Development of UV Spectrophotometric Procedures for Determination of Amlodipine and Celecoxib in Formulation: Use of Scaling Factor to Improve the Sensitivity

Figure 10

Calibration curves of AML 0.5 to 10 μg/ml, first derivative method (a), 1 to 10 μg/ml in second method (normal absorption at 363.4 nm) (c), COX 5 to 40 μg/ml, first derivative method (b), and second method (first derivative of ratio spectra) (d).

(a)

(b)

(c)

(d)