Biocompatible Co-polymers with Side-chain Amino Acids
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Solution Overview
Problem
Current synthetic polymers used in biomedical applications and contact lenses often exhibit tissue or bio-incompatibility due to their non-biological surfaces, and existing co-polymers with amino acids do not significantly enhance biocompatibility, especially lacking free alpha-amino-carbonic acid groups and being resistant to biological degradation.
Innovation Solution
Development of biocompatible co-polymers incorporating side chain-active acrylic amino acids with free alpha-amino-carbonic acid groups, which are miscible with acrylic building blocks and enhance hydrophilicity, oxygen permeability, and tissue compatibility by incorporating amino acids or their derivatives, and using protective groups to facilitate polymerization in solvent-free systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synthetic polymers are used in biomedical applications, then manufacturing ease and structural stability are maintained, but tissue compatibility and biocompatibility deteriorate due to non-biological surfaces
Solution Approach 1:
Protective groups (such as Boc, Fmoc, or Cbz) are introduced as intermediary entities that temporarily mask the reactivity of amino acid monomers, enabling their miscibility with acrylic building blocks during polymerization. After polymerization, these protective groups are removed to reveal free alpha-amino-carbonic acid groups that provide biocompatibility. This intermediary approach resolves the contradiction by allowing easy manufacture during polymerization while achieving tissue compatibility in the final product.
Solution Approach 2:
The chemical state of the amino acid monomers is changed from unprotected (highly reactive, immiscible) to protected (moderately reactive, miscible) during polymerization, and then back to unprotected (biocompatible) after polymerization. This parameter change in the protective state of the amino groups enables both ease of manufacture and tissue compatibility.
2Reliability
If amino acids are incorporated into polymers to improve biocompatibility, then tissue compatibility improves, but resistance to biological degradation deteriorates due to protease susceptibility
Solution Approach 1:
The natural peptidic bonds between amino acids are replaced with carbonic ester bonds formed through the polymerization of acrylic amino acid monomers. This substitution replaces the biological recognition system (protease- peptide bond) with a chemically stable system (carbonic ester bond) that is resistant to enzymatic degradation while maintaining the biocompatible properties of free amino groups after deprotection.
Solution Approach 2:
The polymer combines the biocompatible properties of free amino groups (after deprotection) with the hydrophobic and structural properties of acrylic polymer backbones. This composite structure provides both tissue compatibility and resistance to biological degradation, as the polymer is recognized as a synthetic material rather than a natural protein substrate.
3Reliability
If side chain-active acrylic amino acids are used without protective groups, then biocompatibility is achieved, but miscibility with acrylic building blocks deteriorates in solvent-free systems
Solution Approach 1:
Protective groups serve as intermediary entities that modify the physical and chemical properties of amino acid monomers, making them miscible with hydrophobic acrylic building blocks in solvent-free systems. The protective groups reduce the polarity and increase the organic solubility of the amino acid monomers, enabling homogeneous mixing and uniform polymerization. After polymerization, the protective groups are removed to restore the biocompatible free amino groups.
4Reliability
If conventional polymers are used for optical lenses, then optical properties and durability are maintained, but oxygen permeability and surface wetting deteriorate
Solution Approach 1:
The polymer incorporates amino acid side chains at specific local positions within the polymer matrix, creating local hydrophilic zones that enhance oxygen permeability and surface wetting while the bulk polymer maintains its optical properties and durability. The free alpha-amino-carbonic acid groups created after deprotection provide localized biocompatible surfaces that improve oxygen transport and reduce protein adsorption without compromising the overall polymer structure.
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 resulting co-polymers demonstrate improved biocompatibility, enhanced water uptake, and oxygen permeability, making them suitable for medical devices, cosmetics, and optical lenses with improved tissue compatibility and resistance to biological degradation.
Implementation Method 1
The co-polymers further include a free radical initiator
Implementation Method 2
the presence of amino acids or amino acid derivatives in the polymers of the invention increases their hydrophilicity. This property translates into enhanced uptake of water
Implementation Method 3
enhanced uptake of water, oxygen permeability
Data Source
AI summary
The invention relates to highly biocompatible or biophilic un-cross-linked or cross-linked polymers comprising one or more side-chain active acrylic amino acids of formula I. The invention further concerns various highly biocompatible, cross-linked co-polymers comprising one or more monomers of formula I, and one or more other polymerizable monomers. Uses of such polymers and co-polymers for the production of contact lenses, intraocular lenses, implants, wound healing slabs, additives for food and cosmetics, conductive plastics, spinnable fibers, and the like are disclosed.