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A facile method for the detection of DNA by using gold nanoparticle probes coupled with dynamic light scattering

Yang Zhang, Wei-Wei Fei and Neng-Qin Jia*

Author Affiliations

The Education Ministry Key Laboratory of Resource Chemistry, Department of Chemistry, College of Life and Environmental Sciences, Shanghai Normal University, 100 Guilin Road, Shanghai, 200234, China

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Nanoscale Research Letters 2012, 7:564  doi:10.1186/1556-276X-7-564

Published: 10 October 2012

Abstract

In this paper, we present a simple and rapid method for deoxyribonucleic acid (DNA) detection using gold nanoparticle probes coupled with dynamic light scattering (DLS) analysis. The redox agent 1,4-dithio-DL-threitol cross-links the gold nanoparticles (AuNPs) to form clusters, while the monothiol DNA could terminate the formation and stabilize the assembled clusters by their negatively charge-based repulsions. By varying the concentration of DNA, the different sizes of DNA-AuNP clusters can be obtained. The sizes of the DNA-AuNP clusters were determined by DLS. A linear correlation was obtained between the sizes and the logarithm of DNA concentration from 2 nM to 5 μM with a detection limit of 1 nM (S/N = 3).

Keywords:
DNA detection; Gold nanoclusters; Dynamic light scattering