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

Table 2

Analytical characteristics of the fixed time (15 min) method.

Parameters	FEX
𝜆max (nm)	610
Beer’s law range (𝜇g mL^−1)	2.5–50.0
Ringbom optimum concentration range (𝜇g mL^−1)	10.0–40.0
Detection limit (𝜇g mL^−1)	0.055
Quantification limit (𝜇g mL^−1)	0.183
Molar absorptivity (L mol^−1 cm^−1)	1.22 × 10^4
Stoichiometric relationship, FEX : KMnO4	1 : 1
Sandell’s sensitivity (𝜇g cm^−2 per 0.001 absorbance unit)	0.088
Regression equation^a	A = 0.0209C + 0.024
Correlation coefficient, 𝑅^2	0.9998

aA = mC + b, where A is the absorbance and C is the concentration in 𝜇g mL⁻¹.