Title:Silk Derived Fe/N-Doping Porous Carbon Nanosheets for Chloramphenicol Electrochemical Detection
Volume: 18
Issue: 9
Author(s): Wenzhuo Chang, Yongxi Zhu, Yongjun Ma*, Zhixiang Zheng*Chunming Wang
Affiliation:
- Key Laboratory of Bioelectrochemistry and Environmental Analysis of Gansu Province, College of Chemistry & Chemical
Engineering, Northwest Normal University, Lanzhou 730070, China
- Key Laboratory of Evidence Science Techniques
Research and Application of Gansu Province, Gansu University of Political Science and Law, Lanzhou 730070,
China
Keywords:
Silk, biomass carbon nanostructures, chloramphenicol, surface modification, electrochemical analysis, severe aplastic anemia.
Abstract:
Background: The use of modified electrochemical sensors is essential for the detection of antibiotic
drug abuse. The main objective of this article is to develop a silk-derived carbon material for the modification
of pyrolytic graphite electrodes (PGE) for the sensitive detection of chloramphenicol (CAP).
Methods: We proposed a pyrolysis synthesis of porous carbon nanosheets (Fe-Silk PNC) using silk as a
precursor. Properties of carbon nanosheets had been improved by the Fe-Nx atoms doping, which was
attributed to the β-sheet structures and amino-group-rich chemical structures of silk fibroin, and this material
has been used to modify the pyrolytic graphite electrode (PGE) for the electrochemical determination
of CAP. Scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FT-IR)
were used to determine the morphology and properties of Fe-Silk PNC surface. In the electrochemical
determination, cyclic voltammetry (CV) showed a superior current response while bare electrode performed
an inferior result. In addition, different scan rate, pH, accumulation time and accumulation potential
were carefully optimized, which proved that this material is appropriate for CAP detection. Finally,
differential pulse voltammetry (DPV) method was used for quantitative measurements.
Results: In this study, DPV determination of CAP showed the linear relationship with increasing concentration
ranged from 1 to 200 μM, and the low detection limit was 0.57 μM (S/N = 3). SEM and FT-IR
results further demonstrated the N-doped carbon nanomaterials were successfully synthesized. With excellent
sensing performance achieved, the practicability of the sensor has been evaluated to detect CAP in
chicken, shrimps and fish.
Conclusion: In summary, a silk derived biomass porous carbon nanomaterial Fe-Silk PNC was simply
fabricated and used as a novel electrode material. This kind of novel Fe-Silk PNC modified electrode
exhibited excellent sensitivity, anti-interference ability, repeatability, wide linear rang, and was successfully
used for determination of CAP in real samples. Therefore, the biomass derived nanomaterial is expected
to be used in new sensing materials.