Shear thinning pectin hydrogels physically cross-linked with chitosan nanogels.

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Hydrogels are versatile materials with applications in drug delivery and tissue engineering.
• Developing self-healing and injectable hydrogels remains a significant challenge in materials science.

Purpose of the Study:

• To report the first development of a polymer-nanogel hydrogel using pectin and chitosan.
• To investigate the self-healing properties and injectability of this novel hydrogel system.

Main Methods:

• Fabrication of a hydrogel by combining soluble pectin chains with chitosan nanogels.
• Characterization of the hydrogel's self-healing behavior under shear stress.
• Analysis of the influence of nanogel concentration on rheological properties and swelling.

Main Results:

• The pectin-chitosan hydrogel demonstrated significant self-healing capabilities due to physical interactions.
• The material exhibited shear-thinning behavior and rapid recovery of its storage modulus upon removal of shear.
• Increased nanogel concentration led to higher viscosity and Young's modulus, with decreased equilibrium swelling.

Conclusions:

• The developed polymer-nanogel hydrogel possesses excellent network recovery, suitable for injectable biomedical applications.
• Chitosan nanogels effectively act as dynamic crosslinkers, imparting thermos-responsive and self-healing properties.
• This novel hydrogel system leverages nanogels as carriers, offering potential for advanced drug delivery platforms.