Multiamino Acid Polyester Amides with Pendant Functional Groups
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Solution Overview
Problem
Current biodegradable polyester amides (PEAs) lack functional groups, limiting their utility and versatility in biomedical applications, as they cannot be easily modified to incorporate drugs or biologically active agents and do not have the ability to form hydrogels.
Innovation Solution
Development of biodegradable PEAs with free pendant functional groups such as —NH2, —OH, and —COOH, achieved through the synthesis of multiamino acid monomers and specific reaction pathways, allowing for the introduction of functional groups and the formation of hydrogels via photo-gelation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional PEA synthesis methods are used, then the polymer structure is simple and easy to manufacture, but the polymer lacks functional groups and has limited utility
Solution Approach 1:
The patent introduces functional groups at specific locations (pendant positions) on the polymer chain rather than uniformly throughout. This allows functional groups to be placed where they can participate in chemical conjugations while maintaining the overall simplicity of the polymer backbone structure.
Solution Approach 2:
The patent creates composite polymer structures by combining amino acid-based segments with functional group-containing segments. This results in a material that exhibits both the biocompatibility of amino acid-based PEAs and the reactivity of functional groups, enabling dual functionality without complete structural redesign.
2Adaptability or versatility
If functional groups are introduced into PEA, then the polymer can conjugate with drugs and bioactive agents, but the synthesis process becomes more complex
Solution Approach 1:
The patent incorporates functional groups during the polymer synthesis stage rather than adding them in subsequent modification steps. By using monomers that already contain functional groups (such as amino acid derivatives with pendant functional groups), the functionalization is achieved as part of the polymerization process itself, avoiding separate complex modification steps.
3Adaptability or versatility
If saturated diacids or diols are used in PEA synthesis, then the polymer has good biocompatibility, but the polymer cannot form hydrogels
Solution Approach 1:
The patent modifies the chemical parameters of the monomers by introducing functional groups containing carbon-to-carbon double bonds into otherwise saturated amino acid structures. This allows the polymer to maintain the biocompatibility of saturated backbones while gaining the hydrogel-forming capability of unsaturated bonds through the functional groups.
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 incorporation of functional groups enhances the biodegradable PEAs' ability to conjugate with drugs and biologically active agents, tailoring their properties like hydrophilicity and degradation rate, and enables the formation of hydrogels, expanding their biomedical applications.
Implementation Method 1
Biodegradable PEA is typically synthesized with a solution polycondensation reaction of α-amino acids, aliphatic dicarboxylic acids (or dichloride of dicarboxylic acids) and diols
Implementation Method 2
The availability of these carbon-to-carbon double bonds in turn permits the fabrication of hydrogels by photo-gelation of PEA precursors
Data Source
AI summary
Biodegradable saturated and unsaturated polyester amides (PEA)s made from multiamino acid monomers and methods of making biodegradable saturated and unsaturated PEAs.