期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 131, 期 -, 页码 1155-1161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijbiomac.2019.04.068
关键词
Chitosan; Modified electrodes; Carbon paste electrode; Differential pulse voltammetry; Electroanalysis; 4-Nitroaniline
A sensitive, selective and reproducible electrochemical method has been established for the electroanalysis of 4-nitroaniline (4-NA) using a carbon paste electrode modified with a chitosan solution gelled in acetic acid (CS@CPE). The modified electrode was then characterized spectroscopically using Fourier Transform Infrared (FTIR) spectroscopy. In addition, the electrochemical and interfacial characteristics of the as-prepared modified electrode were assessed by potentiodynamic cyclic voltammetry (CV) and AC electrochemical impedance spectroscopy (EIS). Differential pulse voltammetry (DPV) was additionally used to deduce the trace amounts of (4-NA) in phosphate buffered saline (PBS) of pH 7.0 as an ideal electrolyte. Under optimized conditions, the peak current of 4-NA increased linearly with the increasing 4-NA concentration over the range of 0.1 mu M to 0.1 Mm. The calibration curve presents two linear ranges of current versus 4-NA concentration with a detection limit of 93.4 nM (3sb / B). The repeatability of the current peak registered at CS@CPE was performed at a level of 0.5 mu M 4-NA employing one sensor on the same day for eight measurements. The relative standard deviation was 3.5%. (C) 2019 Elsevier B.V. All rights reserved.
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