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Filtration Isolation of Nucleic Acids: A Simple and Rapid DNA Extraction Method
Published on: August 6, 2016
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A rapid ionic liquid-based DNA extraction method for molecular diagnostics of urinary tract infections
Johanna Kreuter1,2, Lena Piglmann1,2, Katarina Priselac1,2
1TU Wien, Institute of Chemical, Environmental and Bioscience Engineering, Research Unit Molecular Diagnostics (IFA-Tulln), Tulln, Austria.
Microbiology Spectrum
|February 27, 2026
Summary
A new ionic liquid-based DNA extraction method (IL-DEx) offers rapid, low-cost bacterial DNA recovery from urine for urinary tract infection diagnostics. This method simplifies molecular testing, improving speed and accessibility in various healthcare settings.
Area of Science:
- Molecular Diagnostics
- Microbiology
- Biotechnology
Background:
- Urinary tract infections (UTIs) are common, driving significant antibiotic use.
- Accurate and rapid UTI diagnosis is crucial for effective treatment and antimicrobial stewardship.
- Current molecular diagnostics for UTIs are hindered by slow, costly, or complex DNA extraction methods.
Purpose of the Study:
- To develop and evaluate a rapid, simple, and cost-effective DNA extraction method for bacterial DNA from urine samples.
- To assess the performance of the ionic liquid-based DNA extraction (IL-DEx) method compared to commercial kits.
- To establish IL-DEx as a viable tool for molecular diagnostics in diverse settings.
Main Methods:
- Developed an ionic liquid-based DNA extraction (IL-DEx) method using minimal equipment and no hazardous chemicals.
- Benchmarked IL-DEx against a commercial kit (QIAamp DNA Mini Kit) using reference strains, clinical isolates, and spiked urine.
- Evaluated DNA recovery yields, quantitative PCR (qPCR) detection limits, and performance with clinical patient samples via qPCR and 16S rRNA gene sequencing.
Main Results:
- IL-DEx achieved comparable DNA yields for Gram-negative bacteria and sufficient yields for Gram-positive bacteria compared to a commercial kit.
- Demonstrated linear DNA recovery across a wide range (10⁸-10² CFU/mL) with low detection limits (~10²-10³ CFU/mL for Gram-negatives, ~10³-10⁴ CFU/mL for Gram-positives).
- Clinical evaluation showed IL-DEx reliably enabled pathogen detection by qPCR and sequencing, performing comparably to other established methods.
Conclusions:
- IL-DEx is the first ionic liquid-based method validated for bacterial DNA extraction from clinical urine samples.
- The method provides a fast (<30 min), simple, and low-cost alternative for DNA extraction from urine.
- IL-DEx is suitable for integration into molecular diagnostic workflows for UTIs, enhancing diagnostic speed and accessibility.
