Abstract
Peroxynitrite anion (ONOO−) is an important in vivo oxidative stress biomarker whose aberrant levels have pathophysiological implications. In this study, an electrochemical sensor for ONOO− detection was developed based on graphene nanoplatelets-cerium oxide nanocomposite (GNP-CeO2) incorporated polyaniline (PANI) conducting hydrogels. The nanocomposite-hydrogel platform exhibited distinct synergistic advantages in terms of large electroactive surface coverage and providing a conductive pathway for electron transfer. Besides, the 3D porous structure of hydrogel integrated the GNP-CeO2 nanocomposite to provide hybrid materials for the evolution of catalytic activity towards electrochemical oxidation of ONOO−. Various microscopic and spectroscopic characterization techniques endorsed the successful formation of GNP-CeO2-PANI hydrogel. Cyclic voltammetry (CV) measurements of GNP-CeO2-PANI hydrogel modified screen-printed electrodes (SPE) were carried out to record the current changes influenced by ONOO−. The prepared sensor demonstrated a significant dose-dependent increase in CV peak current within a linear range of 5–100 µM (at a potential of 1.12 V), and a detection limit of 0.14 with a sensitivity of 29.35 ± 1.4 μA μM−1. Further, a customized microfluidic flow system was integrated with the GNP-CeO2-PANI hydrogel modified SPE to enable continuous electrochemical detection of ONOO− at low sample volumes. The developed microfluidic electrochemical device demonstrated an excellent sensitivity towards ONOO− under optimal experimental conditions. Overall, the fabricated microfluidic device with hybrid hydrogels as electrochemical interfaces provides a reliable assessment of ONOO− levels. This work offers considerable potential for understanding the oxidative stress–related disease mechanisms through determination of ONOO− in biological samples.
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Acknowledgements
We would like to sincerely thank Science and Engineering Research Board (No. ECR/2018/000199/ES), Council of Scientific & Industrial Research (CSIR-MLP 2006), and Department of Science and Technology (DST/INSPIRE/04/2016/002181), Government of India for providing the financial support for this work. Authors are thankful to CSIR-CSIO, Chandigarh for providing the access to various analytical facilities required for this work.
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Kumar, V., Matai, I., Kumar, A. et al. GNP-CeO2- polyaniline hybrid hydrogel for electrochemical detection of peroxynitrite anion and its integration in a microfluidic platform. Microchim Acta 188, 436 (2021). https://doi.org/10.1007/s00604-021-05105-4
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DOI: https://doi.org/10.1007/s00604-021-05105-4