Figure 3From: Application of smart spectrophotometric methods and artificial neural network for the simultaneous quantitation of olmesartan medoxamil, amlodipine besylate and hydrochlorothiazide in their combined pharmaceutical dosage form (a) Ratio spectrum of laboratory prepared mixture of 7 μg mL -1 AML (Y) and 25 μg mL -1 OLM + 10 μg mL -1 HCT (X) using normalized AML (Y') as a divisor and acetonitrile as a blank (b) the same spectrum after subtraction of constant (c) the same spectrum after subtraction of constant then multiplication by the divisor (Y’). Back to article page