Electrochemical determination of phenothrin in fruit juices at graphene oxide-polypyrrole modified glassy carbon electrode
Date
2018Author
Tefera, Molla
Tessema, Merid
Admassie, Shimelis
Iwuoha, Emmanuel I.
Waryo, Tesfaye T.
Baker, Priscilla G.L.
Metadata
Show full item recordAbstract
An 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.