Rapid voltammetric procedures for the determination of water-soluble vitamins C, B1, and B2, fat-soluble vitamin E (α-tocopherol acetate), and quercetin in bioactive food additives have been developed. The systematic error (i.e., correctness) of the proposed procedures was evaluated using certified reference materials and the additive recovery tests, which gave the following limiting metrological characteristics: relative error, 25 %; reproducibility, 28 %; convergence, 22 %. The full analysis time (with sample preparation) did not exceed 2 hours. Voltammetric determinations under optimum conditions can be performed in the automated regime controlled by a computer according to the specially developed software.

The express voltammetric procedures of the determination of the water-soluble vitamins C, B 1 , B 2 , fat-soluble vitamin E (α-tocopherol acetate) and quercetin in bioactive additives have been developed. The systematic error component was evaluted with using certified reference materials and by recovery tests. The full analysis time (with probe treatment) did not exceed 2 hours. Voltammetric determinations in optimal conditions were computerized and the appropriate software have been designed.

Conditions for determining vitamin B2by stripping voltammetry were found, and a procedure was developed for measuring the mass concentration of vitamin B2in vitaminized supplements and feeds. Random error, as estimated for 13 different samples, varies in the range between 8 and 18 rel %. Total error was 35% in the whole analytical range. The procedure can be used for determining vitamin B2in multivitamin preparations, biologically active supplements, and pharmaceuticals.