期刊
BIOSENSORS & BIOELECTRONICS
卷 210, 期 -, 页码 -出版社
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2022.114290
关键词
Functional nucleic acids; Gold nanoparticles; Hybrid film; Biosensing systems; Colorimetric detection
类别
资金
- National Natural Science Foundation of China [21874076]
- Natural Science Foundation of Tianjin City [18JCZDJC37800]
- Fundamental Research Funds for the Central Universities (China)
A portable, cost-effective and storable DNA-gold nanoparticle hybrid hydrogel film biosensing system was developed, which exhibited high sensitivity and fast response for Pb2+ and UO22+ detection. This system has great potential for future rapid on-site detection applications.
A portable, cost-effective and storable DNA-gold nanoparticle (AuNP) hybrid hydrogel film based biosensing system was developed, with AuNPs serving as both the crosslinking units of the film and the signaling units. Using a layer-by-layer assembly method, hydrogel film composed of three-dimensional hydrophilic network of densely packed AuNPs interconnected by responsive DNA structures was constructed onto a glass slide. By programming the sequence of DNA structures, target-responsive hybrid films were constructed. As a proof of concept, the sequence of a substrate DNA which can be identified and cleaved by Pb2+-dependent DNAzyme was encoded to construct Pb2+ -responsive DNA-AuNP hybrid hydrogel film. The high-density packing of AuNPs as signal substances significantly improved the sensitivity of the ultrathin film biosensing system while reduced the cost of expensive DNA materials. A hydrogel film composed of 10 layers of assembled DNA-AuNP structures generated sufficient visual colorimetric signals for Pb2+ detection, with a detection limit of 2.6 nM. By introducing UO22+-dependent DNAzyme, the system could be further applied in the sensitive and selective detection of UO22+, with a detection limit of 10.3 nM. Compared with bulk-sized DNA hydrogel biosensing systems, the DNA-AuNP hydrogel film biosensing system exhibited faster response thanks to the sub-micrometer ultrathin film structures. Moreover, the protection of fragile non-covalently crosslinked DNA films with solid slides also facilitated the portable application and long-term storage of the resulting biosensing system, with 95% of the response signal retained after three months of storage. The DNA-AuNPs hydrogel film biosensing system is highly promising for future rapid on-site detection applications.
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