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A Membrane-Intercalating Conjugated Oligoelectrolyte with High-Efficiency Photodynamic Antimicrobial Activity
Bing Wang1, Ming Wang1, Alexander Mikhailovsky1
1Center for Polymers and Organic Solids, Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, 93106, USA.
Angewandte Chemie (International Ed. in English)
|April 4, 2017
Summary
A novel conjugated oligoelectrolyte (COE), PTTP, efficiently targets bacterial membranes and generates singlet oxygen. This optically mediated approach demonstrates potent antibacterial activity against E. coli with low light doses.
Area of Science:
- Organic chemistry
- Photochemistry
- Antimicrobial research
Background:
- Conjugated oligoelectrolytes (COEs) are explored for various applications.
- Modulating band gaps in COEs is key for tuning optical properties.
- Developing efficient antimicrobial agents remains a critical challenge.
Purpose of the Study:
- To design and synthesize a novel COE, PTTP, with red-shifted absorption.
- To investigate PTTP's photophysical properties and singlet oxygen generation.
- To evaluate PTTP's efficacy as an optically mediated antimicrobial agent.
Main Methods:
- Synthesis of PTTP by incorporating electron-rich and electron-poor subunits.
- Spectroscopic analysis to determine absorption and emission maxima.
- Singlet oxygen quantum yield determination (ΦΔ).
- Assessment of antibacterial activity against E. coli under low light irradiation.
Main Results:
- PTTP synthesized with absorption maxima at 507 nm and emission at 725 nm.
- Efficient in situ singlet oxygen generation with ΦΔ ≈20%.
- Rapid membrane intercalation and effective antibacterial action against E. coli at 0.6 J/cm2.
Conclusions:
- PTTP is a promising membrane-intercalating COE with tailored photophysical properties.
- PTTP efficiently generates singlet oxygen, enabling potent photodynamic antimicrobial activity.
- PTTP represents a highly effective optically mediated antimicrobial agent for Gram-negative bacteria.