期刊
BIOSENSORS & BIOELECTRONICS
卷 180, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2021.113146
关键词
Ochratoxin A; Paper-based analytical device; Electrochemical; colorimetric signal; Aptasensor
类别
资金
- Key Project of CAS [KFJ-STS-ZDTP-083]
- Dalian Youth Science and Technology Star Project [2019RQ071]
This study developed a novel paper-based analytical device for detecting Ochratoxin A, achieving dual-mode detection using a synthesized functional material to greatly enhance sensitivity. The device integrates visual and electrochemical signal output, providing a cost-effective and practical solution for resource-limited regions, and can be effectively applied in the field of food safety.
Development of portable, sensitive and reliable devices for Ochratoxin A (OTA) detection is highly demanded, especially for resource-limited regions. Herein, a novel paper-based analytical device (PAD) is designed through wax printing and screen-printed technologies, which integrates sample flowing, electrode modification, cleaning and electrochemical (EC)/colorimetric signal output. To greatly enhance the detection sensitivity, we synthesized a chitosan functionalized MoS2?Au@Pt (Ch-MoS2-Au@Pt) via electrostatic self-assembly, and used it to immobilize the label aptamer (apta2) for signal regulation and amplification. Concretely, with the addition of analytes, the Ch-MoS2-Au@Pt-apta2 could be combined on the sensing interface by specific biorecognition and catalyzed reduction of H2O2, resulting in a remarkable EC response. Meanwhile, the released hydroxyl radicals (?OH) flowed to the visualization zone and promoted the oxidation of 3,3?,5,5?-tetramethylbenzidine for colorimetric detection. Consequently, the dual-mode PAD achieved acceptable prediction and accurate analysis in the range of 0.1?200 ng mL-1 and 1 ? 10-4-200 ng mL-1 by matching the visual and EC signal intensity, respectively. Compared with traditional single-mode sensor for OTA, the proposed dual-mode aptasensor featuring independent signal conversion and readout, not only avoided the false-positive signal associated with detection condition and operation, but also enlarged the detection ranges and improved the sensitivity. Furthermore, the consistency of EC/colorimetric assay was validated in real OTA samples. Overall, this work provided a portable, cost-effective, sensitive and visualized aptasensor platform, which could be extended to various other mycotoxins in the field of food safety.
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