Electrochemical determination of sulfamethazine using a gold electrode modified with multi-walled carbon nanotubes, graphene oxide nanoribbons and branched aptamers
- 18 April 2020
- journal article
- research article
- Published by Springer Science and Business Media LLC in Microchimica Acta
- Vol. 187 (5), 1-9
- https://doi.org/10.1007/s00604-020-04244-4
Abstract
An aptasensor assay for sulfamethazine is introduced based on a gold electrode modified with multi-walled carbon nanotubes@graphene oxide nanoribbons (MWCNTs@GONRs) nanocomposites. The MWCNTs@GONRs nanocomposites were synthesized by a chemical longitudinal partially unzipping method. Its properties are characterized by scanning electron microscope (SEM), energy dispersive spectrometric analysis (EDS), transmission electron microscope (TEM) and X-ray diffraction (XRD). In the presence of sulfamethazine, the conformation of the aptamer changes and a G-quadruplex structure is formed. It inhibits the electron transfer of the redox probe [Fe(CN)6]3−/4− on the electrode surface, causing weakening of the peak current response at the peak potential of 0.17 V (vs. Ag/AgCl). Using differential pulse voltammetry, a linear response was obtained for sulfamethazine concentrations in the range 0.01 ~ 50 ng mL−1 with a detection limit of 5.2 pg mL−1. Schematic representation of an electrochemical aptasensor for sulfamethazine determination. A gold electrode is modified with multi-walled carbon nanotubes@graphene oxide nanoribbons to improve the electrode performance. When the aptamer binds to sulfamethazine to form G-quadruplex, the peak current response decreases.Funding Information
- National Natural Science Foundation of China (61301037)
- Program for Science and Technology Innovation Talents in Universities of Henan Province (20HASTIT002)
- Cultivation Plan for Young Core Teachers in Universities of Henan Province (2017GGJS072)
- National Engineering Laboratory for Wheat & Corn Further Processing, Henan University of Technology (NL2018004)
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