All-natural bio-plastics using starch-betaglucan composites

Area of Science:

• Materials Science
• Polymer Science
• Biotechnology

Background:

• Grain polysaccharides are sustainable feedstocks for advanced, eco-friendly plastics.
• Thermoplastic starch (TPS) requires modification or blending for enhanced properties.
• All-natural, compostable bioplastics can be developed by blending different polysaccharides.

Purpose of the Study:

• To investigate the potential of a maize starch (ST) and oat beta-glucan (BG) composite system for producing bio-plastic films.
• To optimize the ST:BG ratios for casting bio-plastic prototypes.
• To evaluate the effect of BG content on the physical and structural properties of ST-based bio-plastics.

Main Methods:

• Fabrication of bio-plastic prototype films using various ST:BG ratios (100:0 to 0:100) with glycerol as a plasticizer.
• Characterization using Electron Paramagnetic Resonance (EPR) with TEMPO spin probe to assess the chemical environment.
• Analysis of mechanical properties (stress, strain, brittleness) and structural properties (crystallinity) using Wide-Angle X-ray Diffraction (WAXD).

Main Results:

• Composite films with higher BG content exhibited a more flexible chemical environment.
• Increased BG content led to reduced brittleness and improved cohesiveness.
• Films with higher BG content showed enhanced stress and strain values at break and decreased crystallinity.

Conclusions:

• Blending starch with other natural polysaccharides, like oat beta-glucan, is an effective strategy to improve bio-plastic functionality.
• The ST:BG composite system offers a promising route for developing high-performance, all-natural, and compostable bio-plastics.
• This approach provides a valuable alternative to conventional plastics and modified starch-based materials.