Journal
BIOSENSORS & BIOELECTRONICS
Volume 147, Issue -, Pages -Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2019.111787
Keywords
2D material; MoS2; GMR; Exosome
Categories
Funding
- National Natural Science Foundation of China [61273065, 81901002]
- Shanghai Jiao Tong University [AgriX2015005]
- Support fund of Joint research center for advanced aerospace technology of Shanghai Academy of Spaceflight Technology-Shanghai Jiao Tong University [USCAST2015-2]
- Support fund of aerospace technology [15GFZ-JJ02-05]
- Shanghai Sailing Program [19YF1425800]
- Center for Advanced Electronic Materials and Devices in Shanghai Jiao Tong University
- Analytical and Testing Center in Shanghai Jiao Tong University
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Exosome released from cells plays an important role in intercellular communication and show great clinical potential in early cancer screening and prognosis. Herein, an ultrasensitive Giant Magnetoresistance (GMR) biosensor was developed for exosome detection, which was based on 2D MoS2-Fe3O4 nanostructures (MOFE) as magnetic responsive probes for signal amplification. The MOFE can be readily synthesized with simple phase transfer method. Compared to pure Fe3O4 magnetic nanoparticles (MNPs), the layered MoS2 function as a template for recruiting high loading density of MNPs as magnetic probes. After modified by aptamer, we discover that the 2D magnetic MOFE hybrid nanostructures enable both multidentate targeting and multi-magnetic particle-based signal amplification, increasing the magnetic sensor performance, especially in sensitivity and output signal. Moreover, the 2D magnetic nanocomposites afford high selectivity and excellent reproducibility with detection limit of 100 exosomes in GMR sensor. Results demonstrate that the magnetic strategy based on 2D structures introduced here provide a new dimension for exosome detection, which show great potential of engineering 2D magnetic nanobioprobes for GMR based liquid biopsy application.
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