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Spectrophotometric Determination of Metoprolol Tartrate in Pharmaceutical Dosage Forms on Complex Formation with Cu(II)

Department of Chemistry, Faculty of Science and Arts, University of Kahramanmaraş Sütçü Imam, Campuse of Avsar, 46100, Kahramanmaras, Turkey
Author to whom correspondence should be addressed.
Pharmaceuticals 2011, 4(7), 964-975;
Received: 10 March 2011 / Revised: 27 April 2011 / Accepted: 18 May 2011 / Published: 28 June 2011
(This article belongs to the Special Issue Betablockers)
PDF [262 KB, uploaded 28 June 2011]


A new, simple, sensitive and accurate spectrophotometric method has been developed for the assay of metoprolol tartrate (MPT), which is based on the complexation of drug with copper(II) [Cu(II)] at pH 6.0, using Britton-Robinson buffer solution, to produce a blue adduct. The latter has a maximum absorbance at 675 nm and obeys Beer’s law within the concentration range 8.5-70 mg/mL. Regression analysis of the calibration data showed a good correlation coefficient (r = 0.998) with a limit of detection of 5.56 mg/mL. The proposed procedure has been successfully applied to the determination of this drug in its tablets. In addition, the spectral data and stability constant for the binuclear copper(II) complex of MPT (Cu2MPT2Cl2) have been reported. View Full-Text
Keywords: b-blockers; metoprolol; complexation; spectrophotometry b-blockers; metoprolol; complexation; spectrophotometry
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Cesme, M.; Tarinc, D.; Golcu, A. Spectrophotometric Determination of Metoprolol Tartrate in Pharmaceutical Dosage Forms on Complex Formation with Cu(II). Pharmaceuticals 2011, 4, 964-975.

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