Microwave-accelerated metal-enhanced fluorescence: application to detection of genomic and exosporium anthrax DNA in <30 seconds

Analyst. 2007 Nov;132(11):1130-8. doi: 10.1039/b707876e. Epub 2007 Sep 11.

Abstract

We describe the ultra-fast and sensitive detection of the gene encoding the protective antigen of Bacillus anthracis the causative agent of anthrax. Our approach employs a highly novel platform technology, Microwave-Accelerated Metal-Enhanced Fluorescence (MAMEF), which combines the use of Metal-Enhanced Fluorescence to enhance assay sensitivity and focused microwave heating to spatially and kinetically accelerate DNA hybridization. Genomic and exosporium target DNA of Bacillus anthracis spores was detected within a minute in the nanograms per microliter concentration range using low-power focused microwave heating. The MAMEF technology was able to distinguish between B. anthracis and B. cereus, a non-virulent close relative. We believe that this study has set the stage and indeed provides an opportunity for the ultra-fast and specific detection of B. anthracis spores with minimal pre-processing steps using a relatively simple but cost-effective technology that could minimize casualties in the event of another anthrax attack.

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Antigens, Bacterial / genetics
  • Bacillus anthracis / genetics*
  • Bacillus cereus / genetics
  • Biosensing Techniques
  • DNA, Bacterial / analysis*
  • Fluorescent Dyes
  • Genome
  • Microwaves*
  • Nanostructures
  • Silver
  • Spectrometry, Fluorescence / methods*
  • Spores, Bacterial / genetics

Substances

  • Antigens, Bacterial
  • DNA, Bacterial
  • Fluorescent Dyes
  • Silver