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

Table 4

Determination of AMD and COX from formulation mixture and tablets.

	Formulation ratio (mg/Tab)	First derivative method		Second method
		% Recovery		% Recovery
		Formulation mixture	Tablets	Formulation mixture	Tablets
AMD	10	98.41	98.54	99.08	98.55
COX	200	99.29	101.87	98.90	99.03
AMD	5	99.21	101.08	100.36	100.89
COX	200	98.58	98.14	98.49	101.38
AMD	2.5	98.70	100.98
COX	200	101.37	98.06