Chemical Modification of Protein Isolates for Functional Enhancement

Chemical modification of protein isolates has emerged as a versatile strategy to tailor and enhance the functional properties of food and pharmaceutical proteins. Isolates, typically purified protein fractions obtained from plant or animal sources, often suffer from limited solubility, thermal stability, emulsifying or foaming capacity. By introducing specific chemical moieties—such as succinyl, acetyl or lipidic groups—through controlled reactions, researchers modulate protein surface charge, hydrophobicity and conformational flexibility. These modifications can shift isoelectric points, improve interfacial activity and prevent aggregation under stress conditions, thereby expanding the applicability of protein isolates in complex formulations. Recent advances have refined reaction parameters to achieve targeted degrees of modification while preserving bioactivity, paving the way for functional protein ingredients in fortified foods, encapsulation systems and novel delivery platforms across global markets.

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Chemical Modification of Protein Isolates for Functional Enhancement publication trend

The graph below shows the total number of articles in chemical modification of protein isolates for functional enhancement across all publications each year (not limited to Nature Index journals).

Technical terms

Protein isolate: A purified protein fraction separated from the source matrix, typically containing over 90% protein by dry weight.

Succinylation: A chemical reaction that attaches succinyl groups to amino residues, increasing net negative charge and modifying solubility and interfacial behaviour.

Acetylation: The covalent addition of acetyl groups to protein amino functions, used to alter surface charge and conformational stability.

Emulsifying activity index: A quantitative measure of a protein’s ability to facilitate and stabilise oil–water emulsions.

Zeta potential: The electrical potential at the slipping plane of a particle in suspension, indicative of colloidal stability.

Pickering emulsion: An emulsion stabilised by solid particles adsorbed at the interface rather than by surfactants, enhancing stability against coalescence.

References

1. Lactoferrin thermal stabilization and iron(II) fortification through ternary complex fabrication with succinylated sodium caseinate. Food Chemistry X (2024).
2. Octenyl succinylation of myofibrillar protein: Structural, physicochemical and emulsifying properties. LWT (2024).
3. Succinylation Modified Ovalbumin: Structural, Interfacial, and Functional Properties. Foods (2022).