Abstract
Development of advanced functional materials from naturally abundant polymers such as cellulose are of significant importance. Of particular interest is embedding antibacterial functionality to cellulose materials to make permanent antibacterial materials and devices. In the present research, a “clickable” quaternary ammonium compound, N-(2-ethoxy-2-oxoethyl)-N,N-dimethylprop-2yn-1-aminium bromide (EdMPABr) was synthesized via a simple reaction with nearly stoichiometric yield and well characterized with 1D (1H, 13C) and 2D (COSY, HSQC) NMR and ATR-FTIR. EdMPABr can be covalently bonded to many molecules containing an azido group to form non-leaching antibacterial materials via the simple Cu(I)-catalyzed alkyne-azide [2 + 3] cycloaddition reaction. As an example, EdMPABr was attached to our previously reported 3-O-azidopropoxypoly(ethylene glycol)-2,6-di-O-thexyldimethylsilyl cellulose (3-N3PEG-2,6-TDMS cellulose, DS = 0.54 at C3 determined by 1H NMR). Significant antibacterial activity of the synthesized 3-O-quaternary ammonium-2,6-di-O-thexyldimethylsilyl cellulose (3-QA-2,6-TDMS cellulose, DS = 0.30 at C3 determined by using N content from elemental analysis) was confirmed by testing against the representative bacteria Escherichia coli. By linking the EdMPABr to the honeycomb film of 3-N3PEG-2,6-TDMS cellulose, the formed honeycomb film exhibited both antibacterial and antifouling properties. This research provides a simple and robust route towards the development of permanent antibacterial materials and biomedical devices.
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Acknowledgments
This work was financially supported by the SENTINEL bioactive paper network. Special thanks go to Mr. Kevin Hodgson, light microscopy technician at UBC bioimaging facility, for assistance in the confocal microscopy measurements, Mr. Derrick Horne, senior electron microscopy technician at UBC bioimaging facility, for assistance in the EDX elemental analysis, and Mr. Reza Korehei for assistance in the test of antibacterial activity.
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Xu, W.Z., Gao, G. & Kadla, J.F. Synthesis of antibacterial cellulose materials using a “clickable” quaternary ammonium compound. Cellulose 20, 1187–1199 (2013). https://doi.org/10.1007/s10570-013-9914-6
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DOI: https://doi.org/10.1007/s10570-013-9914-6