Self-decontaminating Coatings with Modified Antimicrobial Peptides
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Solution Overview
Problem
Current self-decontaminating surfaces incorporating antimicrobial peptides (AMPs) face challenges due to toxicity towards human cells, and there is a lack of investigation into AMPs as bulk additives in coating systems with post-cure screening for retention of antimicrobial activity.
Innovation Solution
Development of a self-decontaminating surface using AMPs derived from Chrysophrys major, specifically Chrysophsin-1 and -3, incorporated into a commercial acrylate coating system, where the carboxy-terminal Arg-Arg-Arg-His motif is removed to reduce toxicity and maintain antimicrobial activity, demonstrating effective bacterial reduction without significant surface exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antimicrobial peptides (AMPs) are incorporated into self-decontaminating surfaces, then antimicrobial activity is improved, but toxicity towards human cells increases
Solution Approach 1:
The patent modifies the amino acid sequence parameters of AMPs by removing the carboxy-terminal Arg-Arg-Arg-His motif and adjusting hydrophobicity to reduce toxicity while preserving antimicrobial activity. This parameter optimization allows the coating to maintain effectiveness against bacteria without harmful effects on human cells
Solution Approach 2:
The patent creates local concentration gradients of AMPs within the coating system, with higher concentrations at the surface for antimicrobial activity and controlled release into the bulk to minimize systemic toxicity. The amphipathic nature of AMPs enables surface segregation, concentrating activity where needed
2Reliability
If AMPs are used as bulk additives in coating systems, then antimicrobial protection is improved, but retention of activity after curing is uncertain
Solution Approach 1:
The patent incorporates AMPs into the coating formulation before application and curing, ensuring they are positioned within the coating matrix prior to polymerization. This preliminary incorporation prevents degradation or loss of activity during the curing process
Solution Approach 2:
The patent uses amphipathic AMPs as intermediaries that can interact with both the hydrophilic resin matrix and bacterial cell walls. This dual compatibility ensures stable incorporation into the coating while maintaining bioavailability and antimicrobial function after curing
3Reliability
If amphipathic AMPs are incorporated into hydrophilic resin coatings, then surface segregation and bioavailability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent exploits the self-segregating property of amphipathic AMPs in hydrophilic resin systems, where the peptides automatically orient themselves at the air-water interface during coating formation. This self-organization eliminates the need for complex processing steps to achieve surface concentration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating system achieves 99.9% reduction in Gram-positive and 90% reduction in Gram-negative bacteria within two hours, with reduced toxicity to eukaryotic cells, and shows a correlation between increased hydrophobicity and antimicrobial activity, indicating effective surface segregation and bioavailability of AMPs.
Implementation Method 1
Amphipathic molecules have been shown to surface segregate within such coatings, allowing for increased bioavailability of the anti-microbial component
Implementation Method 2
These properties allow for increased interaction with and insertion into negatively charged cell walls and membranes of microbes
Data Source
AI summary
Disclosed herein is a composition having: a polymeric material and an antimicrobial peptide derived from Chrysophrys major. Also disclosed herein is a method of: combining the polymeric material and antimicrobial peptide to form a coating material, and applying the coating material to a surface.