2005
DOI: 10.1590/s0100-46702005000300010
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Abstract: A photometric flow titration based on the redox reaction between KMnO4 and minoxidil is described. The best titration results were observed at 3.20 x 10-4 mol L-1 KMnO4 and 1.00 x 10-3 mol L-1 minoxidil, using the minoxidil solutions as titrant. The flow rate was fixed at 17 mL min-1 and the titrant was added to the system in aliquots of 500 µL, the color changes were monitored at 550 nm. The method was applied to commercial samples and compared with the results from a chromatographic procedure. Recoveries fro… Show more

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Cited by 15 publications
(6 citation statements)
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“…Depending on the reaction to be accomplished concentrations of samples and standards were optimized in order to better exploit the analytical signals. Corrections of the analytical signals in order to minimize effects of dilution were done according to [7,10].…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Depending on the reaction to be accomplished concentrations of samples and standards were optimized in order to better exploit the analytical signals. Corrections of the analytical signals in order to minimize effects of dilution were done according to [7,10].…”
Section: Methodsmentioning
confidence: 99%
“…In this sense a special role is played by spectrophotometric [5,7], potentiometry [8,9] and conductimetry [10].…”
Section: Introduction Thmentioning
confidence: 99%
“…A promising approach to achieve more rapid throughput for analyses required in various fields is the application of flow titration techniques. The flow titration method has been reported by many investigators [ 3 9 ]. In the continuous flow titration method, Nagy et al [ 5 ] developed the “triangle-programmed titration technique” and applied it to an argentometric titration.…”
Section: Introductionmentioning
confidence: 99%
“…Com o objetivo de simplificar os procedimentos analíticos e reduzir custos de análise em amostras farmacêuticas com concentrações relativamente elevadas, Sousa e colaboradores [22], propuseram um método de titulação espectrofotométrica baseada na reação redox entre minoxidil em meio ácido e KMnO 4 . O método monitora o decréscimo da absorbância em 550 nm peal redução do KMnO 4 pelo minoxidil (Eq.…”
Section: Introductionunclassified