Nano Express

Nanoscale Research Letters

, Volume 4, Issue 3, pp 216-220

Open Access This content is freely available online to anyone, anywhere at any time.

Effect of pH on the Interaction of Gold Nanoparticles with DNA and Application in the Detection of Human p53 Gene Mutation

  • Liping SunAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University Email author 
  • , Zhaowu ZhangAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University
  • , Shuang WangAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University
  • , Jianfeng ZhangAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University
  • , Hui LiAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University
  • , Lei RenAffiliated withDepartment of Biomaterials, College of Materials, Xiamen UniversityState Key Laboratory for Physical Chemistry of Solid Surfaces, Xiamen University
  • , Jian WengAffiliated withDepartment of Biomaterials, College of Materials, Xiamen University
  • , Qiqing ZhangAffiliated withDepartment of Biomaterials, College of Materials, Xiamen UniversityInstitute of Biomedical Engineering, Chinese Academy of Medical Science and Peking Union Medical College Email author 

Abstract

Gold nanoparticles (GNPs) are widely used to detect DNA. We studied the effect of pH on the assembly/disassembly of single-stranded DNA functionalized GNPs. Based on the different binding affinities of DNA to GNPs, we present a simple and fast way that uses HCl to drive the assembly of GNPs for detection of DNA sequences with single nucleotide differences. The assembly is reversible and can be switched by changing the solution pH. No covalent modification of DNA or GNP surface is needed. Oligonucleotide derived from human p53 gene with one-base substitution can be distinguished by a color change of the GNPs solution or a significant difference of the maximum absorption wavelength (λmax), compared with wildtype sequences. This method enables detection of 10 picomole quantities of target DNA.

Keywords

Single-stranded DNA HCl Gold nanoparticles p53 Mutation