Hybrid Pectin-Fibroin Microgels with Supramolecular and Covalent Cross-Links

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Polysaccharides and proteins form hydrogels via ionic interactions and conformational changes.
• Research on bulk gel systems is extensive, but microscale properties require further investigation.
• Developing microgel systems from abundant, sustainable sources is crucial for advanced biomaterials.

Purpose of the Study:

• To develop and characterize a novel pectin/fibroin microgel system.
• To investigate physical and enzymatic cross-linking mechanisms in pectin/fibroin microgels.
• To assess the mechanical properties, degradation, and biocompatibility of the microgels for tissue engineering.

Main Methods:

• Fabrication of pectin/fibroin microgels using droplet-based microfluidics.
• Analysis of microgel secondary structure using spectroscopic techniques.
• Measurement of mechanical properties (Young's modulus) and enzymatic degradation profiles.
• Assessment of cell viability using Alamar Blue assay with human pulmonary fibroblasts.

Main Results:

• Pectin/fibroin microgels were successfully fabricated with an ordered β-sheet secondary structure.
• Mechanical analysis revealed a Young's modulus in the range of 10 to 20 kPa.
• Enzymatic degradation was effectively promoted using protease enzymes.
• The microgels demonstrated good biocompatibility with human pulmonary fibroblasts.

Conclusions:

• The developed pectin/fibroin microgels represent a highly functional hybrid biomaterial.
• These microgels, derived from waste sugar beet pectin and silk fibroin, offer a sustainable approach to biomaterial production.
• The demonstrated cell compatibility and tunable degradation highlight their potential for tissue engineering applications.