Dissolution and regeneration of collagen fibers using ionic liquid

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Textile Engineering

Background:

• Collagen is a crucial structural protein in skin with applications in biomaterials.
• Dissolving and regenerating collagen is challenging due to its stable triple helix structure.
• Ionic liquids offer potential for dissolving biomacromolecules.

Purpose of the Study:

• To investigate the dissolution of native skin collagen in the ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIM]Cl).
• To characterize the structural changes of collagen during dissolution and regeneration.
• To explore the preparation of collagen-based materials and composites.

Main Methods:

• Dissolution of collagen fibers in [BMIM]Cl.
• Regeneration of collagen using various precipitators.
• Characterization using polarized optical microscopy, FTIR, and XRD.
• Evaluation of film-forming ability and thermostability.

Main Results:

• [BMIM]Cl successfully dissolved collagen, destroying its crystalline structure upon heating.
• Collagen's triple helical structure was partly destroyed during dissolution and regeneration.
• Regenerated collagen's properties (film formation, thermostability) depended on the precipitating agent.
• Collagen/cellulose composites were prepared in film, fiber, and gel forms.

Conclusions:

• [BMIM]Cl is an effective medium for dissolving collagen and preparing collagen/cellulose composites.
• The dissolution-regeneration process alters collagen's structure and properties.
• Precipitation conditions are critical for controlling the characteristics of regenerated collagen materials.