Low Molecular Weight Silk Fibroin Stabilization
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Solution Overview
Problem
Current methods for stabilizing active agents and biological samples are limited by their sensitivity to environmental changes and poor recovery rates, making them unsuitable for long-term storage and on-demand applications.
Innovation Solution
Low molecular weight silk fibroin compositions with a specific molecular weight distribution, characterized by no more than 15% of fragments exceeding 200 kDa and at least 50% within the range of 3.5 kDa to 120 kDa, are used to stabilize active agents and biological samples, enhancing their solubility and recovery rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stabilization methods (cold-chain storage, lyophilization, covalent immobilization) are used, then active agents can be stabilized, but energy requirements increase and recovery rates decrease
Solution Approach 1:
The patent changes the molecular weight parameter of silk fibroin to create low molecular weight fragments (average 10-50 kDa), which fundamentally alters the stabilization mechanism. These smaller fragments provide stabilization without requiring cold-chain storage or lyophilization, thereby reducing energy requirements while maintaining reliability
Solution Approach 2:
The invention uses inexpensive, biodegradable low molecular weight silk fibroin fragments that can be easily disposed of after use, replacing expensive and energy-intensive conventional stabilization methods. The material provides sufficient stabilization for its intended purpose without requiring complex infrastructure
2Reliability
If conventional stabilization methods are used, then active agents can be stabilized, but recovery rates of active agents are poor
Solution Approach 1:
The silk fibroin is segmented into low molecular weight fragments (10-50 kDa average), which creates a material that provides stabilization while allowing easy recovery of active agents. The segmented structure prevents permanent binding or immobilization, enabling high recovery rates compared to covalent immobilization methods
Solution Approach 2:
Low molecular weight silk fibroin acts as an intermediary substance that temporarily protects active agents during storage and transport, then easily releases them when needed. This mediator approach enables both stabilization and high recovery rates, unlike direct covalent binding methods
3Reliability
If silk fibroin is used to stabilize active agents, then stability is improved, but solubility and recovery are limited with conventional molecular weights
Solution Approach 1:
Changing the molecular weight parameter of silk fibroin to low ranges (10-50 kDa) fundamentally improves solubility and ease of recovery. The smaller fragments dissolve more readily in aqueous solutions and can be easily separated from stabilized active agents, making the system much easier to operate
Solution Approach 2:
The invention creates a composite system combining low molecular weight silk fibroin fragments with active agents, where the unique properties of the silk fragments (size, solubility, biocompatibility) enhance both stability and ease of operation. This composite approach overcomes the limitations of using conventional molecular weight silk fibroin alone
Data Source
AI summary
The present disclosure provides certain silk-fibroin compositions with particular characteristics and/or properties. In some embodiments, the disclosure provides low molecular weight compositions. In some embodiments, the disclosure provides silk fibroin compositions that comprise an active (e.g., a biological) agent or component. In some embodiments, the disclosure provides low molecular weight silk fibroin compositions that comprise an active (e.g., a biological) agent or component. In some embodiments, an active agent is stabilized in a silk composition, e.g., for a period of time and/or against certain conditions or events. In some embodiments, a component present in a silk fibroin composition may be subject to analysis and/or characterization. In some embodiments, a component present in a silk fibroin composition may be recovered from the composition.