Use of Alizarin Red S as an Ion-Pair Reagent for the Spectrophotometric Assay of Fexofenadine in Pharmaceuticals and in Spiked Human Urine

<table>Effect of 1.0% ethanolic KOH (2 <i>μ</i>g mL<sup>−1</sup> FFH-AZS ion-pair).</table>

International Scholarly Research Notices

Figure 3: Use of Alizarin Red S as an Ion-Pair Reagent for the Spectrophotometric Assay of Fexofenadine in Pharmaceuticals and in Spiked Human Urine 