Self-Assembling Peptide Gelation via pH and Ionic Strength Control
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Solution Overview
Problem
Existing self-assembling peptide technologies face challenges in achieving optimal mechanical properties and application-specific characteristics due to limitations in gelation kinetics, pH stability, and ionic strength, which affect their utility in various therapeutic and research contexts.
Innovation Solution
The development of peptide compositions with specific amino acid sequences, such as RADA16, IEIK13, and KLD12, that can self-assemble into gels with controlled rheological properties by adjusting pH and ionic strength, enhancing stiffness and gelation kinetics, and optimizing peptide concentration for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If peptide concentration is increased to enhance mechanical stiffness, then storage modulus is improved, but gelation time increases and application efficiency decreases
Solution Approach 1:
The patent applies parameter changes by systematically varying pH, ionic strength, and temperature to optimize gelation kinetics. Specifically, adjusting pH to near-neutral values and controlling ionic strength accelerates gelation rates while maintaining adequate mechanical stiffness, thereby resolving the trade-off between storage modulus and gelation time.
Solution Approach 2:
The patent employs dynamic control of gelation processes through time-dependent pH adjustment and staged ionic strength modification. This allows the system to transition from a soluble state during administration to a rapidly gelling state at the application site, achieving both fast gelation and sufficient mechanical properties without requiring high peptide concentrations.
2Productivity
If pH is adjusted to optimize gelation kinetics, then gelation rate is improved, but peptide stability and composition homogeneity deteriorate
Solution Approach 1:
The patent applies preliminary action by pre-adjusting pH and ionic strength conditions before peptide administration. The peptide is formulated in a stable, soluble state at controlled pH, then triggers rapid gelation upon contact with physiological fluids through pre-programmed pH sensitivity, thus achieving both fast gelation and maintained stability.
Solution Approach 2:
The patent uses pH-sensitive intermediates and buffer systems as mediators to control the gelation process. These intermediators allow the peptide to remain stable during storage and administration, then trigger controlled gelation at the target site through pH changes, resolving the contradiction between gelation rate and composition stability.
3Strength
If ionic strength is increased to enhance mechanical properties, then viscosity and stiffness are improved, but peptide solubility and self-assembly control deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling ionic strength within optimal ranges rather than simply increasing it. By adjusting ionic strength to specific values and using different salt types, the patent achieves adequate mechanical stiffness while maintaining peptide solubility and controlled self-assembly, avoiding the detrimental effects of excessive ionic strength.
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
These peptide compositions demonstrate improved mechanical properties and application-specific suitability, including enhanced stiffness, faster gelation, and increased cell viability, making them more effective for a broader range of biomedical applications.
Implementation Method 1
Peptide agents with the ability to self-assemble into gel structures
Implementation Method 2
amino acid sequence characterized by at least one stretch of alternating hydrophilic and hydrophobic amino acids
Implementation Method 3
gelation or self-assembly kinetics [e.g., rate of gelation and/or rate and reversibility of peptide self-assembly]
Implementation Method 4
establish the extent to which certain cations and anions interact with self-assembling peptide agents, and furthermore how such interactions can alter certain material (e.g., rheological) properties
Data Source
AI summary
The present disclosure provides peptide compositions (e.g., of self-assembling peptides) with particular attributes (e.g., peptide identity, peptide concentration, pH, ionic strength [including salt identity and/or concentration), etc. that show particularly useful material properties. The present disclosure also provides technologies for selecting and/or formulating particular peptide compositions useful in specific contexts. In some embodiments, provided peptide compositions have an elevated pH within the range of about 2.5 to about 3.5 and/or an ionic strength that is above that of a corresponding composition of the same peptide, at the same concentration, in water, but is below a critical salt point for the peptide (e.g., so that the composition is not cloudy).