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Antimicrobial Effectiveness

Antimicrobial Effectiveness

The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...

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Related Experiment Video

Updated: Oct 4, 2025

Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

Published on: June 29, 2021

Upper Critical Solution Temperature Polyvalent Scaffolds Aggregate and Exterminate Bacteria.

Kai-Feng Chen^1,2, Yiqing Zhang³, Jiawei Lin^1,2

¹School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China.

Small (Weinheim an Der Bergstrasse, Germany)

|February 7, 2022

Summary

This study introduces temperature-responsive polyvalent scaffolds that visualize and control bacterial aggregation. These scaffolds, decorated with aggregation-induced emission (AIE) molecules, enable targeted bacterial killing via photothermal therapy.

Keywords:

aggregation-induced emission bacteria aggregation polyvalent scaffolds targeted killing bacteria upper critical solution temperature

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Area of Science:

Biomaterials Science
Polymer Chemistry
Microbiology

Background:

Bacteria-host interactions are crucial for controlling bacterial aggregation and elimination.
Aggregation-induced emission (AIE) molecules offer unique optical properties for visualization.
Upper critical solution temperature (UCST) polymers exhibit tunable solubility with temperature changes.

Purpose of the Study:

To develop a temperature-stimulus-responsive polyvalent scaffold for visualizing bacterial aggregation.
To control bacteria-polyvalent scaffold affinities using temperature.
To achieve targeted bacterial killing through photothermal therapy.

Main Methods:

Synthesis of diblock polyvalent scaffolds (PATC-GlcN) via reversible addition-fragmentation chain transfer (RAFT) polymerization.
Utilizing UCST polymer (PATC) and glucosamine (GlcN) recognition block.
Employing aggregation-induced emission (AIE) for visualization and IR780 for photothermal killing.

Main Results:

Polyvalent scaffolds induced E. coli aggregation below UCST and dissociation above UCST.
Bacteria-scaffold interactions and aggregation were visualized using fluorescence imaging.
IR780-loaded scaffolds demonstrated targeted killing of E. coli in vitro and in vivo under NIR radiation.

Conclusions:

Temperature-responsive polyvalent scaffolds offer a novel strategy for visualizing and controlling bacterial aggregation.
The developed system enables targeted photothermal killing of bacteria.
This approach holds promise for developing new antimicrobial strategies.