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Filtration capture immunoassay for bacteria: optimization and potential for urinalysis
R S Mazenko1, F Rieders, J D Brewster
1Department of Pharmacology, The College of Graduate Studies, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Journal of Microbiological Methods
|June 24, 1999
Summary
This study presents a rapid, 25-minute assay for detecting Escherichia coli O157:H7 bacteria. The novel method combines immuno-labeling, filtration, and electrochemical detection for sensitive bacterial identification.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Microbiology
Background:
- Rapid and sensitive detection of pathogenic bacteria like Escherichia coli O157:H7 is crucial for public health.
- Existing methods for bacterial detection can be time-consuming and require complex laboratory setups.
Purpose of the Study:
- To develop and optimize a novel, rapid assay for the detection of Escherichia coli O157:H7.
- To evaluate the performance of the developed assay using electrochemical detection.
Main Methods:
- Immuno-labeling of bacteria with specific antibodies conjugated to alkaline phosphatase.
- Capture of labeled bacteria using a 0.2 micrometer pore size polycarbonate track-etched membrane filter.
- Electrochemical detection of the enzyme substrate product via square wave voltammetry.
Main Results:
- An optimized assay achieved a detection limit of 5 x 10(3) E. coli O157:H7 per ml within 25 minutes.
- The assay demonstrated high capture efficiency due to membrane filtration and sensitivity from electrochemical detection.
- Successful detection of E. coli O157:H7 spiked into filter-sterilized urine at clinically relevant concentrations.
Conclusions:
- The developed immuno-labeling, filtration, and electrochemical assay provides a rapid and sensitive method for detecting Escherichia coli O157:H7.
- This assay holds potential for quick identification of bacterial contamination in various sample types, including clinical specimens.
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