Crosslinked Alginic Acid Gel Structure Resistant to Chelating Agents
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Solution Overview
Problem
There is a need for a novel crosslinked alginic acid and derivatives that can form stable gels with improved material permeability and biocompatibility, as existing methods result in gels that are easily broken down by chelating agents.
Innovation Solution
The use of alginic acid derivatives with specific introduced crosslinking groups, such as those represented by formulas (I) and (II), to form crosslinked alginic acid structures through a Michael addition reaction, combining ionic and chemical crosslinks, resulting in stable beads or gels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If ionic crosslinking by divalent metal ions is used to form alginic acid gel, then gel formation is achieved, but the gel structure is easily broken down by chelating agents
Solution Approach 1:
The patent creates a composite crosslinked structure combining both ionic crosslinks (divalent metal ions) and covalent crosslinks (disulfide bonds) within the alginic acid gel network. This dual-crosslinking system provides synergistic stability where the covalent disulfide bonds anchor the structure while ionic crosslinks provide additional networking, making the gel resistant to chelating agents that would otherwise remove only the ionic crosslinks
Solution Approach 2:
The patent introduces cysteine residues as intermediary functional groups that form disulfide bridges between alginic acid chains. These disulfide bonds act as stable covalent intermediaries that maintain gel structure even when ionic crosslinks are disrupted by chelating agents, providing a dual-mechanism crosslinking system
2Stability of the object's composition
If chemical crosslinks are introduced to improve gel stability, then resistance to breakdown is improved, but material permeability may be reduced
Solution Approach 1:
The patent applies crosslinking locally at specific functional groups (carboxyl groups of alginic acid and amino/thiol groups of cysteine) rather than throughout the entire polymer chain. This localized crosslinking at discrete points creates a network structure that provides stability while leaving other regions of the gel matrix relatively open and permeable to solutes
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 crosslinked alginic acid structures exhibit enhanced stability and adjustable gel properties, with improved material permeability and biocompatibility, suitable for medical applications.
Implementation Method 1
The use of alginic acid derivatives with specific introduced crosslinking groups, such as those represented by formulas (I) and (II), to form crosslinked alginic acid structures through a Michael addition reaction
Implementation Method 2
an alginic acid gel (ionically crosslinked alginic acid) with a three-dimensional mesh structure formed by ionic crosslinking can be obtained by adding an aqueous solution containing a divalent metal ion
Data Source
AI summary
Provided are a novel crosslinked alginic acid, a crosslinked alginic acid structure, etc., by performing a crosslinking reaction using alginic acid derivatives represented by formula (I) and formula (II). As a result, a novel crosslinked alginic acid, crosslinked alginic acid structure, etc., are provided.