Microencapsulation Techniques for Legume Proteins

Microencapsulation represents a suite of technologies designed to envelop bioactive compounds within a protective matrix, thereby enhancing stability, controlling release and masking undesired tastes or odours. Legume proteins, including those derived from peas, lentils, chickpeas and soy, have attracted considerable interest as wall materials owing to their film-forming capacity, functional versatility and sustainable sourcing. The diversity of microencapsulation techniques can be broadly classified into physico-chemical, mechanical and combined approaches. Spray drying remains one of the most widely adopted methods, where an emulsion or solution of legume protein and core material is atomised into a drying chamber to yield fine powder particles. Coacervation—either simple or complex—exploits electrostatic interactions between legume proteins and oppositely charged polymers to generate microcapsules with tunable size and permeability. Ionic gelation relies on the crosslinking of protein networks via divalent cations, permitting encapsulation under mild conditions suitable for thermally sensitive payloads. Emerging green technologies, such as freeze drying, supercritical fluid processes and electrohydrodynamic atomisation, offer added control over particle morphology and size, albeit often at higher cost or lower throughput. Optimisation of legume protein extraction, pH, ionic strength and thermal pre-treatment is critical to tailoring the interfacial properties, encapsulation efficiency and release kinetics. Taken together, these advances have expanded the utility of legume-based microcapsules in functional food, nutraceutical and pharmaceutical formulations, underpinning global efforts to develop plant-based delivery systems that marry sustainability with performance.

Research from Nature Portfolio

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Research from all publishers

A 2023 analysis of vegetable proteins as encapsulating agents has documented the shifting paradigm towards eco-friendly processes, emphasising the role of pea and soy storage globulins in spray drying and coacervation. This work highlights how protein composition influences particle size distribution, environmental stability and encapsulation of lipid-soluble vitamins. In parallel, a 2021 review has underscored the encapsulating properties of legume proteins, detailing how functional modifications—such as hydrolysis and Maillard conjugation—improve film formation, enhance resistance to gastric conditions and enable controlled release of antioxidants and probiotics. Complementing these surveys, a 2020 experimental study applied ionic gelation to encapsulate annatto seed extracts within lentil, quinoa and soy protein matrices. Findings demonstrated encapsulation efficiencies up to 80 %, with thermal assays revealing that protein-based capsules substantially preserved polyphenols and colourants during storage at elevated temperatures, thereby illustrating the practical viability of mild component-specific methods.

Microencapsulation Techniques for Legume Proteins publication trend

The graph below shows the total number of articles in microencapsulation techniques for legume proteins across all publications each year (not limited to Nature Index journals).

Technical terms

Microencapsulation: Enclosure of active substances within a polymeric or proteinaceous shell to protect and control release.

Spray drying: Rapid dehydration of a liquid feed by atomisation into a hot gas stream to form dry particles.

Coacervation: Phase separation induced by electrostatic interactions between oppositely charged biopolymers to form microcapsules.

Ionic gelation: Gel network formation through crosslinking of biopolymers by multivalent ions at ambient conditions.

Wall material: The encapsulating agent, here legume proteins, providing structural integrity and protective properties.

Encapsulation efficiency: Percentage of core material successfully entrapped within the microcapsules relative to the initial amount.

References

1. Vegetable proteins as encapsulating agents: Recent updates and future perspectives. Food Science & Nutrition (2023).
2. ENCAPSULATING PROPERTIES OF LEGUME PROTEINS: RECENT UPDATES & PERSPECTIVES. International Journal of Food Properties (2021).
3. Use of Plant Proteins as Microencapsulating Agents of Bioactive Compounds Extracted from Annatto Seeds (Bixa orellana L.). Antioxidants (2020).