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Updated: Jan 21, 2026
A Delayed Inoculation Model of Chronic Pseudomonas aeruginosa Wound Infection
Published on: February 20, 2020
Rapid and highly sensitive detection of pyocyanin biomarker in different Pseudomonas aeruginosa infections using gold
Amal A Elkhawaga1, Marwa M Khalifa2, Omnia El-Badawy1
1Department of Medical Microbiology and Immunology, Faculty of Medicine, Assiut University, Assiut, Egypt.
Abstract:
Successful antibiotic treatment of infections relies on accurate and rapid identification of the infectious agents. Pseudomonas aeruginosa is implicated in a wide range of human infections that mostly become complicated and life threating, especially in immunocompromised and critically ill patients. Conventional microbiological methods take more than three days to obtain accurate results. Pyocyanin is a distinctive electroactive biomarker for Pseudomonas aeruginosa. Here, we have prepared polyaniline/gold nanoparticles decorated ITO electrode and tested it to establish a rapid, diagnostic and highly sensitive pyocyanin sensor in a culture of Pseudomonas aeruginosa clinical isolates with high selectivity for traces of pyocyanin when measured in the existence of different interferences like vitamin C, uric acid, and glucose. The scanning electron microscopy and cyclic voltammetry techniques were used to characterize the morphology and electrical conductivity of the constructed electrode. The determined linear range for pyocyanin detection was from 238 μM to 1.9 μM with a detection limit of 500 nM. Compared to the screen-printed electrode used before, the constructed electrode showed a 4-fold enhanced performance. Furthermore, PANI/Au NPs/ITO modified electrodes have demonstrated the ability to detect pyocyanin directly in Pseudomonas aeruginosa culture without any potential interference with other species.
Insights
A new pyocyanin sensor using polyaniline/gold nanoparticles on an ITO electrode offers rapid and sensitive detection of Pseudomonas aeruginosa. This biosensor provides a faster alternative to traditional methods for identifying this dangerous pathogen.
Area of Science:
- Nanomaterials and Biosensors
- Clinical Microbiology
- Electrochemistry
Background:
- Accurate identification of infectious agents like Pseudomonas aeruginosa is crucial for effective antibiotic treatment.
- Conventional microbiological methods for Pseudomonas aeruginosa detection are time-consuming, often exceeding three days.
- Pyocyanin serves as a unique electroactive biomarker for Pseudomonas aeruginosa, enabling potential for rapid detection.
Purpose of the Study:
- To develop a rapid, highly sensitive, and selective pyocyanin sensor for detecting Pseudomonas aeruginosa.
- To utilize a polyaniline/gold nanoparticles decorated ITO electrode for enhanced sensor performance.
- To validate the sensor's efficacy in clinical isolates and in the presence of common interfering substances.
Main Methods:
- Fabrication of a polyaniline/gold nanoparticles decorated indium tin oxide (ITO) electrode.
- Characterization of the electrode's morphology and electrical conductivity using scanning electron microscopy and cyclic voltammetry.
- Testing the sensor's sensitivity, selectivity, and linear detection range for pyocyanin in various conditions.
Main Results:
- The developed sensor demonstrated a linear detection range for pyocyanin from 238 μM to 1.9 μM, with a low detection limit of 500 nM.
- The polyaniline/gold nanoparticles/ITO electrode exhibited a 4-fold performance enhancement compared to previous screen-printed electrodes.
- The sensor successfully detected pyocyanin directly in Pseudomonas aeruginosa cultures, showing high selectivity even with interfering substances like vitamin C, uric acid, and glucose.
Conclusions:
- The polyaniline/gold nanoparticles decorated ITO electrode is a promising platform for a rapid and sensitive pyocyanin biosensor.
- This novel sensor significantly improves upon existing methods for Pseudomonas aeruginosa detection, offering faster results.
- The sensor's ability to function directly in bacterial cultures and resist interference highlights its clinical diagnostic potential.
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