Crosslinked Alginic Acid Gels Without Copper Cytotoxicity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a demand for novel alginic acid derivatives and crosslinked alginic acid structures that can be safely used in biological applications without copper-derived cytotoxicity, and that offer improved stability and permeability for gel formation.
Innovation Solution
The development of alginic acid derivatives with introduced reactive groups, such as cyclic alkyne and azide groups, allows for crosslinking via a Huisgen reaction at room temperature without a copper catalyst, forming stable crosslinked alginic acid structures that can be chemically and ionically crosslinked, enhancing gel properties and permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Huisgen reaction is performed using a copper catalyst to crosslink alginic acid, then crosslinking efficiency is improved, but cytotoxicity increases due to copper contamination
Solution Approach 1:
The invention extracts and removes the harmful copper catalyst from the crosslinking system by using copper-free Huisgen reaction conditions, thereby eliminating cytotoxicity while maintaining crosslinking efficiency through alternative reaction pathways
Solution Approach 2:
The invention introduces an intermediary mechanism by using strain-promoted azide-alkyne cycloaddition where the cyclic alkyne's ring strain energy acts as an internal driving force, replacing the need for copper catalyst mediation and enabling bioorthogonal crosslinking
2Strength
If conventional crosslinking methods are used to improve gel strength, then mechanical strength is improved, but gel permeability deteriorates
Solution Approach 1:
The invention applies local quality by creating heterogeneous crosslinking density within the gel structure, where crosslinks are strategically formed at specific locations to provide mechanical strength while leaving other regions more open to maintain permeability for nutrient and waste transport
Solution Approach 2:
The invention utilizes porous material principles by forming a crosslinked gel network that maintains controlled porosity, allowing the gel to exhibit both mechanical strength through crosslinks and permeability through interconnected pores that facilitate mass transport
3Stability of the object's composition
If alginic acid is crosslinked to improve stability, then chemical stability is improved, but manufacturing complexity increases
Solution Approach 1:
The invention applies self-service by using inherently reactive functional groups (carboxyl groups of alginic acid, azide and alkyne groups of introduced compounds) that spontaneously undergo crosslinking reactions under mild conditions without requiring complex external catalysts or multi-step manufacturing processes
Solution Approach 2:
The invention utilizes parameter changes by adjusting pH and temperature to optimize the crosslinking reaction conditions, where slight changes in these parameters control the reaction rate and crosslinking extent, simplifying the manufacturing process while achieving stable crosslinked gels
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 novel crosslinked alginic acid structures provide enhanced stability and permeability, are safe for biological use, and can be molded into beads or gels with controlled substance retention, overcoming copper toxicity concerns and improving gel performance.
Implementation Method 1
a crosslinked alginic acid obtained by performing a Huisgen reaction (1,3-dipolar cycloaddition reaction) using an alginic acid derivative of formula (I) and an alginic acid derivative of formula (II)
Implementation Method 2
the novel crosslinked alginic acid structure is highly stable and suitable for gel formation with improved permeability
Data Source
AI summary
Provided are novel alginic acid derivatives and a novel crosslinked alginic acid. The alginic acid derivatives are represented by formula (I) and formula (II). The novel crosslinked alginic acid obtained by Huisgen reaction using an alginic acid derivative of formula (I) and an alginic acid derivative of formula (II).