Crosslinker-Free Hyaluronic Acid Aerogels

Area of Science:

• Biomaterials science
• Polymer chemistry
• Materials science

Background:

• Hyaluronic acid (HA) is a crucial biopolymer with significant potential in biomedical applications.
• Developing novel HA-based materials requires innovative fabrication techniques.
• Previous research has not explored neat HA aerogels fabricated without chemical crosslinking.

Purpose of the Study:

• To prepare and characterize novel hyaluronic acid (HA) aerogels without chemical crosslinking.
• To investigate the influence of solution pH, HA concentration, and nonsolvent type on aerogel properties.
• To establish the foundational data for HA aerogels in advanced biomedical applications.

Main Methods:

• Aerogel preparation involved polymer dissolution, nonsolvent-induced phase separation, and supercritical CO2 drying.
• Systematic variation of solution pH, HA concentration, and nonsolvent type was employed.
• Characterization included assessment of network volume shrinkage, aerogel density, morphology, and specific surface area.

Main Results:

• Aerogel properties were highly dependent on the solution pH.
• The highest specific surface area (510 m²/g) and lowest density (0.057 g/cm³) were achieved at pH 2.5 (isoelectric point of HA).
• Morphology and network shrinkage were also significantly influenced by solution parameters.

Conclusions:

• This study presents the first report on neat hyaluronic acid aerogels prepared without chemical crosslinking.
• The findings demonstrate that HA aerogel properties can be precisely tuned by controlling solution pH.
• These novel HA aerogels show promise as advanced materials for diverse biomedical applications.