Porous Self-Healing Polymer Matrix for Gentle Protein Encapsulation
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Solution Overview
Problem
Existing encapsulation methods for macromolecules in biodegradable polymers expose active agents to harsh conditions, require high concentrations, and result in low encapsulation efficiency, especially for proteins and peptides, leading to significant losses and increased costs.
Innovation Solution
A porous self-healing polymer matrix with an ionic affinity trap, using metal ions and histidine tags, allows for encapsulation from aqueous solutions at low concentrations, achieving high loading and efficiency by immobilizing macromolecules within interconnected pores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If harsh processing conditions (organic solvents, excess heat, homogenization) are used for encapsulation, then the encapsulation process can be completed, but the proteins and macromolecules are denatured and destabilized
Solution Approach 1:
The patent changes the encapsulation parameters to aqueous environment, low temperature (below Tg of polymer), and controlled pH to prevent protein denaturation while achieving effective encapsulation through ionic affinity interactions between metal ions and histidine tags
Solution Approach 2:
The patent introduces metal ions as intermediaries that mediate the interaction between the polymer matrix and protein macromolecules through ionic affinity to histidine tags, enabling encapsulation without harsh conditions
2Quantity of substance
If high concentrations of hydrophilic macromolecules are used for encapsulation, then adequate loading can be achieved, but significant losses occur and encapsulation efficiency is low
Solution Approach 1:
The patent changes the concentration parameter by enabling effective encapsulation at low macromolecule concentrations through ionic affinity interactions, eliminating the need for high concentrations and associated losses
Solution Approach 2:
The patent replaces conventional diffusion-based encapsulation mechanisms with ionic affinity interactions between metal ions and histidine tags, achieving high encapsulation efficiency at low concentrations
3Ease of manufacture
If preformed microspheres with porous structure are used, then macromolecules can be loaded, but the pores must be closed through temperature rise above Tg which may destabilize proteins
Solution Approach 1:
The patent uses plasticizers to reduce the glass transition temperature to 37°C, enabling pore closure at physiological temperatures that preserve protein stability while achieving effective encapsulation
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 matrix provides high encapsulation efficiency and continuous release of active macromolecules, minimizing exposure to destabilizing factors and reducing waste, particularly beneficial for limited availability and high-cost macromolecules.
Implementation Method 1
The ionic affinity trap comprises a metal ion, and the active macromolecule is covalently bound to a histidine tag
Implementation Method 2
The release of encapsulated protein drugs from a PLGA matrix, therefore, requires the hydrophilic macromolecules to diffuse through water-filled pores or channels
Implementation Method 3
a continuous release of protein occurs due to polymer erosion that causes more pores and channels to be formed allowing protein to be released from previously isolated pores or chambers within the microsphere
Data Source
AI summary
The present disclosure relates to a porous self-healing polymer matrix for encapsulation of active macromolecules and a method of manufacturing said porous self-healing polymer matrix for a drug delivery system for a macromolecule.