April 2012

About Authors:
Megana.H.S*, A.Satish Kumar Shetty, Anil Kumar S.M
*Department of Pharmaceutical Analysis,
National College of Pharmacy, Balraj Urs road,
Shimoga-577201,
Karnataka, India.
megana.leo@gmail.com

ABSTRACT
A novel, accurate, precise, sensitive, economic and rapid spectrophotometric methods has been developed and validated for simultaneous estimation of Triamterene and Benzthiazide in bulk and pharmaceutical dosage form. Triamterene and Benzthiazide showed absorption maxima at 363 nm and 283 nm in ethanol, which is used as solvent. In the present study, Area Under Curve method (Method A) developed, employedthe measurement of area at selected analytical wavelength ranges. Two analytical wavelength ranges selected were 358nm to 368nm nm (lmax of Triamterene is 363nm) and 278nm to 288nm (lmax of Benzthiazide is 283nm) for the estimation of Triamterene and Benzthiazide respectively.  Ratio derivative method (Method B) employed the measurement of amplitudes of Triamterene and Benzthiazide at their respective selected wavelengths. Two wavelengths selected were 359.2 nm and 300.4 nmfor the estimation of Triamterene and Benzthiazide respectivelybased upon divisor method.  Linearity was observed in the concentration range of 6-30 μg/ml and 3-15 μg/ml for Triamterene and Benzthiazide respectively. The recovery studies ascertained the accuracy of the proposed method and the results were validated as per ICH guidelines.

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