Silk dissolution and regeneration at the nanofibril scale

Area of Science:

• Materials Science
• Biomaterials Engineering
• Textile Science

Background:

• Native silk's remarkable properties stem from its hierarchical nanofibril structure.
• Understanding silk's nanoscale architecture is key to unlocking its full potential.

Purpose of the Study:

• To develop a method for dissolving native silk into its constituent nanofibrils.
• To investigate the controlled dissolution and regeneration of silk fibroin (SF) at the nanofibril level.
• To enable the creation of advanced silk-based materials.

Main Methods:

• Degumming silk fibers using sodium carbonate (Na2CO3) to control dissolution behavior.
• Dissolving degummed silk in a salt-formic acid (FA) solution, specifically calcium chloride-formic acid (CaCl2-FA).
• Analyzing the impact of Na2CO3 and CaCl2 concentrations on silk dissolution and nanofibril preservation.

Main Results:

• Successfully obtained silk fibroin (SF) nanofibrils by breaking hydrogen bonds in crystalline regions while preserving nanofibril structures.
• Demonstrated that silk dissolution is controllable via Na2CO3 and CaCl2 concentrations.
• Produced high-strength films and electrospun nanofibres with nanofibrous structures from the SF nanofibril solution.

Conclusions:

• A novel method for dissolving and regenerating silk at the nanofibril scale was established.
• This approach provides new insights for preparing high-quality silk materials.
• The findings open avenues for silk applications in high-tech fields.