been found, however, that pure aqueous solutions of nicotinamide methochloride are also converted into a deep blue fluorescent pigment closely resembling thiochrome by alkaline-ferrieyanide-iso-butanol treatment3. In other words, the methochloride may be converted into the whitish fluorescent pigment F2 by alkali and isobutanol alone, or into a deep blue fluorescent pigment by alkali, isobutanol and ferricyanide.