Binary Colloidal Crystal Layers as Platforms for Surface Patterning of Puroindoline-Based Antimicrobial Peptides.
Andrew Boden1, Mrinal Bhave1, Peng-Yuan Wang1
1Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of Technology , Hawthorn, 3122 VIC, Australia.
ACS Applied Materials & Interfaces
|December 29, 2017
Summary
This study demonstrates how patterned surfaces with immobilized antimicrobial peptides (AMPs) can kill bacteria. Even low densities of immobilized PuroA effectively reduced E. coli viability, showcasing a new approach for antibacterial coatings.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Microbiology
Background:
- Bacterial biofilms and antibiotic resistance necessitate novel antibacterial strategies.
- Antimicrobial peptides (AMPs) show potential for surface coatings to combat these issues.
- Surface patterning can enhance AMP efficacy and aid in studying bacterial attachment.
Purpose of the Study:
- To develop and evaluate a method for patterned immobilization of the AMP PuroA on binary colloidal crystal (BCC) layers.
- To compare covalent immobilization versus physical adsorption of PuroA.
- To assess the antibacterial efficacy of immobilized PuroA against *Escherichia coli* (E. coli).
Main Methods:
- Fabrication of BCC layers for surface patterning.
- Selective immobilization of PuroA onto carboxylated particles using EDC/NHS coupling chemistry.
- Characterization using X-ray photoelectron spectroscopy, ζ potentials, and MALDI-TOF MS.
- Assessment of antimicrobial activity via E. coli viability assays.
Main Results:
- Both covalent and physical immobilization methods resulted in significant E. coli viability reduction (70%).
- Low densities of immobilized PuroA (1.93 × 1013 molecules/cm2 covalent, 7.14 × 1012 molecules/cm2 physical) were effective.
- MALDI-TOF MS confirmed immobilization but highlighted variability in covalent grafting success.
Conclusions:
- BCC layers serve as a viable platform for patterned AMP immobilization.
- Surface-MALDI is crucial for verifying small-molecule grafting reactions.
- This approach offers a promising strategy for developing next-generation antibacterial surfaces.
Keywords:
antimicrobial peptidesbinary colloidal crystalsnanoparticlespuroindolinesurface modificationsurface patterningMore Related Videos
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