2016
DOI: 10.1016/j.arabjc.2011.10.006
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Sensitive and selective spectrophotometric assay of rizatriptan benzoate in pharmaceuticals using three sulphonphthalein dyes

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Cited by 10 publications
(3 citation statements)
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“…The maximum absorption of the reaction product is measured at a wavelength of 348 nm (Figure 3). It is known that when sulfonephthalein dyes interact with nitrogen-containing compounds in organic solvents, ionic pairs are formed the proton transfer mechanism [27,28]. Thus, the secondary aliphatic amino group of meloxicam attaches a proton to the phenolic group of the dye.…”
Section: Resultsmentioning
confidence: 99%
“…The maximum absorption of the reaction product is measured at a wavelength of 348 nm (Figure 3). It is known that when sulfonephthalein dyes interact with nitrogen-containing compounds in organic solvents, ionic pairs are formed the proton transfer mechanism [27,28]. Thus, the secondary aliphatic amino group of meloxicam attaches a proton to the phenolic group of the dye.…”
Section: Resultsmentioning
confidence: 99%
“…ІА, які утворюються в результаті реакції, мають високу стійкість. Так, ІА різатріптану з БФС, БКП та БТС мали умовну константу стійкості в одиницях logKf 7.75, 6,47 та 7.19, відповідно [17].…”
Section: вступunclassified
“…Bromothymol blue (BTB) ( Figure 1(d) ) is an anionic dye and that can be protonated or deprotonated to form yellow or blue, respectively. The BTB was used to make ion-pair complex, which was applied to determine many pharmaceutical compounds by extractive spectrophotometric methods [ 21 30 ]. However, the ion-pair complex between BTB and FQs has not been studied.…”
Section: Introductionmentioning
confidence: 99%