Multi-responsive supramolecular hydrogels based on merocyanine-peptide conjugates

Area of Science:

• Materials Science
• Supramolecular Chemistry
• Biomaterials Engineering

Background:

• Stimuli-responsive hydrogels are advanced "smart" materials with broad technological applications.
• Developing novel hydrogels with tunable properties is crucial for expanding their use.
• Peptide self-assembly offers a versatile platform for creating complex material architectures.

Purpose of the Study:

• To synthesize and characterize novel stimuli-responsive hydrogels based on peptide conjugates incorporating merocyanine (MC).
• To investigate the self-assembly behavior and stimuli-responsive properties of these MC-peptide conjugates.
• To explore the potential of these hydrogels in applications such as photo-lithography.

Main Methods:

• Synthesis of short peptide conjugates with merocyanine (MC).
• Characterization of hydrogel formation and self-assembly using various techniques.
• Evaluation of stimuli-responsive behavior (light, heat, pH, ions) and sol-gel transitions.
• Demonstration of photo-lithography using a multi-stimuli-responsive MCI-RGD hydrogel.

Main Results:

• Merocyanine effectively promotes the self-assembly of oligopeptide conjugates into hydrogels.
• The formed hydrogels exhibit responsiveness to light and heat, with tunable sol-gel transitions via spiropyran photochromism.
• A specific MCI-RGD conjugate forms a supramolecular hydrogel responsive to visible light, pH, and Ca(2+) ions.
• Erasable photo-lithography was successfully demonstrated on the MCI-RGD hydrogel using visible light and thermal cycling.

Conclusions:

• Merocyanine-peptide conjugates are effective in forming stimuli-responsive hydrogels.
• These novel hydrogels offer tunable responses to multiple stimuli, including light, heat, and chemical factors.
• The MCI-RGD hydrogel demonstrates potential for advanced applications like rewritable photo-patterning.