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Updated: Aug 6, 2026
Biosensor for Detection of Antibiotic Resistant Staphylococcus Bacteria
Published on: May 8, 2013
Pre-colored Prussian blue: A substrate-free dual-mode immunosensor for visible-to-thermal Staphylococcus aureus
Wenlan Min1, Zhengyi Cai2, Jinrui Lu3
1Department of Jiangxi Provincial Key Laboratory of Prevention and Treatment of Infectious Diseases, Jiangxi Medical Center for Critical Public Health Events, The First Affiliated Hospital, Jiangxi Medical College, Nanchang University, Nanchang, Jiangxi 330052, China.
A new dual-mode lateral flow immunoassay (LFIA) rapidly detects Staphylococcus aureus (S. aureus) infections using Prussian Blue nanoparticles. This simple, substrate-free test offers accurate results for timely diagnosis and improved patient care.
Area of Science:
- Nanotechnology
- Immunotechnology
- Biomedical Diagnostics
Background:
- Postoperative Staphylococcus aureus (S. aureus) infections require rapid identification for effective treatment.
- Current diagnostic methods can be time-consuming, delaying critical interventions.
- Developing faster, more reliable detection methods is crucial for patient outcomes.
Purpose of the Study:
- To develop a substrate-free, dual-mode lateral flow immunoassay (LFIA) for rapid S. aureus detection.
- To utilize intrinsically colored Prussian Blue nanoparticles (PB NPs) as multifunctional signal reporters.
- To enhance diagnostic reliability through a dual-readout strategy.
Main Methods:
- Fabrication of a substrate-free LFIA incorporating Prussian Blue nanoparticles (PB NPs).
- Utilized PB NPs for both colorimetric visualization and near-infrared photothermal conversion.
- Performed a one-step sandwich immunoreaction for simplified assay procedure.
- Validated the assay using real patient samples and compared with ELISA.
Main Results:
- Achieved a wide linear detection range of 10-10^6 CFU/mL for S. aureus.
- Demonstrated low detection limits: 10 CFU/mL (colorimetric) and 1 CFU/mL (photothermal).
- Real sample analysis showed good agreement with ELISA (deviations <10%) and high precision (CVs <15.5%).
Conclusions:
- The developed dual-mode LFIA provides a simple, rapid, and reliable method for S. aureus detection.
- The intrinsic color and photothermal properties of PB NPs eliminate the need for substrates and enzymes.
- The dual-readout enhances analytical reliability, showing strong potential for point-of-care testing applications.
