Intermolecular interactions and phase structures of plasticized wheat proteins materials

Area of Science:

• Food Science and Technology
• Materials Science
• Biochemistry

Background:

• Wheat proteins are crucial food components with complex structures.
• Understanding their interactions with plasticizers is key to tailoring material properties.
• Thermal processing and plasticization significantly influence protein behavior.

Purpose of the Study:

• To investigate intermolecular interactions and phase structures in thermally processed wheat proteins.
• To correlate nanoscale phase structures with mechanical properties using plasticizers.
• To elucidate the role of hydrogen bonding and component mobility in material performance.

Main Methods:

• Dynamic Mechanical Analysis (DMA) to assess mechanical properties.
• Solid-state high-resolution Nuclear Magnetic Resonance (NMR) spectroscopy to study molecular motion and interactions.
• Analysis of phase structures from molecular to tens of nanometers.

Main Results:

• Strong hydrogen bonding between wheat proteins and plasticizers (glycerol, water) altered molecular motions.
• Plasticized systems exhibited a wide distribution of chain mobility (molecular to 20-30 nm).
• Heterogeneous systems (vital wheat gluten, deamidated wheat proteins) showed superior tensile strength and elasticity compared to homogeneous systems.

Conclusions:

• Intermolecular hydrogen bonding and component interactions are critical for wheat protein material properties.
• Heterogeneity at the nanoscale, driven by specific protein components, contributes to excellent mechanical performance.
• The findings offer insights into designing advanced wheat protein-based materials.