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Related Experiment Video

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A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria

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pH-Sensitive Compounds for Selective Inhibition of Acid-Producing Bacteria.

Yin Yang¹, Vytas Reipa², Guo Liu³

¹Volpe Research Center , American Dental Association Foundation , Gaithersburg , Maryland 20899 , United States.

ACS Applied Materials & Interfaces

|February 14, 2018

Summary

This study introduces a novel pH-sensitive quaternary pyridinium salt (QPS) that selectively targets acid-producing bacteria. This compound

Keywords:

acid-producing bacteria erosion quaternary ammonium salt targeted treatment π-conjugated systems

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Area of Science:

Biomaterials
Antimicrobial agents
pH-responsive materials

Background:

Systemic antibiotics pose risks like resistance and side effects.
Developing localized antimicrobial strategies is crucial for infection control.
Stimuli-responsive compounds offer controlled, on-site therapeutic delivery.

Purpose of the Study:

To design, synthesize, and characterize a novel pH-sensitive quaternary pyridinium salt (QPS).
To investigate the QPS's pH-dependent antibacterial activity and mechanism of action.
To evaluate the QPS's potential for preventing infection and erosion by targeting acid-producing bacteria.

Main Methods:

Synthesis and characterization of QPS and its analogue.
Evaluation of pH-sensitive physicochemical properties using UV-vis spectroscopy, DLS, and NMR.
Assessment of antibacterial activity against multispecies bacterial communities at varying pH levels.
Mechanistic studies to elucidate the acid-base triggered assembly and action.

Main Results:

The novel QPS exhibits enhanced antibacterial activity at low pH (4-8).
The QPS selectively inhibits acid-producing bacteria, maintaining environmental pH above 5.5.
A switchable assembly mechanism triggered by acid-base interactions was identified.
Physicochemical properties were characterized in aqueous and organic solutions.

Conclusions:

The developed QPS offers a targeted approach to combat acid-producing bacteria and prevent infections.
The pH-sensitive nature of QPS allows for controlled antimicrobial activity and environmental pH modulation.
This QPS represents a promising strategy for localized infection and erosion prevention.