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Kinetické stanovení kyseliny L-askorbové s využitím oscilujícího chemického systému

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Title in English Kinetic Determination of L-ascorbic Acid Using an Oscillating Chemical System


Year of publication 2006
Type Article in Periodical
Magazine / Source CHEMICKÉ LISTY
MU Faculty or unit

Faculty of Science

Field Analytic chemistry
Keywords kinetic determination; Belousov-Zhabotinskii oscillating reaction; spektrophotometric detection; vitamin C (L-ascorbic acid); artificial neural network (ANN)
Description A kinetic determination of L-ascorbic acid based on the Belousov-Zhabotinskii oscillating system was proposed. Optimal conditions are: c(BrO3-) = 0,0625 mol.l-1; c(malonic acid) = 0,1675 mol.l-1; c(Ce(IV)) = 0,002 mol.l-1; c(H2SO4) = 0,8 mol.l-1, temperature 30 C, absorbance was measured at wavelength 320 nm. For model samples, the calibration curve method gives the values with relative error lower than 10 %. The application of ANN to the calculation of results was demonstrated. The best results were obtained for the optimal ANN architecture applying the oscillation amplitude as values for layer of input neurons and L-ascorbic acid concentration as layer of output neuron (relative error < 5 %). The proposed method is suitable for the analysis of pharmaceutical preparations (Celaskon) but not for analysis of citrus fruits due to presence of other oxidiseable compounds.
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