Aggregates and gel network structure of globin hydrolysates

Area of Science:

• Biomaterials Science
• Protein Chemistry
• Materials Science

Background:

• Globin hydrolysates can form gels with desirable functional properties.
• Understanding the structural basis of these gels is crucial for optimizing their applications.

Purpose of the Study:

• To directly observe and characterize the intermediate aggregates and gel network structures of globin hydrolysates using electron microscopy.
• To validate a proposed model for the formation and structure of the globin hydrolysate gel network.

Main Methods:

• Preparation of a gel from globin hydrolysates.
• Direct structural observation of intermediate aggregates and gel network using electron microscopy.
• Analysis of aggregate dimensions, composition, and formation mechanisms.

Main Results:

• Intermediate aggregates were observed as thin rods (130-140 nm length, 4-5 nm diameter).
• Each aggregate unit comprised beta-chain and peptide beta-1 (1:1 ratio, MW 26922 Da, diameter 4.1 nm).
• Hydrophobic interactions mediated aggregate formation, with length >30-33 times the diameter. A cross-linked network involving peptide alpha-1 and rod-shaped aggregates was confirmed.

Conclusions:

• The electron microscopy findings directly support the previously proposed model for globin hydrolysate gel network formation.
• The study elucidates the detailed structure of intermediate aggregates and their role in gelation.
• This structural insight aids in understanding and controlling the functional properties of globin-based gels.