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A handheld real time thermal cycler for bacterial pathogen detection.

James A Higgins¹, Shanavaz Nasarabadi, Jeffrey S Karns

¹Animal Waste Pathogen Laboratory USDA-ARS, Room 202, Building 173, 10300 Baltimore Boulevard, Beltsville, MD 20705, USA. jhiggins@anri.barc.usda.gov

Biosensors & Bioelectronics

|June 6, 2003

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The handheld advanced nucleic acid analyzer (HANAA) offers portable real-time PCR for rapid field detection of bacterial targets like E. coli and B. anthracis. This compact device enables quick identification of pathogens, enhancing field-based biological analysis.

Area of Science:

Biotechnology
Molecular Biology
Analytical Chemistry

Background:

Real-time PCR (polymerase chain reaction) is a powerful technique for nucleic acid quantification.
Field-deployable analytical instruments are crucial for rapid on-site detection of biological targets.
Existing real-time PCR systems are often benchtop-bound, limiting their use in remote or field settings.

Purpose of the Study:

To evaluate the performance of the handheld advanced nucleic acid analyzer (HANAA) for real-time PCR applications.
To assess the device's capability for detecting specific bacterial strains and genes in various sample types.
To determine the assay times and potential limitations of the HANAA in a field-use context.

Main Methods:

The handheld advanced nucleic acid analyzer (HANAA), a portable real-time thermal cycler, was utilized.

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Polymerase chain reaction (PCR) assays were performed using SYBR Green dye and TaqMan probes.

The HANAA was tested for the detection of Escherichia coli, Bacillus anthracis, and Erwinia herbicola using specific gene targets.

Main Results:

The HANAA successfully detected E. coli strains (lacZ, Tir genes) in under 30 minutes, though with some background fluorescence.
Detection of Bacillus anthracis (vrrA, capA genes) was achieved in 32 and 22 minutes, respectively.
Rapid detection of Erwinia herbicola (aroQ gene) was observed in 7 minutes with negligible background fluorescence using a TaqMan probe.

Conclusions:

The handheld advanced nucleic acid analyzer (HANAA) provides a unique, portable solution for real-time PCR in field settings.
The device demonstrates effectiveness in the rapid detection of various bacterial pathogens.
Further development and commercial availability enhance its potential for field-based biological surveillance and diagnostics.