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Analytical and Bioanalytical Chemistry

, Volume 409, Issue 14, pp 3657–3666 | Cite as

Digital triplex DNA assay based on plasmonic nanocrystals

  • Guohua Li
  • Liang Zhu
  • Yonghong He
  • Hui Tan
  • Shuqing Sun
Research Paper

Abstract

A new analytical method has been developed to detect three kinds of DNA simultaneously based on magnetic beads and color-encoded plasmonic nanocrystals. Magnetic beads modified with capture DNA are employed to collect the specific target DNA, and color-encoded plasmonic nanocrystals are applied to signal the target through DNA hybridization. As a proof of concept, three types of representative metal nanocrystals of gold nanoparticle (AuNP), gold nanorod (AuNR), and gold/silver nanoparticle (Au/AgNP) were employed to signal three dissimilar virus-related protective antigen genes, Ebola virus (EV), Variola virus (VV), and Bacillus anthracis (BA), respectively. Detection limits of 0.5–3 fM were obtained showing the high sensitivity for DNA detection. The microscopic discrimination of the encoded nanoparticles allows simple, rapid, accurate, and cost-effective detection of multiple DNA molecules, indicative of the potential in practical applications.

Graphical abstract

Development of a novel digital triplex DNA assay based on single-countable color-encoded plasmonic nanocrystals

Keywords

DNA assay Plasmonic nanocrystals Color coding Single particle detection 

Notes

Acknowledgements

This work was supported by the National Science Foundation of China (grants 21273126 and 21573124) and the Fundamental Research Program of Shenzhen (JCYJ20140509172959966, JCYJ20160317152359560). HT thanks the financial support from The Science Technology Innovation Commission of Shenzhen Municipality (GJHZ20160301163644983) and The Health and Family Planning Commission of Shenzhen Municipality (201601019).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Institute of Optical Imaging and Sensing, Shenzhen Key Laboratory for Minimal Invasive Medical Technologies, Graduate School at ShenzhenTsinghua UniversityShenzhenChina
  2. 2.Department of PhysicsTsinghua UniversityBeijingChina
  3. 3.Shenzhen Key Laboratory of NeurosurgeryThe First Affiliated Hospital of Shenzhen UniversityShenzhenChina

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