Related Experiment Video
Updated: May 8, 2026
A Protocol to Characterize the Morphological Changes of Clostridium difficile in Response to Antibiotic Treatment
Published on: May 25, 2017
Rapid, Point-of-Care Microwave Lysis and Electrochemical Detection of Clostridioides difficile Directly from Stool
Lovleen Tina Joshi1, Emmanuel Brousseau2, Trefor Morris3
1Faculty of Health, University of Plymouth, Plymouth PL4 8AA, UK.
Abstract:
The rapid detection of the spore form of Clostridioides difficile has remained a challenge for clinicians. To address this, we have developed a novel, precise, microwave-enhanced approach for near-spontaneous release of DNA from C. difficile spores via a bespoke microwave lysis platform. C. difficile spores were microwave-irradiated for 5 s in a pulsed microwave electric field at 2.45 GHz to lyse the spore and bacteria in each sample, which was then added to a screen-printed electrode and electrochemical DNA biosensor assay system to identify presence of the pathogen's two toxin genes. The microwave lysis method released both single-stranded and double-stranded genome DNA from the bacterium at quantifiable concentrations between 0.02 μg/mL to 250 μg/mL allowing for subsequent downstream detection in the biosensor. The electrochemical bench-top system comprises of oligonucleotide probes specific to conserved regions within tcdA and tcdB toxin genes of C. difficile and was able to detect 800 spores of C. difficile within 300 µL of unprocessed human stool samples in under 10 min. These results demonstrate the feasibility of using a solid-state power generated, pulsed microwave electric field to lyse and release DNA from human stool infected with C. difficile spores. This rapid microwave lysis method enhanced the rapidity of subsequent electrochemical detection in the development of a rapid point-of-care biosensor platform for C. difficile.
Insights
A new microwave lysis technique rapidly releases DNA from Clostridioides difficile spores. This breakthrough enables faster detection of C. difficile using an electrochemical biosensor, improving diagnostic speed.
Area of Science:
- Biotechnology
- Microbiology
- Analytical Chemistry
Background:
- Rapid detection of Clostridioides difficile spores is clinically significant but challenging.
- Current methods for C. difficile spore lysis and DNA release can be time-consuming.
Purpose of the Study:
- To develop a novel, rapid microwave-enhanced method for DNA release from C. difficile spores.
- To integrate this lysis method with an electrochemical biosensor for quick pathogen identification.
Main Methods:
- Utilized a bespoke microwave lysis platform to irradiate C. difficile spores with a pulsed microwave electric field (2.45 GHz) for 5 seconds.
- Developed an electrochemical DNA biosensor assay using oligonucleotide probes specific to C. difficile toxin genes (tcdA and tcdB).
- Analyzed DNA release concentrations and biosensor detection limits using unprocessed human stool samples.
Main Results:
- Microwave lysis effectively released both single-stranded and double-stranded DNA from C. difficile spores at concentrations from 0.02 μg/mL to 250 μg/mL.
- The integrated system detected 800 spores of C. difficile in 300 µL of stool within 10 minutes.
- Demonstrated feasibility of pulsed microwave electric fields for rapid DNA extraction from C. difficile spores in clinical samples.
Conclusions:
- The rapid microwave lysis method significantly enhances the speed of DNA release for downstream detection.
- This approach facilitates the development of a rapid point-of-care biosensor platform for C. difficile detection.
- The technology shows promise for faster clinical diagnostics of C. difficile infections.
