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Updated: Dec 31, 2025

Synthesis of Functionalized Magnetic Nanoparticles, Their Conjugation with the Siderophore Feroxamine and its Evaluation for Bacteria Detection

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Published on: June 16, 2020

A Convenient Colorimetric Bacteria Detection Method Utilizing Chitosan-Coated Magnetic Nanoparticles.

Thao Nguyen Le¹, Tai Duc Tran¹, Moon Il Kim¹

¹Department of BioNano Technology, Gachon University, 1342 Seongnamdae-ro, Sujeong-gu, Seongnam, Gyeonggi 13120, Korea.

Nanomaterials (Basel, Switzerland)

|January 8, 2020

Summary

A new colorimetric assay using chitosan-coated iron oxide magnetic nanoparticles (CS-MNPs) offers rapid bacterial detection. This method aids in early diagnosis of bacterial infections, improving patient outcomes.

Keywords:

Escherichia coli Staphylococcus aureus chitosan-coated magnetic nanoparticles colorimetric bacteria detection peroxidase-like activity

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Published on: September 17, 2017

Area of Science:

Nanotechnology
Biotechnology
Analytical Chemistry

Background:

Early bacterial infection diagnosis is crucial for effective treatment and improved human health.
Current diagnostic methods may lack speed, sensitivity, or accessibility in resource-limited settings.

Purpose of the Study:

To develop a simple, reliable, and economical colorimetric assay for bacterial detection.
To utilize the peroxidase-like activity of chitosan-coated iron oxide magnetic nanoparticles (CS-MNPs) for this purpose.

Main Methods:

CS-MNPs were synthesized and their peroxidase-like activity was investigated.
The interaction between CS-MNPs and bacterial cells (Escherichia coli, Staphylococcus aureus) was studied.
A colorimetric assay was developed based on the modulation of CS-MNP activity by bacteria.

Main Results:

CS-MNPs exhibit peroxidase-like activity that is significantly reduced upon interaction with bacterial cells.
The assay enabled naked-eye detection of bacteria down to 10^4 CFU mL^-1.
Spectrophotometric detection achieved sensitivity down to 10^2 CFU mL^-1 within 10 minutes.

Conclusions:

The developed CS-MNP-based colorimetric assay is a rapid and effective method for bacterial detection.
This assay holds significant potential for point-of-care testing (POCT) and on-site diagnosis of bacterial infections in facility-limited environments.