Functional Analysis and Extraction of Rice Proteins
Summary
Rice proteins, comprising glutelin, prolamin, globulin and albumin fractions, have garnered significant interest owing to their hypoallergenic nature and balanced amino acid profile. Functional analysis encompasses the elucidation of structural features—such as secondary structure, hydrophobicity and disulfide cross-linking—through spectroscopic and calorimetric techniques to relate conformation to solubility, emulsifying, foaming and gelling behaviour. Extraction methodologies range from conventional alkaline solubilisation to enzyme-assisted, ultrasound or high-pressure processes designed to maximise yield while preserving functionality. Optimised extraction enhances nutritional and techno-functional attributes, facilitating applications in gluten-free formulations, infant nutrition and plant-based meat analogues. Thermal and mechanical treatments, including extrusion and domestic cooking, further modulate protein structure and digestibility, underscoring the need to tailor processing conditions to achieve desired health and sensory outcomes.
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Functional Analysis and Extraction of Rice Proteins publication trend
The graph below shows the total number of articles in functional analysis and extraction of rice proteins across all publications each year (not limited to Nature Index journals).
Technical terms
Alkaline extraction: A solubilisation method using high pH to dissociate proteins from rice matrices, improving yield but potentially altering functional groups.
Enzyme-assisted extraction: A targeted approach employing specific hydrolases to release proteins under mild conditions, enhancing purity and preserving structure.
Prolamin: A class of rice seed storage protein rich in proline and glutamine, characterised by low water solubility and high resistance to proteolysis.
Glutelin: The major rice storage protein fraction, soluble in dilute acids or alkali, contributing to nutritional quality and forming the bulk of extracted protein.
Emulsification: The capacity of protein molecules to stabilise oil-in-water interfaces, critical for the manufacture of sauces, dressings and dairy alternatives.
Foaming capacity: The ability of proteins to form and stabilise air-in-water foams, relevant for aerated food products such as mousses and baked goods.
Digestibility: The proportion of protein broken down and absorbed during gastrointestinal processing, influencing bioavailability of amino acids.
Disulfide bond cross-linking: Covalent linkages between cysteine residues that stabilise tertiary protein structure, affecting solubility and resistance to enzymatic degradation.
References
- Structural Changes in Rice Bran Protein upon Different Extrusion Temperatures: A Raman Spectroscopy Study. Journal of Chemistry (2016).
- A Narrative Review on Rice Proteins: Current Scenario and Food Industrial Application. Polymers (2022).
- Effect of domestic cooking on rice protein digestibility. Food Science & Nutrition (2019).
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