%0 Journal Article
%T Application of Haar and Mexican hat wavelets to double divisor-ratio spectra for the multicomponent determination of ascorbic acid, acetylsalicylic acid and paracetamol in effervescent tablets
%A Din£¿
%A Erdal
%A Baleanu
%A Dumitru
%J Journal of the Brazilian Chemical Society
%D 2008
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532008000300010
%X simultaneous determination of ascorbic acid (aa), acetylsalicylic acid (asp) and paracetamol (par) in their synthetic mixtures and effervescent tablets were performed by haar and mexican continuous wavelet transforms (haar-cwt and mexh-cwt, respectively) together with double divisor technique. the signal processing methods are based on the application of haar-cwt and mexh-cwt to the double divisor-ratio spectra (ddrs). these spectra were obtained by dividing the absorption spectra of pure compound and its ternary mixtures by a double-divisor or standard spectrum corresponding to a mixture of two compounds in ternary mixture. a combined use of haar-cwt and mexh-cwt with double divisor-ratio spectra (ddrs) was denoted by ddrs-haar cwt and ddrs-mexh cwt. to check the ability or applicability of the developed ddrs-cwt methods, the double divisor-ratio spectra-derivative spectrophotometric (ddrs-ds) method, as a comparison method, was applied to the above mentioned samples containing aa, asp and par and satisfactory results were obtained.
%K haar wavelet transform
%K mexican wavelet transform
%K double divisor-ratio spectra
%K ternary mixture analysis
%K effervescent tablet.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532008000300010&lng=en&nrm=iso&tlng=en