電流滴定によるベルベリンの定量
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概要
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An amperometric titration method was tried for berberine hydrochloride, using silicotungstic acid as a precipitating reagent.<BR>With H<SUB>2</SUB>SO<SUB>4</SUB> (0.10.2<I>N</I>) as supporting electrolyte, and employing a dropping mercury electrode, the titration was made with silicotungstic acid under an applied voltage of <I>E<SUB>c</SUB></I>=-0.85V <I>vs</I>. S. C. E.<BR>The results showed that one mol of silicotungstic acid combined with four mols of berberine hydrochloride. Utilizing the relation, 220 mg of berberine hydrochloride were determined with±2.0% error on the average.