Monitoring of Oxidation Steps of Ascorbic Acid Redox Reaction by Kinetics-Sensitive Voltcoulometry in Unsupported and Supported Aqueous Solutions and Real Samples

ORLICKÝ Jozef, GMUCOVÁ Katarína, THURZO Ilja, PAVLÁSEK Juraj

doi:10.2116/analsci.19.505

Monitoring of Oxidation Steps of Ascorbic Acid Redox Reaction by Kinetics-Sensitive Voltcoulometry in Unsupported and Supported Aqueous Solutions and Real Samples

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ORLICKÝ Jozef

Institute of Molecular Physiology and Genetics, Slovak Academy of Sciences
GMUCOVÁ Katarína

Institute of Physics, Slovak Academy of Sciences
THURZO Ilja

Institute of Physics, Slovak Academy of Sciences
PAVLÁSEK Juraj

Institute of Normal and Pathological Physiology, Slovak Academy of Sciences

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Aqueous solutions of ascorbic acid in unsupported and supported aqueous solutions and real samples were studied by the kinetics-sensitive double-step voltcoulommetric method with the aim to contribute to a better understanding of its behavior in biological systems. The data obtained from measurements made on analytes prepared in the laboratory, as well as those made on real samples (some commercial orange drinks, flash of the fresh fruits) point to the redox reaction of L-ascorbic acid (L-AH₂) being very sensitive to both the presence of dissolved gaseous species (O₂, CO₂) and the ionic strenght in the analyte. Either the dissolved gaseous species, or the higher ionic strength caused by both the presence of supporting electrolyte and increased total concentration of ascorbic acid, respectively, give birth to the degradation of L-AH₂. Naturally, the highest percentage of L-AH₂ was spotted in fresh fruit.