Journal
BIOMEDICAL MICRODEVICES
Volume 12, Issue 4, Pages 683-691Publisher
SPRINGER
DOI: 10.1007/s10544-010-9421-6
Keywords
Pathogens; E. coli O157:H7; Microfluidic chip; Microbeads; ATP-bioluminescence
Funding
- People's Liberation Army [06MB248]
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Detection of pathogens was demonstrated in a polydimethylsiloxane (PDMS)/glass microfluidic chip with which microbead-based immunoseparation platform and the bioluminescence technology were integrated. Escherichia coli (E. coli) O157:H7 was used as the model bacteria. The microchamber in microfluidic chip was filled with glass beads coated with antibodies which could capture specific organism, and the capture efficiency of the chip for the bacteria was about 91.75%similar to 95.62%. Then the concentration of bacteria was determined by detecting adenosine triphosphate (ATP) employing bioluminescence reaction of firefly luciferin-lucifera-ATP on chip. The method allowed reliable detection of E. coli O157:H7 concentrations from 3.2 x 10(1) cfu/mu L to 3.2 x 10(5) cfu/mu L within 20 min. This research demonstrated excellent reproducibility, stability, and specificity, and could accurately detect the pathogenic bacteria in food samples. The microfluidic chip and the equipments used in this method are easy to miniaturize, thus the method has great potential to be developed to a portable device for rapid detection of pathogens.
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