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Flow Injection Detection of Tetracyclines by Electrocatalytic Oxidation at a Nickel-modified Glassy Carbon Electrode


Oungpipat, W and Alexander, PW and Southwell-Keely, P, Flow Injection Detection of Tetracyclines by Electrocatalytic Oxidation at a Nickel-modified Glassy Carbon Electrode, Analyst, 120, (5) pp. 1559-1565. ISSN 0003-2654 (1995) [Refereed Article]

DOI: doi:10.1039/an9952001559


The electrocatalytic oxidation of tetracyclines in an alkaline solution at a nickel-modified glassy carbon electrode was investigated. The response of the modified electrode was characterized by voltammetry and flow injection. Subsequently, it was used for amperometric detection of tetracyclines in a flow injection system. The preparation of the modified electrode is carried out by simple deposition of NiII solution onto the glassy carbon-based electrode. The detection is based on the measurement of anodic current generated by the catalytic oxidation of the antibiotics at the surface of the electrode through the formation of a high-valent, oxyhydroxide species (NiOOH) at +550 V (versus Ag/AgCl). The modified electrode offers a stable and reproducible catalytic oxidation current for these antibiotics without recourse to pulsed waveform potential. Rapid quantification at the mg 1-1 (ppm) level is achieved. Standard calibration graphs for tetracycline, doxycycline, oxytetracycline and chlortetracycline yielded linear ranges of 2.5-80, 2.5-100, 2.5-100 and 2.5-100 mg l-1, respectively. Detection limits (S/N = 3) of (0.03, 0.92, 0.34 and 1.81 mg l-1 were obtained for tetracycline, doxycycline, oxytetracycline and chlortetracycline, respectively. The electrode was applied for the determination of the four antibiotics in single-component drug formulations.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Instrumental methods (excl. immunological and bioassay methods)
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Alexander, PW (Professor Peter Alexander)
ID Code:5556
Year Published:1995
Web of Science® Times Cited:27
Deposited By:Applied Science
Deposited On:1995-08-01
Last Modified:2011-08-24

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