Vesna Antunović, Rada Baošić and Aleksandar Lolić* Pages 1 - 6 ( 6 )
Background: Diazepam belongs to the group of 1,4-benzodiapines. It is used for the treatment of anxiety, convulsions and as a muscle relaxant. The presence of 4,5-azomethine group enables its electrochemical detection.
Introduction: A screen-printed electrode modified with antimony film was used for the determination of diazepam in pharmaceutical preparations
Methods: Electrode modification was done by ex-situ deposition of antimony on commercially available screen-printed electrode. Parameters affecting the electroanalytical response of the sensor, such as deposition potential, deposition time, and antimony concentration, were examined and optimized. The modified electrode showed enhanced electroactivity for diazepam reduction compared to unmodified electrode. Under optimal conditions, linear sweep voltammetry was used for the determination of analyte.
Results: The sensor showed linear dependence in the range from 0.5 to 10 μmol/L, the correlation coefficient was 0.9992. The limit of detection was 0.33 μmol/L, corresponding limit of quantification was 1.08 μmol/L. Modification enabled determination of diazepam in the presence of oxygen.
Conclusion: The modified electrode was used for the determination of diazepam in tablets. Results confirmed the applicability of the electrochemical sensor.
Diazepam determination, antimony film electrode, screen-printed electrode, linear sweep voltammetry
Department of Pharmacy, Faculty of Medicine, University of Banja Luka, Banja Luka, Department of Analytical Chemistry, University of Belgrade-Faculty of Chemistry, Belgrade, Department of Analytical Chemistry, University of Belgrade-Faculty of Chemistry, Belgrade