期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 236, 期 -, 页码 126-135出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.05.086
关键词
Norepine phrine; Self-assembled monolayers; Gold nanoparticles; Multi-walled carbon nanotubes; Electrochemical sensor
资金
- Science Foundation Ireland (SFI) for Irish Separation Science Cluster (ISSC) [08/SRC/B1412]
- Development and Promotion of Science and Technology Talent Projects (DPST)
A novel electrochemical sensor consisting of L-cysteine self-assembled monolayers over gold nanoparticles/multi-walled carbon nanotubes modified glassy carbon electrode (L-Cys/AuNPs/MWCNTs/GCE) was fabricated and applied for the determination of norepinephrine(NE) in the presence of sodium dodecyl sulfate (SDS) for the first time. Electroanalytical measurements including cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used. The optimum buffer of pH 5.0 contained 30 mu M SDS, the NE oxidation peak current enhanced linearly with concentration ranging from 0.2 to 100 mu M (R-2 of 0.9998) with a detection limit of 0.03 mu M. In the presence of SDS, the modified L-Cys/AuNPs/MWCNTs/GCE electrode showed high selectivity for the detection of NE in the presence of ascorbic acid and uric acid. High recoveries in the range of 80.7-100.2% were obtained in spiked human serum samples. Our modified electrode displayed a high reproducibility, sensitivity and long term stability. (C) 2016 Elsevier B.V. All rights reserved.
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