Polybranched Polyamine Microcapsules for Enzyme Stability
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Solution Overview
Problem
Existing methods for encapsulating detergent enzymes in liquid detergents face challenges in achieving optimal protection during storage and reliable release in wash water, as the enzyme permeates through the shell due to its low molecular weight and the permeability of polymer films, leading to instability and inefficient release.
Innovation Solution
The use of microcapsules with a membrane produced by cross-linking polybranched polyamines, which provides enhanced storage stability and controlled release of enzymes upon dilution, separating enzymes from surfactants and protecting sensitive detergent components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coacervate shell is used to protect enzymes in liquid detergent concentrates, then enzyme protection during storage is improved, but enzyme release in wash water becomes insufficient
Solution Approach 1:
The invention changes the physical-chemical parameters of the shell material from conventional coacervate polymers to superabsorbent polymers (SAP) with specific properties: high water absorption capacity (≥10 times their dry weight), specific glass transition temperature ranges, and controlled porosity. This parameter change enables the shell to maintain structural integrity during storage while allowing rapid enzyme release when water is added, resolving the contradiction between protection and release.
Solution Approach 2:
The invention uses composite material structures where the shell is formed from SAP crosslinked with multifunctional crosslinking agents, creating a network structure that combines protective and release functionalities. The composite nature of SAP-crosslinked shells provides both the mechanical strength for protection and the water-responsive swelling for release, eliminating the need to choose between protection or release performance.
2Stability of the object's composition
If the coacervate shell is made thick or crosslinked to prevent enzyme permeation, then enzyme stability during storage is improved, but adequate release of the enzyme becomes difficult to achieve
Solution Approach 1:
The invention introduces dynamic responsiveness to the shell structure through SAP materials that change their physical state based on water content. During storage, the shell maintains a compact, protective state. Upon contact with wash water, the SAP rapidly absorbs water and swells, dynamically opening the shell structure to release enzymes. This dynamic behavior allows the same shell to provide both protection and release without contradiction.
Solution Approach 2:
The invention exploits phase transition phenomena of superabsorbent polymers, which undergo a sol-gel transition or swelling transition when exposed to water. The SAP shell transitions from a relatively compact phase during storage to a highly swollen, porous phase in wash water, enabling the shell to maintain enzyme stability in the first phase while facilitating complete release in the second phase.
3Ease of manufacture
If conventional polymer shells are used for enzyme encapsulation, then ease of manufacture is improved, but premature release or insufficient release occurs due to permeability issues
Solution Approach 1:
The invention introduces crosslinking agents as intermediary substances that mediate between the SAP particles to form the shell matrix. Common crosslinking agents like borax, calcium ions, or glutaraldehyde facilitate the formation of a stable yet water-responsive shell structure. This intermediary approach maintains manufacturing simplicity while achieving reliable controlled release through the crosslinked SAP network's water-responsive swelling behavior.
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 microcapsules effectively stabilize enzymes during storage, ensuring timely release in wash water and protecting sensitive components, improving the stability and performance of detergent enzymes in liquid detergents.
Implementation Method 1
the enzyme permeates through the shell due to its low molecular weight and the permeability of polymer films
Implementation Method 2
a membrane produced by cross-linking polybranched polyamines
Implementation Method 3
the enzyme can be controllably retained within the particles despite migration of other materials through the walls of the particles
Data Source
AI summary
The present invention provides a (liquid detergent) composition, comprising an enzyme containing microcapsule produced by crosslinking of a polybranched polyamine.