Protein Gelation Dynamics in Food Systems

Protein gelation in food systems is a process by which soluble proteins transform into three-dimensional networks that entrap water and other components, giving rise to a gel structure. This transformation is driven by the partial unfolding of protein molecules, exposure of reactive sites and subsequent aggregation through non-covalent forces (hydrophobic interactions, hydrogen bonds, electrostatic attractions) and covalent cross-links (notably disulfide bonds). The kinetics and final architecture of the network are governed by processing parameters such as temperature, pH, ionic strength and shear, as well as by intrinsic protein characteristics including amino acid composition, molecular weight and source. In dairy products, heat-induced whey protein gels illustrate the interplay of denaturation and aggregation, while in plant-based systems soy, pea and mung bean proteins have been tailored to mimic traditional textures. Control over gel microstructure influences water-holding capacity, texture, viscoelasticity and sensory attributes, with implications for low-fat formulations, meat analogues, dairy alternatives and encapsulation of bioactives. Emerging techniques such as controlled coacervation, enzymatic cross-linking and industrial modification protocols expand the toolbox for designing gels with bespoke mechanical properties and functional performance. Understanding gelation dynamics at molecular and network scales is crucial for innovation in sustainable and health-oriented food products.

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Protein Gelation Dynamics in Food Systems publication trend

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Technical terms

Gelation: The process by which solubilised proteins self-assemble into a continuous network that immobilises water and other solutes, forming a gel.

Rheology: The study of deformation and flow in materials; in gels it refers to measurements of elastic (G′) and viscous (G″) moduli to characterise texture and stability.

Isoelectric point: The pH at which a protein carries no net charge, minimizing solubility and often promoting aggregation and gel formation.

Coacervation: A liquid–liquid phase separation driven by electrostatic interactions or charge screening, yielding protein-rich droplets that can be hardened into microgels.

Disulfide bond: A covalent linkage between cysteine residues that stabilises protein aggregates and reinforces gel network strength.

References

1. Optimising Soy and Pea Protein Gelation to Obtain Hydrogels Intended as Precursors of Food-Grade Dried Porous Materials. Gels (2023).
2. Impacts of Industrial Modification on the Structure and Gel Features of Soy Protein Isolate and its Composite Gel with Myofibrillar Protein. Foods (2023).
3. Soluble protein particles produced directly from mung bean flour by simple coacervation. Food Hydrocolloids (2023).