NDLI: Modification of a disposable pencil graphite electrode with multiwalled carbon nanotubes: application to electrochemical determination of diclofenac sodium in some pharmaceutical and biological samples

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Analytical Methods Vol - 8 Issue - 9

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Modification of a disposable pencil graphite electrode with multiwalled carbon nanotubes: application to electrochemical determination of diclofenac sodium in some pharmaceutical and biological samples

Content Provider	Royal Society of Chemistry (RSC)
Author	Fard, Golnaz Parvizi Sabzi, Reza Emam Ali Alipour, Esmaeel
Copyright Year	2016
Abstract	A pencil graphite electrode (PGE) modified by multiwalled carbon nanotubes (MWCNTs) was developed as an electrochemical sensor and used for the determination of diclofenac sodium (DIC). The morphological and interfacial properties of the modified electrode were characterized by scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS) techniques, respectively. Various strategies for modification of the PGE by MWCNTs were examined and concluded that the drop coating of a non-treated PGE (NPGE) has the best performance. In the following, various parameters which affect the electrochemical performance of the modified electrode toward diclofenac sodium determination such as the pH of buffer solution, type and concentration of buffer solution, and amount of MWCNTs on the electrode surface were studied. Differential pulse voltammetry (DPV) was used for the determination of DIC. Under optimized conditions, a calibration graph was plotted by the variation of anodic peak currents as a function of DIC concentration in the linear range of 0.047–12.95 μM with a detection limit of 0.017 μM (S/N = 3). The MWCNTs/PGE was used for the determination of DIC in real samples, including pharmaceutical and biological samples, and the good accuracy of the modified electrode was confirmed by acceptable recovery values.
Starting Page	3966
Ending Page	3974
Page Count	9
File Format	HTM / HTML PDF
ISSN	17599660
Volume Number	8
Issue Number	19
Journal	Analytical Methods
DOI	10.1039/c6ay00441e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Electrode Buffer solution Scanning electron microscope Diclofenac Graph of a function Carbon nanotube Platinum group Graphite Electrochemistry PH Differential pulse voltammetry DIC Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Analytical Chemistry Engineering Chemical Engineering

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Modification of a disposable pencil graphite electrode with multiwalled carbon nanotubes: application to electrochemical determination of diclofenac sodium in some pharmaceutical and biological samples