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

Table 6

Results of analysis of tablets by the proposed methods.

Tablet brand name	Label claim^b; mg/tablet	Found (Percent of label claim ± SD)^a
		Reference method	Proposed methods
			Method A	Method B
Allegra-180	180	99.36±1.65	98.28±1.09	98.62±1.26
			𝑡=2.71	𝑡=2.63
			𝐹=2.30	𝐹=1.71
Allegra-120	120	100.4±1.86	100.9±1.24	101.4±0.94
			𝑡=2.16	𝑡=2.13
			𝐹=2.25	𝐹=3.92

^aMean value of five determinations.
^bAventis Pharma Ltd.
Tabulated t-value at the 95% confidence level is 2.78.
Tabulated F-value at the 95% confidence level is 6.39.