Modified Enzymes for Controlling Hydrogel Crosslinking Density
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Solution Overview
Problem
Enzyme crosslinking in hydrogel matrices can lead to excessive crosslinking, resulting in stiffer and less flexible gels, and the continued diffusion of enzymes can cause mechanical property changes and potential tissue damage, making it challenging to achieve consistent properties and prevent enzyme elution.
Innovation Solution
Modifying enzyme molecules by increasing their perceived volume through covalent or non-covalent attachment of molecules or altering their electrostatic charge to control crosslinking density and mobility within the matrix, thereby regulating the crosslinking reaction and reducing enzyme diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If enzyme crosslinking is used to form hydrogel matrices, then gelation is achieved and mechanical strength is improved, but excessive crosslinking occurs resulting in stiffer and less flexible gels
Solution Approach 1:
The patent employs a dual-enzyme system where one enzyme (e.g., transglutaminase) catalyzes crosslinking reactions while another enzyme (e.g., protease) simultaneously degrades excess crosslinks. This dynamic balance allows the hydrogel to achieve sufficient mechanical strength while maintaining flexibility and preventing excessive stiffening that would occur with single-enzyme crosslinking systems
2Manufacturing precision
If enzyme crosslinking is performed to achieve desired gel properties, then crosslinking density is improved, but enzyme diffusion continues causing mechanical property changes and potential tissue damage
Solution Approach 1:
The patent incorporates enzymes with opposing functions into the hydrogel formulation before implantation. The degradative enzyme is pre-positioned within the matrix to immediately counterbalance crosslinking activity, preventing enzyme diffusion and uncontrolled crosslinking that would cause mechanical property changes and tissue damage after implantation
Solution Approach 2:
The dual-enzyme system creates an intrinsic feedback mechanism where crosslinking increases matrix density which in turn limits further enzyme diffusion, while the degradative enzyme continuously monitors and adjusts crosslink density. This self-regulating system prevents runaway crosslinking and enzyme elution that would otherwise cause harmful effects
3Productivity
If chemical crosslinking is used to form hydrogels, then gelation speed is improved and mechanical strength is increased, but toxicity and carcinogenicity of crosslinkers occur
Solution Approach 1:
The patent replaces chemical crosslinking mechanisms with enzyme-catalyzed crosslinking. Instead of using toxic chemical crosslinkers that rapidly form gels, the system employs biological enzymes (transglutaminase, protease) to catalyze crosslinking reactions under physiological conditions, eliminating toxicity and carcinogenicity while maintaining controllable gelation speed through enzyme activity regulation
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
This approach prevents excessive crosslinking, maintains desired mechanical properties, and reduces enzyme elution, leading to more stable and consistent hydrogel matrices with improved tissue compatibility.
Implementation Method 1
Enzyme crosslinked matrices are formed in a variety of applications in the food, cosmetic, and medical industries
Implementation Method 2
the continued diffusion of enzymes can cause mechanical property changes and potential tissue damage
Data Source
AI summary
Improved matrix or hydrogel that is formed by enzymatic crosslinking of polymers wherein the crosslinking enzyme molecules have been modified for the purpose of improving the crosslinking density, mechanical properties, or other properties of the matrix, and/or to provide improved control over the rate and/or extent of crosslinking, wherein the enzyme molecules are modified to alter the perceived volume of the enzyme molecules in the crosslinked matrix being formed. Methods of production and of use are also provided.