Lipid Peptide Hydrogel Self-Assembly Without Crosslinkers
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Solution Overview
Problem
Existing hydrogels face challenges such as cumbersome preparation, unreacted crosslinkers, limited functional group introduction, and safety concerns, particularly in forming gels over a wide pH range and achieving biocompatibility and biodegradability.
Innovation Solution
A novel lipid peptide with a specific structure that self-assembles to form a hydrogel without crosslinkers, stable across a wide pH range, and suitable for biocompatible and biodegradable applications, using a peptide and lipid moiety that can gel aqueous or alcohol solutions with a small amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crosslinkers are used to form synthetic polymer gels, then gel formation is achieved, but unreacted crosslinkers remain causing safety concerns and cumbersome preparation
Solution Approach 1:
The patent removes the crosslinker from the system entirely by using self-assembling peptide amphipathic molecules that form gels through non-covalent interactions. This extraction of the harmful crosslinking agent eliminates safety concerns while simplifying the preparation process, as no crosslinking reaction needs to be controlled or monitored.
Solution Approach 2:
The peptide amphipathic molecules automatically self-assemble into fibrous structures and form gels without requiring external crosslinkers or complex preparation procedures. The system serves itself by utilizing the inherent properties of the peptide molecules to create the gel network through self-organization.
2Adaptability or versatility
If copolymerization reaction is used to introduce functional molecules, then functional groups are introduced, but introduction rate is limited and precise molecule design is difficult
Solution Approach 1:
The patent segments the functional molecule into distinct modular components: a peptide portion with specific amino acid sequences and a lipid portion with defined chain lengths and saturations. This segmentation allows independent optimization of each component's function and enables precise control over the overall molecular design and assembly.
Solution Approach 2:
The patent systematically varies key parameters such as the number of amino acid residues, the type of amino acids used, the length of lipid chains, and the degree of saturation. By changing these parameters, different gel properties and functional characteristics can be achieved without complex synthesis procedures.
3Reliability
If non-covalent gel formation is attempted in aqueous solution, then biocompatibility is improved, but gel formation is difficult compared to organic solvents
Solution Approach 1:
The patent creates a composite molecular structure combining peptide segments with lipid segments. This composite architecture enables the molecule to interact favorably with water through the peptide portions while the lipid portions provide hydrophobic driving forces for self-assembly, thereby achieving easy gel formation in aqueous solutions with high biocompatibility.
Solution Approach 2:
The patent optimizes the balance between hydrophilic and hydrophobic characteristics by adjusting the peptide-to-lipid ratio, the specific amino acid composition, and the lipid chain properties. These parameter adjustments create the right conditions for spontaneous self-assembly in water, making gel formation as easy as mixing the molecule with aqueous solvent.
4Ease of manufacture
If amphipathic low molecular weight molecules are used as hydrogelators, then gel formation is achieved, but gel structure is unstable in neutral pH range
Solution Approach 1:
The patent modifies the molecular parameters of the hydrogelator by incorporating specific amino acid residues with particular side chains that provide pH-independent stabilization. The peptide sequence and lipid structure are designed to maintain stable non-covalent interactions across a wide pH range, ensuring gel structure stability in neutral conditions while retaining gel formation capability.
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 lipid peptide forms a stable hydrogel in a neutral pH range, reducing environmental and biological load, and can incorporate up to 50% alcohol, making it suitable for various applications including cell culture, medical, and cosmetic uses.
Implementation Method 1
a fiber formed by the self-assembly of the lipid peptide
Implementation Method 2
molecules associate spontaneously by an intermolecular non-covalent interaction or the like under an appropriate external condition to grow to a macro functional assembly
Implementation Method 3
a hydrogel composed of the lipid peptide or the fiber and an aqueous solution or an alcohol aqueous solution
Data Source
AI summary
There is provided a lipid peptide that is capable of forming a hydrogel with an extremely small amount thereof over a liquid property range from acidic to alkaline, and a hydrogel having high environmental suitability, biocompatibility and biodegradability. A lipid peptide represented by Formula (1):(where R1 represents an aliphatic group having 9 to 23 carbon atoms;R2, R3, R4 and R5 independently represent a hydrogen atom, an alkyl group having 1 to 7 carbon atom(s) which optionally has a branched chain having 1 to 3 carbon atom(s), a phenylmethyl group, a phenylethyl group or a —(CH2)n—X group, and at least one of R2, R3, R4 and R5 represents a —(CH2)n—X group;n represents the number of 1 to 4; X represents an amino group, a guanidine group, a —CONH2 group or a 5-membered ring, a 6-membered ring or a fused heterocyclic ring composed of a 5-membered ring and a 6-membered ring which optionally have 1 to 3 nitrogen atom(s); and in represents 1 or 2), and a hydrogel comprising the lipid peptide.