Kinetické stanovení kyseliny L-askorbové s využitím oscilujícího chemického systému

Warning

This publication doesn't include Faculty of Economics and Administration. It includes Faculty of Science. Official publication website can be found on muni.cz.

Title in English	Kinetic Determination of L-ascorbic Acid Using an Oscillating Chemical System
Authors	ZÁDĚROVÁ Lenka LUBAL Přemysl
Year of publication	2006
Type	Article in Periodical
Magazine / Source	CHEMICKÉ LISTY
MU Faculty or unit	Faculty of Science
Citation
Web	http://chemicke-listy.vscht.cz/docs/full/2006_04_277-281.pdf
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.
Related projects:	Artificial neural networks and experimental design in analytical chemistry, especially in separation methods