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Published on: February 21, 2019
Detection of Bacterial Rhamnolipid Toxin by Redox Liposome Single Impact Electrochemistry
Justine Luy1, Dorine Ameline1, Christine Thobie-Gautier1
1Université de Nantes, CNRS, CEISAM UMR 6230, 44000, Nantes, France.
Abstract:
The detection of Rhamnolipid virulence factor produced by Pseudomonas aeruginosa involved in nosocomial infections is reported by using the redox liposome single impact electrochemistry. Redox liposomes based on 1,2-dimyristoyl-sn-glycero-3-phosphocholine as a pure phospholipid and potassium ferrocyanide as an encapsulated redox content are designed for using the interaction of the target toxin with the lipid membrane as a sensing strategy. The electrochemical sensing principle is based on the weakening of the liposomes lipid membrane upon interaction with Rhamnolipid toxin which leads upon impact at an ultramicroelectrode to the breakdown of the liposomes and the release/electrolysis of its encapsulated redox probe. We present as a proof of concept the sensitive and fast sensing of a submicromolar concentration of Rhamnolipid which is detected after less than 30 minutes of incubation with the liposomes, by the appearing of current spikes in the chronoamperometry measurement.
Insights
This study introduces a novel electrochemical method using redox liposomes for rapid detection of Rhamnolipid, a Pseudomonas aeruginosa virulence factor. This advancement aids in identifying nosocomial infections quickly and efficiently.
Area of Science:
- Electrochemistry
- Biochemistry
- Microbiology
Background:
- Pseudomonas aeruginosa is a significant cause of nosocomial infections.
- Rhamnolipid is a key virulence factor produced by P. aeruginosa.
- Rapid detection of virulence factors is crucial for infection control.
Purpose of the Study:
- To develop a sensitive and fast electrochemical method for detecting Rhamnolipid.
- To utilize redox liposomes as a sensing platform for toxin detection.
- To demonstrate the feasibility of this method for identifying bacterial virulence factors.
Main Methods:
- Design of redox liposomes using 1,2-dimyristoyl-sn-glycero-3-phosphocholine and potassium ferrocyanide.
- Utilizing the interaction between Rhamnolipid and the liposome lipid membrane as a sensing strategy.
- Employing single impact electrochemistry with an ultramicroelectrode for detection.
Main Results:
- Sensitive detection of submicromolar concentrations of Rhamnolipid.
- Detection achieved in less than 30 minutes.
- Observed current spikes in chronoamperometry measurements indicating Rhamnolipid presence.
Conclusions:
- Redox liposome single impact electrochemistry offers a sensitive and rapid detection method for Rhamnolipid.
- This approach provides a proof of concept for detecting bacterial toxins involved in infections.
- The method has potential applications in clinical diagnostics and infection control.
