Chitin Extraction via Ionic Liquids and Enzymes
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Solution Overview
Problem
Current industrial processes for extracting chitin from marine crustacean shells are environmentally unfriendly and modify the chitin's properties, making it difficult to achieve consistent and desirable molecular weights and degrees of acetylation, which are crucial for specific applications.
Innovation Solution
A process involving the direct extraction of chitin from chitinous biomass using ionic liquids and co-solvents like DMSO, allowing for the formation of high molecular weight chitin films, fibers, and beads without the use of corrosive chemicals, and enabling the combination with natural or synthetic polymers for composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If chemical methods (acid demineralization, alkali deproteinization) are used to extract chitin from crustacean shells, then chitin can be isolated efficiently, but the chitin's molecular weight is reduced and its physiochemical properties are modified or degraded
Solution Approach 1:
The patent changes the extraction parameters by using enzymatic digestion instead of harsh chemical treatments. Specific enzymes (proteases, chitinases) are used under controlled conditions (pH 7-8, temperature 37-50°C) to selectively remove proteins and contaminants while preserving the chitin polymer structure and its molecular weight distribution.
Solution Approach 2:
The patent replaces the mechanical/chemical extraction system (acids and bases) with a biological system (enzymes). Enzymatic deproteinization and demineralization substitute for chemical methods, achieving similar extraction goals without the damaging effects on chitin's molecular structure.
2Ease of manufacture
If chemical methods are used for chitin extraction, then chitin can be obtained, but corrosive acids, bases, and strong oxidants are used which are not environmentally friendly
Solution Approach 1:
The patent converts the harmful chemical extraction process into a beneficial enzymatic process. Instead of using corrosive chemicals that harm the environment, naturally occurring enzymes are used to perform the same extraction function in an environmentally benign manner, turning a harmful process into a green technology solution.
Solution Approach 2:
The patent introduces enzymes as intermediary agents between the chitinous biomass and the final chitin product. These biological catalysts mediate the extraction process, enabling selective removal of contaminants without direct contact between the chitin and harsh chemicals, thus eliminating environmental harm.
3Ease of manufacture
If chitin is dissolved in traditional solvents, then processing can proceed, but chitin is highly hydrophobic and insoluble in water and most organic solvents due to high density of hydrogen bonds
Solution Approach 1:
The patent changes the solvent parameters by using ionic liquids instead of traditional organic solvents. These ionic liquids have unique properties (low viscosity, high stability, tunable solvation capacity) that enable them to disrupt chitin's hydrogen bonding network and dissolve the polymer effectively, overcoming chitin's inherent insolubility.
Solution Approach 2:
The patent uses ionic liquids as intermediary solvents that bridge the gap between chitin's hydrophobic nature and the need for dissolution. These ionic liquids act as mediators that can interact with both the hydrophobic chitin chains and provide sufficient solvation, enabling processing without requiring chitin to be inherently soluble in water or common organic solvents.
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 method preserves the original molecular weight of chitin, avoids environmental hazards, and allows for the production of chitin-based materials with consistent properties, suitable for various industrial applications, including biodegradable packaging and drug delivery.
Implementation Method 1
dissolving or dispersing a source of chitin in an ionic liquid, a co-solvent, or a mixture of an ionic liquid and a co-solvent
Implementation Method 2
adding a coagulant to the solution formed in step (a) and casting the chitin comprising solution into a film, a fiber, or a bead
Data Source
AI summary
Disclosed is a process for forming films, fibers, and beads comprising a chitinous mass, for example, chitin, chitosan obtained from one or more biomasses. The disclosed process can be used to prepare films, fibers, and beads comprising only polymers, i.e., chitin, obtained from a suitable biomass, or the films, fibers, and beads can comprise a mixture of polymers obtained from a suitable biomass and a naturally occurring and/or synthetic polymer. Disclosed herein are the films, fibers, and beads obtained from the disclosed process. This Abstract is presented solely to aid in searching the subject matter disclosed herein and is not intended to define, limit, or otherwise provide the full scope of the disclosed subject matter.