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Indirect Spectrophotometric Determination of Propranolol Hydrochloride and Piroxicam in Pure and Pharmaceutical Formulations

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Abstract

Two simple and sensitive indirect spectrophotometric methods for the assay of propranolol hydrochloride (PPH) and piroxicam (PX) in pure and pharmaceutical formulations have been proposed. The methods are based on the oxidation of PPH by a known excess of standard N-bromosuccinimide (NBS) and PX by ceric ammonium sulfate (CAS) in an acidic medium followed by the reaction of excess oxidant with promethazine hydrochloride (PMH) and methdilazine hydrochloride (MDH) to yield red-colored products. The absorbance values decreased linearly with increasing concentration of the drugs. The systems obeyed Beer’s law over the concentration ranges of 0.5–12.5 and 0.3–16.0 µg/ml for PPH, and 0.4–7.5 and 0.2–10 µg/ml for PX with PMH and MDH, respectively. Molar absorptivity values, as calculated from Beer’s law data, were found to be 1.36 × 104 and 2.55 × 104 l mol–1 cm–1 for PPH, and 2.08 × 104 and 2.05 × 104 l mol–1 cm–1 for PX with PMH and MDH, respectively. The common excipients and additives did not interfere with their determinations. The proposed methods have been successfully applied to the determinations of PPH and PX in various dosage forms. The results obtained by the proposed methods compare favorably with those of official methods.

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Authors and Affiliations

  1. Department of Chemistry, Karnatak University, Dharwad, 580 003, India

    Babu G. Gowda, Jaldappa Seetharamappa & Mahaveer B. Melwanki

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  1. Babu G. Gowda
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  2. Jaldappa Seetharamappa
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  3. Mahaveer B. Melwanki
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Correspondence to Jaldappa Seetharamappa.

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Gowda, B.G., Seetharamappa, J. & Melwanki, M.B. Indirect Spectrophotometric Determination of Propranolol Hydrochloride and Piroxicam in Pure and Pharmaceutical Formulations. ANAL. SCI. 18, 671–674 (2002). https://doi.org/10.2116/analsci.18.671

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