Hydrolytically Degradable Zwitterionic Polymers for Anti-Fouling Drug Delivery
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Solution Overview
Problem
Current zwitterionic polymers lack structural diversity and biodegradability, limiting their use in drug delivery applications, and existing PEG alternatives face immunogenicity issues.
Innovation Solution
Synthesis of a zwitterionic polymer with a hydrolytically degradable polyphosphazene backbone and HEPES-based groups, providing excellent solubility and pH/temperature-dependent degradation, enhancing stealth behavior and compatibility with biological systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PEGylation is used to create hydrated steric barriers, then anti-fouling properties and protein-repulsive behavior are improved, but immunogenicity increases due to anti-PEG antibodies
Solution Approach 1:
The patent changes the chemical parameters of the polymer by replacing PEG with zwitterionic polymers containing both positive and negative charges, fundamentally altering the chemical composition to eliminate anti-PEG antibody formation while maintaining hydration layer properties for anti-fouling protection
Solution Approach 2:
The invention uses composite zwitterionic structures combining cationic and anionic groups within the same polymer chain, creating a dual-charged material that provides superior protein resistance compared to neutral PEG while avoiding immunogenicity
2Reliability
If existing zwitterionic polymers are used as PEG alternatives, then protein-repulsive properties are improved, but structural diversity and biodegradability remain insufficient
Solution Approach 1:
The patent segments the polymer structure into distinct functional domains: a biodegradable polyphosphazene backbone providing structural diversity and controlled degradation, and zwitterionic side chains providing protein-repulsive properties, allowing independent optimization of each function
Solution Approach 2:
The invention changes the backbone structure from non-degradable polymethacrylates to hydrolytically degradable polyphosphazenes, fundamentally altering the degradation parameter from negligible to controllable, while expanding structural diversity through varying side chain compositions
3Quantity of substance
If water-soluble zwitterionic polymers are used, then solubility and hydration are improved, but biodegradability is generally absent
Solution Approach 1:
The patent creates a composite polymer system combining the hydrophilic zwitterionic side chains (providing solubility and hydration) with the hydrolytically labile polyphosphazene backbone (providing biodegradability), where each component contributes its advantageous property to the overall material
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 polymer exhibits strong protein-repulsive properties, resistance to plasma protein interactions, and biocompatibility, making it suitable for life sciences applications.
Implementation Method 1
hydrolytically degradable polyphosphazene backbone
Implementation Method 2
formation of a strong hydration layer associated with amphoteric macromolecules
Data Source
AI summary
Provided are polymers with one or more domains. At least one domain of the polymer is zwitterionic. The zwitterionic domain may be a polyphosphazene having one or more HEPES-based groups. In various examples, the polymer is zwitterionic. The repeat unit in polyphosphazenes has the following general formula:where n is an integer. Each R may be the same or different. The pendant groups are also referred to herein as R and R′. At least one of the zwitterionic group may have the following structure:or a protonated or deprotonated form thereof. Also provided are methods of making and using the polymers of the present disclosure.