Evaluation of Sericin/Polyvinyl Alcohol Mixtures for Developing Porous and Stable Structures

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Textile Engineering

Background:

• Silk processing generates fibrous by-products rich in sericin (SS) and fibroin.
• Sericin possesses valuable properties like antioxidant, antibacterial, and biocompatible characteristics.
• SS's functional groups enable blending and crosslinking with other polymers for enhanced material properties.

Purpose of the Study:

• To investigate the impact of varying silk sericin (SS) and polyvinyl alcohol (PVA) ratios on porous scaffold properties.
• To evaluate the mechanical stability, water absorption, and protein release of SS/PVA scaffolds in phosphate-buffered saline (PBS).

Main Methods:

• Fabrication of porous SS/PVA scaffolds using freeze-drying technique.
• Systematic variation of SS/PVA ratios to create different composite materials.
• Characterization of scaffold morphology, mechanical performance, water uptake, thermal stability, and protein release.

Main Results:

• Higher SS content reduced scaffold porosity, while increased PVA content led to material folding.
• Enhanced PVA content improved water absorption, mechanical strength, and thermal stability of the scaffolds.
• Increased PVA content correlated with a decrease in sericin protein release.

Conclusions:

• The SS/PVA ratio is a critical factor in tailoring scaffold properties for biomedical uses.
• Optimized SS/PVA scaffolds demonstrate tunable characteristics suitable for various biomedical applications.
• This research highlights the potential of utilizing silk by-products in advanced biomaterials.