Abstract
The application of capillary zone electrophoresis to the determination of ascorbic acid and biotin in vitamin mixtures (pharmaceutical formulations and also native citrus juice and fruit beverage) was investigated. A method was developed for determining them together with thiamine, nicotinamide and nicotinic acid in a single run. For ascorbic acid, addition of L-cysteine as antioxidant was necessary to obtain reliable results. The performance of the method was tested according to sensitivity, detection limit and standard deviation.
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