Chinese Science Bulletin

, Volume 53, Issue 8, pp 1175–1184 | Cite as

The Escherichia coli O157:H7 DNA detection on a gold nanoparticle-enhanced piezoelectric biosensor

  • LiJiang Wang
  • QingShan Wei
  • ChunSheng Wu
  • ZhaoYing Hu
  • Jian Ji
  • Ping Wang
Articles Chemical Engineering


This paper presents development of a quartz crystal microbalance (QCM) biosensor for real-time detection of E. coli O157:H7 DNA based on nanogold particles amplification. Many inner Au nanoparticles were immobilized onto the thioled surface of the Au electrode, then more specific thiolated single-stranded DNA (ssDNA) probes could be fixed through Au-SH bonding. The hybridization was induced by exposing the ssDNA probe to the complementary target DNA of E. coli O157:H7 gene eaeA, then resulted in a mass change and corresponding frequency shifts (Δf) of the QCM. The outer avidin-coated Au nanoparticles could combine with the target DNA to increase the mass. The electrochemical techniques, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were adopted to manifest and character each step. The target DNA corresponding to 2.0×103 colony forming unit (CFU)/mL E. coli O157:H7 cells can be detected by this biosensor, so it is practical to develop a sensitive and effective QCM biosensor for pathogenic bacteria detection based on specific DNA analysis. The piezoelectric biosensing system has potential for further applications, such as food safety and environment monitoring, and this approach lays the groundwork for incorporating the method into an integrated system for in-field bacteria detection.

Key words

piezoelectric biosensor gold nanoparticle E. coli O157:H7 


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Copyright information

© Science in China Press 2008

Authors and Affiliations

  • LiJiang Wang
    • 1
  • QingShan Wei
    • 2
  • ChunSheng Wu
    • 1
  • ZhaoYing Hu
    • 1
  • Jian Ji
    • 2
  • Ping Wang
    • 1
  1. 1.Biosensor National Special Laboratory and Key Laboratory of Biomedical Engineering of Ministry of Education, Department of Biomedical EngineeringZhejiang UniversityHangzhouChina
  2. 2.Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of EducationZhejiang UniversityHangzhouChina

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