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Debalkie A, Guadie A, Kassa A, Tefera M. Selective Determination of Norfloxacin in Pharmaceutical Formulations and Human Urine Samples Using Poly(8-aminonaphthaline-2-sulfonic Acid)-Modified Glassy Carbon Electrodes. ACS OMEGA 2023; 8:25758-25765. [PMID: 37521652 PMCID: PMC10372944 DOI: 10.1021/acsomega.3c00805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 06/26/2023] [Indexed: 08/01/2023]
Abstract
In this study, a glassy carbon electrode was modified potentiodynamically with poly(8-aminonaphthaline-2-sulfonic acid) [poly(ANSA)/GCE] for the detection of norfloxacin (NFN) in tablet formulations and human urine samples. Improvement of the effective surface area of the modified electrode and decreased charge-transfer resistance confirmed surface modification of the GCE by a conductive poly(ANSA) film. The appearance of an oxidative peak without a reductive peak in the reverse scan direction showed the irreversibility of the electrochemical oxidation of NFN in both the bare GCE and poly(ANSA)/GCE. A better coefficient of determination for the peak current on the square root of the scan rate (R2 = 0.99514) than the scan rate (R2 = 0.97109), indicating the oxidation of NFN at the poly(ANSA)/GCE, was predominantly diffusion mass transport-controlled. Under optimized pH and square wave parameters, the voltammetric current response of NFN at the poly(ANSA)/GCE showed linear dependence on the concentration, ranging from 1.0 × 10-8 to 4.0 × 10-4 M with a limit of detection of 4.1 × 10-10. The NFN level in the studied tablet brands was in the range of 90.30-103.3% of their labeled values. Recovery results in tablet and urine samples ranged from 98.35 to 101.20% and 97.75 to 99.60%, respectively, and interference recovery results were less than 2.13% error in the presence of ampicillin, chloroquine phosphate, and cloxacillin. The present method had a better performance for the determination of NFN in tablet formulations and urine samples as compared with recently reported voltammetric methods due to its requirement of a simple electrode modification step, which provides the least limit of detection and a reasonably wider linear dynamic range.
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Affiliation(s)
- Ameha Debalkie
- Department
of Chemistry, College of Science, University
of Gondar, Gondar 196, Ethiopia
| | - Atnafu Guadie
- Department
of Chemistry, College of Science, University
of Gondar, Gondar 196, Ethiopia
| | - Adane Kassa
- Department
of Chemistry, College of Natural and Computational Sciences, Debre Markos University, Debre Markos 269, Ethiopia
- Department
of Chemistry, College of Science, Bahir
Dar University, Ethipia 79, Ethiopia
| | - Molla Tefera
- Department
of Chemistry, College of Science, University
of Gondar, Gondar 196, Ethiopia
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Tefera M, Tessema M, Admassie S, Ward M, Phelane L, Iwuoha EI, Baker PG. Electrochemical application of cobalt nanoparticles-polypyrrole composite modified electrode for the determination of phoxim. Anal Chim Acta X 2021; 9:100077. [PMID: 34622198 PMCID: PMC8482437 DOI: 10.1016/j.acax.2021.100077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 09/17/2021] [Accepted: 09/18/2021] [Indexed: 11/10/2022] Open
Abstract
In this study, cobalt nanoparticles (CoNPs) were synthesized and cobalt nanoparticles modified glassy carbon electrode (CoNPs/GCE) was prepared by drop coating the nanoparticles on glassy carbon electrode. After preparing polypyrrole modified glassy carbon electrode (PPy/GCE) using electropolymerization of pyrrole in LiClO4 solution, cobalt nanoparticles-polypyrrole composite modified glassy carbon electrode (CoNPs/PPy/GCE) was fabricated by drop coating the CoNPs on the PPy/GCE. Different characterization techniques such as scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, FTIR spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to study the morphological structure and electrochemical behavior of the sensors. The results demonstrated that PPy chains interacted with CoNPs through donor-acceptor bonds. Among all the electrodes, CoNPs/PPy/GCE exhibited highest electroactive surface area and lowest electron transfer resistance towards phoxim. Under the optimal conditions, the sensor showed linear relationship between the reduction peak current and the concentration of phoxim in the range of 0.025 μM-12 μM with the detection limit as 4.5 nM. Besides, the composite electrode demonstrated excellent reproducibility, good stability and selectivity towards the possible interfering substances. All of these properties made CoNPs/PPy/GCE a suitable electrochemical sensor for the electrochemical determination of phoxim in water samples using square wave voltammetry.
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Affiliation(s)
- Molla Tefera
- Department of Chemistry, University of Gondar, P. O. Box 196, Gondar, Ethiopia
| | - Merid Tessema
- Department of Chemistry, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia
| | - Shimelis Admassie
- Department of Chemistry, Addis Ababa University, P. O. Box 1176, Addis Ababa, Ethiopia
| | - Meryck Ward
- Sensor Lab, Department of Chemistry, University of the Western Cape, Private Bag X17, Robert Sobukwe Drive, Bellville, 7535, South Africa
| | - Lisebo Phelane
- Sensor Lab, Department of Chemistry, University of the Western Cape, Private Bag X17, Robert Sobukwe Drive, Bellville, 7535, South Africa
| | - Emmanuel I. Iwuoha
- Sensor Lab, Department of Chemistry, University of the Western Cape, Private Bag X17, Robert Sobukwe Drive, Bellville, 7535, South Africa
| | - Priscilla G.L. Baker
- Sensor Lab, Department of Chemistry, University of the Western Cape, Private Bag X17, Robert Sobukwe Drive, Bellville, 7535, South Africa
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Green synthesis of silver nanoparticle using goniothalamus wightii on graphene oxide nanocomposite for effective voltammetric determination of metronidazole. SENSING AND BIO-SENSING RESEARCH 2021. [DOI: 10.1016/j.sbsr.2021.100425] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Electrochemical Determination of Ciclopirox Olamine by Using Boron-Doped Diamond Electrode Modified with Overoxidized Polypyrrole Film. Electrocatalysis (N Y) 2021. [DOI: 10.1007/s12678-021-00651-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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