Nanocomposite of ferricyanide-doped chitosan with multi-walled carbon nanotubes for simultaneous senary detection of updates redox-active biomolecules

摘要

The synthesis of a novel nanocomposite that contains ferricyanide-doped chitosan and multi-walled carbon nanotubes (FC/Chi-MWCNTs) is reported here for the first time, to the best of our knowledge. A graphite paste electrode (GPE) with the incorporation of FC/Chi-MWCNT nanocomposite was fabricated for the simultaneous electrochemical determination of six redox-active biomolecules; ascorbic acid (AA), dopamine (DA), uric acid (UA), tryptophan (Trp), xanthine (XA) and caffeine (CA). The differential pulse voltammetric measurements were performed in 0.10 M phosphate buffer solution at pH 4.0. The MGPE displayed a strong, stable and continuous six well-separated oxidation peaks towards electrooxidation at potentials 0.15, 0.30, 0.45, 0.75, 0.85, and 1.34 V for AA, DA, UA, Trp, XA and CA, respectively. The calibration curves were linear up to 2056.8, 94.1, 193.7, 198.9, 191.3, 2.4 mu M with a limit of detection of 5.3 mu M, 1.1, 2.7, 3.7, 7.3 nM, 2.2 mu M for AA, DA, UA, Trp, XA and CA, respectively. The analytical performance of the FC/Chi-MWCNT-modified electrodes has been evaluated using human serum and urine samples with recoveries of 9425-115%. Thus, we concluded that the synthesized FC/Chi-MWCNT-nanocomposites provided a promising electrochemical platform for development into routine clinical applications. (C) 2019 Elsevier B.V. All rights reserved.