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Two new simple, precise, rapid and extn.-free spectrophotometric methods are proposed for the detn. of gatifloxacin (GTF) using bromate-bromide mixt. and two dyes, methylene blue and rhodamine B, as reagents.  Spectrophotometric methods entail the addn. of a known excess of bromate-bromide mixt. to GTF in hydrochloric acid medium followed by detn. of residual bromine by reacting with a fixed amt. of either methylene blue and measuring the absorbance at 665 nm (Method A) or rhodamine B and measuring the absorbance at 555 nm (Method B).  Beer's law is obeyed in the ranges, 0.5-5.0 and 0.2-1.5 Î¼g mL-1 for method A and method B, resp.  The apparent molar absorptivities are calcd. to be 5.6 Ã— 104 and 9.6 Ã— 104 L mol-1cm-1 for method A and method B, resp., and the corresponding Sandell sensitivity values are 0.0071 and 0.0042 Î¼g cm-2.  The methods were successfully applied to the assay of GTF in pharmaceutical formulations with satisfactory results. [on SciFinder(R)

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Sensitive Spectrophotometric Methods for the Determination of Gatifloxacin in Pharmaceuticals Using Bromate-Bromide, Methylene Blue and Rhodamine-B as Reagents