Journal
BIOSENSORS & BIOELECTRONICS
Volume 135, Issue -, Pages 88-94Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.03.062
Keywords
Label-free; PEC aptasensor; MIL-68(In)-NH2/MWCNT/CdS; Tetracycline; Metal-organic frameworks
Categories
Funding
- National Natural Science Foundation of China [21505051, 21575050, 21777056]
- National Key Scientific Instrument and Equipment Development Project of China [21627809]
- Key Research and Development Program of Shandong Province [2016GSF117002]
- Shandong Provincial Natural Science Foundation [ZR2016BQ12]
- Special project of independent innovation and achievements transformation of Shandong Province [2014ZZCX05101]
- Special Foundation for Taishan Scholar Professorship of Shandong Province [ts20130937]
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It is essential to develop a highly efficient detection platform for tetracycline (Tc). Herein, based on well-designed hierarchical MIL-68(In)-NH2/MWCNT/CdS composites as a highly efficient transducer, a label-free visible light driven photoelectrochemical (PEC) aptasensor was systematically fabricated. Characterization results indicate that the forming of MIL-68(In)-NH2/CdS heterojunction remarkable facilitated the transfer and inhibited the recombination of charge carriers. Moreover, the transfer properties of multiwalled carbon nanotubes (MWCNTs) further improved the photoelectric conversion efficiency by adjusting electron transport routes. The aptamer as a biorecognition unit was grafted on the modified electrode by chemical bonding effect, and Tc molecules could be captured through the specific interaction of aptamer and Tc in solution. The concentration of Tc was detected by observing the fluctuation of photocurrent signals. Under optimized conditions, the proposed aptasensor showed the broad linear range from 0.1 nmol L(-1 )to 1 mu mol L-1 with a low detection limit (LOD) of 0.015 nmol L-1. Furthermore, the high sensitivity, excellent reproducibility and favorable stability of the PEC sensing platform indicated the potential applications for antibiotic residues detecting in environmental media.
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