New Kinetic Spectrophotometric Method for Determination of Fexofenadine Hydrochloride in Pharmaceutical Formulations

Table 1

Regression equations for FEX at fixed time and 25°C.

Time (min)	Regression equation	Correlation coefficient	Linear range (μg mL^−1)
0	A = 0.0058C + 0.0111	0.9971	2.5–50.0
5	A = 0.0149C + 0.0028	0.9981	2.5–50.0
10	A = 0.0190C + 0.0094	0.9993	2.5–50.0
15	A = 0.0209C + 0.0240	0.9997	2.5–50.0
20	A = 0.0221C + 0.0350	0.9991	2.5–50.0
25	A = 0.0229C + 0.0495	0.9968	2.5–50.0
30	A = 0.0233C + 0.0645	0.9943	2.5–50.0

A: absorbance; C: concentration.