Sensitive detection of Escherichia coli O157:H7 using Pt-Au bimetal nanoparticles with peroxidase-like amplification

Details

• Personal Author:
  Du D ; Jiang T ; Li H ; Lin Y ; Song Y ; Wei T ; Zhu M-J
• Description:
  Escherichia coli O157:H7 is one of the most notorious foodborne pathogens causing serious disease at low infectious dose. To protect consumers from deadly foodborne E. coli O157:H7 infection, it is vital to develop a simple, reliable, sensitive and rapid method which can detect low level E. coli O157:H7 in foods at real-time. We have successfully developed a novel immunochromatographic assay (ICA) with enhanced sensitivity for the visual and quantitative detection of E. coli O157:H7. Sandwich-type immunoreactions were performed on the ICA, and Pt-Au bimetal nanoparticles (NPs) were accumulated on the test zone. The signal amplification is based on Pt-Au bimetal NPs possessing high peroxidase activity toward 3, 3',5, 5'-tetramethylbenzidine, which can produce characteristic colored bands and thus, enable visual detection of E. coli O157:H7 without instrumentation. The innovative aspect of this approach lies in the visualization and quantification of target pathogen through the detection of color intensity. Due to the excellent peroxidase activity of Pt-AuNPs, they emit strong visible color intensity in less than 1 min for visual observation even in low concentration range of E. coli O157:H7. Quantification was performed using a commercial assay meter. The sensitivity was improved more than 1000-folds compared to the conventional test strip based on colored gold-colloids. Although the feasibility was demonstrated using E. coli O157:H7 as a model analyte, this approach could be easily developed to be a universal signal amplification technique and applied to detection of a wide variety of food borne pathogens and protein biomarkers. [Description provided by NIOSH]
• Subjects:
  Communicable Diseases Occupational Health Safety
• Keywords:
  Author Keywords: Immunochromatographic Assay Diseases E. Coli O157:H7 Food Contaminants Infectious Diseases Nanoparticles Nanotechnology Pathogens Pathogens Detection Peroxidase Pt-Au Nanoparticles

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• ISSN:
  0956-5663
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  OSHA Region 10 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  77
• NIOSHTIC Number:
  nn:20048659
• Citation:
  Biosens Bioelectron 2016 Mar; 77:687-694
• Contact Point Address:
  Yuehe Lin, School of Mechanical and Material Engineering, Washington State University, Pullman, WA 99164
• Email:
  meijun.zhu@wsu.edu
• CAS Registry Number:
  3,3′,5,5′-Tetramethylbenzidine (CAS RN 54827-17-7)
• Federal Fiscal Year:
  2016
• NORA Priority Area:
  Agriculture, Forestry and Fishing
• Performing Organization:
  Washington State University
• Peer Reviewed:
  True
• Start Date:
  20150901
• Source Full Name:
  Biosensors and Bioelectronics
• End Date:
  20180831
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:22d3e5733499e3338901260eeb5cc5bd1c3f7352778ff25c163ab107065013dbb0d2e860db6027446272b1e7916dbe82c5fb183ff8016661e007edf385b6f1fd
• Download URL:
  https://stacks.cdc.gov/view/cdc/203367/cdc_203367_DS1.pdf
• File Type:
  [PDF - 4.99 MB ]