The DOI matches its Crossref record; 34 of the 34 references it cites were found in a registry or an index.
Enzyme-Free Colorimetric Detection of DNA by Using Gold Nanoparticles and Hybridization Chain Reaction Amplification
Abstract
A novel, high sensitive, and specific DNA assay based on gold nanoparticle (AuNP) colorimetric detection and hybridization chain reaction (HCR) amplification has been demonstrated in this article. Two hairpin auxiliary probes were designed with single-stranded DNA (ssDNA) sticky ends which stabilize AuNPs and effectively prevent them from salt-induced aggregation. The target DNA hybridized with the hairpin auxiliary probes and triggered the formation of extended double-stranded DNA (dsDNA) polymers through HCR. As a result, the formed dsDNA polymers provide less stabilization without ssDNA sticky ends, and AuNPs undergo aggregation when salt concentration is increased. Subsequently, a pale purple-to-blue color variation is observed in the colloid solution. The system is simple in design and convenient in operation. The novel strategy eliminates the need for enzymatic reactions, separation processes, chemical modifications, and sophisticated instrumentation. The detection and discrimination process can be seen with the naked eye. The detection limit of this method is lower than or at least comparable to previous AuNP-based methods. Importantly, the protocol offers high selectivity for the determination between perfectly matched target oligonucleotides and targets with single base-pair mismatches.
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Metadata
- Authors
- Liu, P., Yang, X., Sun, S., Wang, Q., Wang, K., Huang, J., Liu, J., & He, L.
- Venue
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-08-09
- Volume
- 85
- Issue
- 16
- Pages
- 7689-7695
- ISSN
- 0003-2700 (ISSN-L)
- 1520-6882
- OpenAlex
- W2027678511
- Cited by
- 302
- References
- 34
- FWCI
- 15.20
- Type
- journal article
- Language
- en
- Open access
- closed
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