Enzyme-Fiber Composite Immobilization via Crosslinking
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Solution Overview
Problem
Conventional methods for immobilizing enzymes in three-dimensional network structured fibers face challenges of low yield and poor long-term stability, especially when fibers lack functional groups for covalent bonding, making it difficult to commercialize these composites for applications like biosensors and biofuel cells.
Innovation Solution
A method involving enzyme adsorption onto porous three-dimensional network fibers, followed by addition of a precipitant and a crosslinker to form enzyme aggregates that are crosslinked, allowing for stable immobilization without the need for covalent bonds between the enzyme and the fibers, thereby increasing the amount of enzyme loaded and maintaining stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional covalent bonding methods are used to immobilize enzymes on fibers, then enzyme stability is improved, but enzyme loading amount is limited and requires functional groups on fiber surface
Solution Approach 1:
The patent introduces a two-step immobilization process using an intermediary crosslinking step. First, enzymes are adsorbed onto the fiber surface, then a crosslinking agent is applied to form covalent bonds between adjacent enzyme molecules, creating a stable enzyme network without requiring functional groups on the fiber surface itself. This intermediary crosslinking mechanism resolves the contradiction by providing stability through enzyme-enzyme bonding rather than enzyme-fiber bonding.
Solution Approach 2:
The patent changes the bonding mechanism from direct covalent bonding between enzyme and fiber to adsorption followed by crosslinking. This parameter change in the immobilization chemistry allows significantly higher enzyme loading amounts while maintaining stability, as the crosslinked enzyme network can accommodate much higher enzyme concentrations without requiring surface functional groups.
2Quantity of substance
If simple adsorption method is used to immobilize enzymes, then enzyme loading amount is increased, but long-term stability is poor
Solution Approach 1:
The patent applies preliminary adsorption of enzymes onto the fiber surface before applying the crosslinking agent. This preliminary action allows maximum enzyme loading to occur first, and then the crosslinking step locks the enzymes in place, preventing leaching and denaturation. The sequence of operations resolves the contradiction by first maximizing loading amount through adsorption, then ensuring long-term stability through crosslinking.
3Reliability
If crosslinking agents are applied directly without adsorption, then enzyme stability is improved, but enzyme loading amount remains limited
Solution Approach 1:
The patent performs preliminary enzyme adsorption onto the fiber surface before applying the crosslinking agent. This preliminary action ensures that the fiber surface is saturated with enzymes at high concentration, and then the crosslinking step stabilizes this high-loading configuration. Without the preliminary adsorption step, direct crosslinking would be limited by the availability of surface functional groups, reducing productivity.
4Reliability
If covalent bonding is required for enzyme immobilization, then enzyme stability is improved, but applicability to fibers without functional groups is lost
Solution Approach 1:
The patent uses an intermediary crosslinking mechanism that creates covalent bonds between enzyme molecules rather than between enzyme and fiber. This intermediary approach allows the method to be applied to any fiber type regardless of surface functional groups, while still achieving stable enzyme immobilization through the crosslinked enzyme network. The versatility is dramatically improved as the method works on plain polymers without surface 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
This approach enables the stable immobilization of a significantly large amount of enzyme, preventing leaching and maintaining stability even after external impacts, leading to improved performance in devices such as biosensors and biofuel cells, and allows for use on fibers with few or no functional groups.
Implementation Method 1
adding a precipitant to the enzyme-adsorbed matrix, and adding a crosslinker to the resulting structures to form enzyme aggregates in which the precipitated enzyme molecules are crosslinked
Implementation Method 2
adding a crosslinker to the resulting structures to form enzyme aggregates in which the precipitated enzyme molecules are crosslinked
Implementation Method 3
adsorbing an enzyme onto a porous matrix including three-dimensional network fibers
Data Source
AI summary
Disclosed is a composite of enzyme and fiber matrix with three-dimensional structure. The composite of enzyme and fiber matrix with three-dimensional structure includes a significantly large amount of an enzyme loaded in and immobilized in/onto a matrix when compared to conventional composites. In addition, the immobilized enzyme is prevented from leaching from the matrix when an external impact is applied to the composite of enzyme and fiber matrix with three-dimensional structure. Therefore, the stability of the composite of enzyme and fiber matrix with three-dimensional structure of the present invention is maintained even after a long period passes since a remarkably great amount of enzymes compared with a known composite can be supported and immobilized to a matrix, and the immobilized enzyme is not easily released by an external impact. In addition, it is possible to stably immobilize a great amount of enzymes even if a functional group covalently bonding to enzymes is hardly present on the surface of fiber. Therefore, it is possible to remarkably improve performance by using the composite of enzyme and fiber matrix with three-dimensional structure of the present invention in a biosensor, a bio-fuel cell and the like, compared with the case using a known matrix composite.