Direct determination of zinc in insulin preparations by differential pulse polarography.
A rapid and direct differential pulse polarographic method for the determination of zine in insulin preparations is described. Optimum conditions were studied using 0.2 M acetate buffer (pH 4.1) as the supporting electrolyte. Agreement between the results by direct analysis and those by the procedure involving pressurized digestion was satisfactory.
Lewin
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LL
Departamento de Físico-Química y Técnicas Instrumentales, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain.
Sanz Pedrero
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P
Vilariño
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MR