Dopa Peptide Hydrogel Wet Adhesion via Catechol-Lysine Interaction
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Solution Overview
Problem
Current wet adhesion materials, such as cyanoacrylate and fibrin-based glues, are toxic, have poor mechanical properties, and are limited in availability and biocompatibility, while existing hydrogels face challenges in achieving efficient underwater adhesion due to high dielectric and ionic strength of physiological fluids.
Innovation Solution
Development of ultrashort peptide sequences with a general formula AnBmAp, where A includes polar amino acids like levodopa and B includes hydrophobic amino acids, forming hydrogels that can self-assemble into nanofibrous structures with enhanced adhesive properties through the incorporation of catechol moieties and lysine, facilitating better wet adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cyanoacrylate based glues are used, then adhesion strength is improved, but toxicity increases and mechanical properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating Dopa-containing peptides with specific sequences (AnBmAp formula) that enable wet adhesion through catechol-lysine interactions, replacing toxic cyanoacrylate chemistry with biocompatible peptide-based adhesion mechanisms
Solution Approach 2:
The invention creates composite adhesive materials combining Dopa-containing peptides with hydrophobic and polar amino acid residues, forming nanofibrous hydrogel structures that provide both adhesion strength and biocompatibility, avoiding the toxicity of conventional single-component glues
2Object-affected harmful factors
If fibrin based glues are used, then biocompatibility is improved, but availability is limited and volume is reduced
Solution Approach 1:
The patent employs self-assembling peptide sequences that spontaneously form nanofibrous hydrogel structures in aqueous solutions without requiring external additives or complex formulation processes, enabling unlimited scalability of biocompatible adhesive material
Solution Approach 2:
The invention modifies the peptide sequence parameters according to the AnBmAp formula with varying numbers of hydrophobic (B) and polar (A) residues, allowing tuning of hydrogel properties while maintaining biocompatibility and enabling large-volume production
3Object-affected harmful factors
If hydrogels are used for underwater adhesion, then biocompatibility is improved, but adhesion efficiency deteriorates due to high dielectric and ionic strength of physiological fluids
Solution Approach 1:
The patent uses Dopa-containing peptide sequences as intermediary molecules that mediate adhesion in wet conditions through catechol-lysine interactions, where the peptide structure itself acts as the adhesive mechanism that overcomes the shielding effect of ionic species in physiological fluids
Solution Approach 2:
The invention creates composite peptide sequences combining hydrophobic residues (B) that provide structural stability with polar Dopa-containing residues (A) that provide wet adhesion capability, forming nanofibrous hydrogels that maintain adhesion efficiency in high-dielectric environments
4Strength
If ultrashort self-assembling peptides are used, then mechanical properties are improved, but adhesion in wet conditions deteriorates
Solution Approach 1:
The patent creates composite ultrashort peptide sequences (4-12 amino acids) combining hydrophobic residues (B) for mechanical stability with polar Dopa-containing residues (A) for wet adhesion, where the specific AnBmAp structure enables both nanofiber formation and catechol-lysine mediated adhesion in wet conditions
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 peptide-based hydrogels demonstrate improved biocompatibility, mechanical stability, and enhanced adhesive properties in wet conditions, suitable for medical and marine engineering applications, with IIZKDo peptide showing superior adhesion and biocompatibility for coral reef restoration.
Implementation Method 1
ultrashort self-assembling peptides (SAPs) are an intriguing alternative to collagen-mimicking matrices
Implementation Method 2
The peptide-based hydrogels demonstrate improved biocompatibility, mechanical stability
Implementation Method 3
B includes hydrophobic amino acids, forming hydrogels that can self-assemble into nanofibrous structures
Implementation Method 4
The wet adhesion of the catechol group to a variety of substrates in the presence of ionic species is well-documented
Implementation Method 5
the ability of the catechol moieties to interact with other amino acids and even metals in the form of both metal ions and oxides
Implementation Method 6
One of the Mfps' unique features is the high percentage of the L-Dopa content positioned in the vicinity of a lysine amino acid (Lys), in their protein sequence. Both L-Dopa and Lys are crucial for Mfps adhesion
Implementation Method 7
It was demonstrated that underwater adhesion is due to a synergy between a certain amount of both catechol and guanidinium side chains
Data Source
AI summary
The present disclosure relates to Dopa containing ultrashort peptides capable of forming a gel, to a gel comprising a peptide in accordance with the present disclosure, and to a glue comprising a peptide in accordance with the present disclosure. Such gel is adhesive and is biocompatible. The peptides are suitable for building 3D structures, 3D printing, gluing as well as other applications.