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Wang M, Hu B, Yang C, Zhang Z, He L, Fang S, Qu X, Zhang Q. Electrochemical biosensing based on protein-directed carbon nanospheres embedded with SnO x and TiO 2 nanocrystals for sensitive detection of tobramycin. Biosens Bioelectron 2017; 99:176-185. [PMID: 28756323 DOI: 10.1016/j.bios.2017.07.059] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 07/23/2017] [Accepted: 07/24/2017] [Indexed: 01/03/2023]
Abstract
A series of nanocomposites comprised of homogeneous mesoporous carbon nanospheres embedded with SnOx (x = 0, 1, or 2) and TiO2 nanocrystals using bovine serum albumin (BSA) as template followed by calcinated at different temperatures (300, 500, 700, and 900°C) were prepared, and were denoted as SnOx@TiO2@mC. Then a novel electrochemical biosensing strategy for detecting tobramycin (TOB) based on the nanocomposites was constructed. The as-prepared SnOx@TiO2@mC nanocomposites not only possess high specific surface area and good electrochemical activity but also exhibit strong bioaffinity with the aptamer strands, therefore, they were applied as the scaffold for anchoring TOB-targeted aptamer and further used to sensitively detect trace TOB in aqueous solutions. By comparing the electrochemical biosensing responses toward TOB detection based on the four SnOx@TiO2@mC nanocomposites, the biosensing system constructed with SnOx@TiO2@mC900 (derived at 900°C) demonstrated the highest determination efficiency, high selectivity, and good stability. In particular, the new proposed aptasensing method based on SnOx@TiO2@mC nanocomposite exhibits considerable potential for the quantitative detection of TOB in the biomedical field.
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Affiliation(s)
- Minghua Wang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China; Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Bin Hu
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Chuang Yang
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Zhihong Zhang
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
| | - Linghao He
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Shaoming Fang
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Materials and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Xiongwei Qu
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
| | - Qingxin Zhang
- School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
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HU W, ZHANG J, KONG J. Fluorescence Detection of DNA Based on Non-covalent π-π Stacking Interaction between 1-Pyrenebutanoic Acid and Hypericin. ANAL SCI 2016; 32:523-7. [DOI: 10.2116/analsci.32.523] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Weiwen HU
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology
| | - Jian ZHANG
- Laboratory of Translational Medicine, Jiangsu Province Academy of Traditional Chinese Medicine
| | - Jinming KONG
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology
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A Label-Free Impedimetric DNA Sensor Based on a Nanoporous SnO₂ Film: Fabrication and Detection Performance. SENSORS 2015; 15:10686-704. [PMID: 25954951 PMCID: PMC4481975 DOI: 10.3390/s150510686] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 04/27/2015] [Accepted: 05/04/2015] [Indexed: 11/28/2022]
Abstract
Nanoporous SnO2 thin films were elaborated to serve as sensing electrodes for label-free DNA detection using electrochemical impedance spectroscopy (EIS). Films were deposited by an electrodeposition process (EDP). Then the non-Faradic EIS behaviour was thoroughly investigated during some different steps of functionalization up to DNA hybridization. The results have shown a systematic decrease of the impedance upon DNA hybridization. The impedance decrease is attributed to an enhanced penetration of ionic species within the film volume. Besides, the comparison of impedance variations upon DNA hybridization between the liquid and vapour phase processes for organosilane (APTES) grafting on the nanoporous SnO2 films showed that vapour-phase method is more efficient. This is due to the fact that the vapour is more effective than the solution in penetrating the nanopores of the films. As a result, the DNA sensors built from vapour-treated silane layer exhibit a higher sensitivity than those produced from liquid-treated silane, in the range of tested target DNA concentration going to 10 nM. Finally, the impedance and fluorescence response signals strongly depend on the types of target DNA molecules, demonstrating a high selectivity of the process on nanoporous SnO2 films.
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