Simultaneous dual wavelength spectrophotometric determination of citric and ascorbic acids using an artificial neural network |
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Authors: | K Zarei M Atabati N Karimian |
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Institution: | (1) Department of Chemistry, Damghan University of Basic Science, Damghan, Iran |
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Abstract: | In this study, a very simple spectrophotometric method for the simultaneous determination of citric and ascorbic acid based
on the reaction of these acids with a copper(II)-ammonia complex is presented. The Cu2+-NH3 complex (with λmax = 600 nm) was decomposed by citrate ion and formed a Cu2+-citrate complex (with λmax = 740 nm). On the other hand, during the reaction of ascorbic acid with copper(II)-ammonia complex, ascorbic acid is oxidized
and the copper(II)-ammonia complex is reduced to the copper(I)-ammonia complex and the absorbance decreases to 600 nm. Although
there is a spectral overlap between the absorbance spectra of complexes Cu2+-NH3 and Cu2+-citrate, they have been simultaneously determined using an artificial neural network (ANN). The absorbances at 600 and 740
nm were used as the input layer. The ANN architectures were different for citric and ascorbic acid. The output of the citric
acid ANN architecture was used as an input node for the ascorbic acid ANN architecture. This modification improves the capability
of the ascorbic acid ANN model for the prediction of ascorbic acid concentrations. The dynamic ranges for citric and ascorbic
acid were 1.0–125.0 and 1.0–35.0 mM, respectively. Finally, the proposed method was successfully applied to the determination
of citric and ascorbic acids in vitamin C tablets and some powdered drink mixes.
The text was submitted by the authors in English. |
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