Microcapsule Membrane Crosslinking for Enzyme Stability
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Solution Overview
Problem
Existing microencapsulation techniques for enzymes in liquid detergent concentrates fail to achieve optimal protection and timely release, as the membranes are either too permeable or too impermeable, leading to instability and premature release issues.
Innovation Solution
The use of microcapsules with a membrane formed by cross-linking polybranched polyamines and small aliphatic or aromatic amines, which provides a semipermeable barrier that stabilizes enzymes during storage and allows controlled release upon dilution in water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coacervation is used to form the shell, then protection of the enzyme from the continuous phase is improved, but the shell becomes either too impermeable or too permeable, leading to poor release performance or premature release
Solution Approach 1:
The invention uses a composite membrane structure formed by interfacial polymerization between water-soluble polymers (containing amine or amide groups) and oil-soluble polymers (containing carboxyl or acid groups). This composite approach combines the protective qualities of coacervation with the controlled permeability of IFC, creating a shell that provides both enzyme protection and reliable release performance.
Solution Approach 2:
The invention controls the permeability and release characteristics by adjusting parameters such as polymer molecular weight, polymer concentration, pH, and the ratio of water-soluble to oil-soluble polymer. By changing these parameters, the shell's permeability can be precisely tuned to achieve both protection and controlled release without premature release.
2Stability of the object's composition
If the shell is made impermeable to protect the enzyme, then enzyme stability is improved, but release when required becomes ineffective
Solution Approach 1:
The membrane is designed to be dynamic rather than static - its permeability changes in response to environmental conditions such as pH changes, temperature, or mechanical stress during the wash cycle. The interfacial polymerization creates a shell that maintains integrity for protection but can open or become permeable under specific trigger conditions, enabling both stability and efficient release.
Solution Approach 2:
The invention exploits phase transition phenomena where the membrane structure undergoes changes in response to environmental conditions. The crosslinked polymer network can transition between different states of permeability, remaining intact during storage but undergoing structural changes during use that enable enzyme release while maintaining both stability and productivity.
3Productivity
If the shell is made permeable to allow release, then release performance is improved, but premature release and enzyme instability occur
Solution Approach 1:
The interfacial polymerization process creates an intermediary shell structure that mediates between the enzyme core and the external environment. This intermediate layer provides a controlled interface that allows necessary exchange for release performance while maintaining sufficient barrier properties to prevent premature release and maintain enzyme stability during storage.
4Manufacturing precision
If interfacial condensation polymerization is used, then controlled encapsulation is achieved, but the membrane is either too permeable or too impermeable, preventing reliable enzyme release
Solution Approach 1:
The invention optimizes IFC by systematically adjusting parameters including polymer molecular weight (1,000-1,000,000 Da), polymer concentration (0.1-50% w/v), pH (3-10), and the ratio of water-soluble to oil-soluble polymer (1:4 to 4:1). These parameter changes enable precise control over membrane permeability to achieve both encapsulation quality and reliable release.
Solution Approach 2:
The use of composite polymer systems with complementary properties - water-soluble polymers providing structural integrity and oil-soluble polymers providing controlled permeability - resolves the contradiction between encapsulation precision and release reliability. The crosslinked network formed by these composite materials creates a membrane with balanced properties.
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 enhances the storage stability of enzymes and ensures timely release, protecting them from incompatible detergent components while maintaining detergent effectiveness.
Implementation Method 1
a membrane which is produced by cross-linking of (a) a polybranched polyamine having a molecular weight of more than 800 Da, and (b) an aliphatic or aromatic amine having a molecular weight of less than 300 Da; wherein the weight ratio of (a)/(b) is in the range of 0.1 to 1000
Implementation Method 2
a membrane which is produced by cross-linking of (a) a polybranched polyamine having a molecular weight of more than 800 Da, and (b) an aliphatic or aromatic amine having a molecular weight of less than 300 Da
Data Source
AI summary
The present invention provides a microcapsule composition produced by crosslinking of a polybranched polyamine and a small amine, which is used for stabilizing detergent components.