Abstract
This work presents a new electrochemical sensor based on poly(l-alanine) (l-Ala) (as a conducting polymer), and gold nanoparticles (AuNPs) coated with a pre-anodized pencil graphite electrode (pre-PGE). Electrosynthesis, preparation, and sensor characterization were studied by cyclic voltammetry, electrochemical impedance spectroscopy, and energy dispersive X-ray spectroscopy. Electrocatalytic activities of the sensor (AuNPs/poly(l-Ala)/pre-PGE) were compared with pre-PGE, poly(l-Ala)/pre-PGE. This polymer–nanoparticles-modified electrode was evaluated to determine olanzapine (OLA) by differential pulse voltammetry in Britton–Robinson buffer solution. The effect of each nanomaterial and pH was tested to investigate sensor performance. OLA's oxidation peak (0.850 V) was found linearly in the range of 0.271–1000.0 µM with a detection limit of 0.081 μM. The analytical applicability of the sensor was successfully carried out in pharmaceutical dosage forms, human urine, and human serum. Moreover, the electrochemical oxidation mechanism of the antipsychotic drug OLA was studied using cyclic voltammetry to understand its action mechanism and side effect.
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The samples used were taken from the authors of this work in our laboratory conditions.
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The authors are grateful for the financial support provided by the Ankara University Research Fund (project numbers FDK-2022-2501, 20L0430001, and 20B0430003).
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Tüzün, Ü.N., Yıldız, C., Eskiköy Bayraktepe, D. et al. Electrochemical fabrication of poly(l-alanine)-gold nanoparticle nanocomposite-modified electrode: application for determination and mechanism of antipsychotic drug olanzapine. Monatsh Chem 154, 95–104 (2023). https://doi.org/10.1007/s00706-022-03012-9
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DOI: https://doi.org/10.1007/s00706-022-03012-9