Skin-Inspired All-Natural Biogel for Bioadhesive Interface

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Bio-interfaces

Background:

• Natural material-based hydrogels are promising for bio-interfaces due to sustainability and biocompatibility.
• Existing hydrogels often suffer from poor mechanical strength, water resistance, and ionic conductivity.
• Natural Moisturizing Factor (NMF) in skin plays a crucial role in maintaining skin hydration and integrity.

Purpose of the Study:

• To develop an all-natural ionic biogel with enhanced properties without chemical modification.
• To create a biocompatible interface for electrophysiological signal recording.
• To provide a general and scalable approach for designing functional natural hydrogels.

Main Methods:

• Fabrication of an all-natural ionic biogel by combining gelatin and sodium pyrrolidone carboxylic acid (an NMF compound).
• Characterization of the biogel's mechanical strength, ionic conductivity, water retention, and degradability.
• Evaluation of the biogel's temperature-controlled reversible fluid-gel transition properties for in situ gelation.
• Assessment of the biogel's performance as an interface for electrophysiological signal recording.

Main Results:

• The developed biogel exhibited significantly enhanced mechanical strength, ionic conductivity, and water retention compared to pure gelatin hydrogel.
• The biogel demonstrated resistance to dehydration and complete degradability.
• Temperature-controlled reversible fluid-gel transition enabled conformal contact and dynamic compliance with curved surfaces.
• The biogel served as an effective and biocompatible interface for high-quality, long-term electrophysiological signal recording.

Conclusions:

• A straightforward strategy for fabricating all-natural ionic biogels with superior properties was successfully demonstrated.
• The NMF-inspired biogel offers a promising solution to overcome limitations of traditional natural hydrogels.
• The developed biogel is suitable for advanced bio-interface applications, particularly in electrophysiology.