Tefera, MollaTessema, MeridAdmassie, ShimelisIwuoha, Emmanuel I.Waryo, Tesfaye T.Baker, Priscilla G.L.2019-10-292019-10-292018Tefera, M., Tessema, M., Admassie, S., Iwuoha, E., Waryo, T., & Baker, P. (2018). Electrochemical determination of phenothrin in fruit juices at graphene oxide-polypyrrole modified glassy carbon electrode. Sensing And Bio-Sensing Research, 21, 27-34. doi: 10.1016/j.sbsr.2018.09.0032214-1804https://doi.org/10.1016/j.sbsr.2018.09.003http://hdl.handle.net/10566/5066An electrochemical sensor was developed based on graphen oxide-polypyrrole modified glassy carbon electrode (GO/PPy/GCE) for sensitive determination of phenothrin in fruit samples. GO/PPy/GCE was characterized by scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet-Visible spectroscopy (UV–Vis) and Raman spectroscopy. The sensor was also characterized using electrochemical impedance spectroscopy and cyclic voltammetry. Compared to bare GCE, GO/GCE and PPy/GCE, the reduction peak current of phenothrin increased significantly at GO/PPy/GCE, demonstrating that GO/PPy/GCE exhibited electrocatalytic activity towards the reduction of phenothrin. Under the optimal conditions, the sensor showed a linear relationship over the range of 2.5×10−8-2.0×10−5 M with detection limits of 13.8×10−9 M. In addition, the analytical application of the proposed method was carried out by the determination of phenothrin in fruit juice samples.enPhenothrinGraphene oxide-polypyrroleSensorFruit juicesArticle