Antimicrobial Citrate Polymers for Biomedical Applications
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Solution Overview
Problem
Biodegradable polymers used in biomedical applications often fail to effectively prevent microbial proliferation, leading to complications such as tissue destruction and infection, and existing solutions often require additional antimicrobial materials that can compromise the performance of these polymers.
Innovation Solution
Development of alkoxylated or alkenoxylated citrate-containing polymers or oligomers that provide antimicrobial properties without the need for additional antimicrobial materials, capable of reducing bacterial and fungal proliferation while maintaining the desirable properties of biodegradability and mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional antimicrobial materials are incorporated into biodegradable polymers to prevent microbial proliferation, then antimicrobial effectiveness is improved, but device complexity and performance degradation occur
Solution Approach 1:
The patent combines the structural backbone of biodegradable polymers with antimicrobial functional groups (quaternary ammonium, guanidinium, or amidinium) into a single integrated polymer structure. This merging eliminates the need for separate antimicrobial additives while providing both structural support and antimicrobial activity, thereby reducing composition complexity while maintaining effectiveness.
Solution Approach 2:
The invention creates composite polymer structures where biodegradable polymer chains are chemically bonded to antimicrobial cationic groups. This composite approach integrates two functional components (structural and antimicrobial) into a unified material system that provides both mechanical integrity and biological protection without requiring physical mixtures or coatings.
2Reliability
If additional antimicrobial materials are coated onto or encapsulated within biodegradable polymers, then antimicrobial properties are achieved, but mechanical properties and wet tissue adhesion are compromised
Solution Approach 1:
The antimicrobial groups are chemically integrated into the polymer backbone through covalent bonding rather than being applied as separate coatings or encapsulated materials. This merging ensures that the antimicrobial function becomes an intrinsic part of the polymer structure, maintaining mechanical integrity and adhesion properties while providing protection against microbial proliferation.
3Strength
If conventional biodegradable polymers are used without antimicrobial modification, then mechanical properties are maintained, but microbial proliferation occurs leading to tissue destruction and infection
Solution Approach 1:
The polymer structure is designed to provide its own antimicrobial protection through built-in cationic functional groups that naturally interact with and disrupt microbial membranes. This self-service capability eliminates the need for external antimicrobial agents while maintaining the polymer's mechanical properties and biodegradability, allowing the material to protect itself and surrounding tissues from microbial invasion.
Data Source
AI summary
In one aspect, compositions are described herein. In some embodiments, a composition described herein comprises the reaction product of (i) an alkoxylated or alkenoxylated citric acid, citrate, or ester of citric acid, and optionally a non-alkoxylated and non-alkenoxylated citric acid, citrate, or ester of citric acid, with (ii) a polyol. Additionally, in some cases, a composition described herein comprises the reaction product of (i) and (ii) above and (iii) one or more additional monomers. In some cases, the composition is cross-linked by the use of one or more oxidants such as sodium periodate (NaIO4) and/or silver nitrate (AgNO3), which can be reduced into a reduced oxidant that provides short-term antimicrobial activity. Such a composition can have both short-term and long-term antibiotic and antifungal activity.