Microencapsulation Techniques for Food Applications

Microencapsulation encompasses a suite of technologies designed to entrap food‐grade active compounds within protective coatings, thereby enhancing their stability, bioavailability and controlled release. Core–shell structures are achieved through physical, physico‐chemical or chemical approaches that tailor capsule size, morphology and barrier properties to specific ingredients and processing conditions. Predominant methods include spray drying, freeze drying, extrusion, complex coacervation and fluidised-bed coating, each offering distinct advantages in terms of scalability, cost and compatibility with sensitive bioactives. Selection of wall materials – from proteins and polysaccharides to lipid-based matrices and inorganic shells – governs encapsulation efficiency, mechanical strength and release kinetics. In food systems, these techniques serve to mask undesirable tastes, protect antioxidants, vitamins, flavours and probiotics from degradation, and deliver functional ingredients in a targeted manner. Innovations increasingly focus on biodegradable and regulatory-compliant materials, minimising environmental impact while meeting consumer demand for clean-label products. Integration of microfluidics and novel crosslinking chemistries allows finer control over particle size distribution, uniformity and triggered release, opening avenues for next-generation functional foods with enhanced nutritional and sensory attributes.

Research from Nature Portfolio

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Research from all publishers

Emerging microscale delivery systems have been developed to address the inherent instability of hydrophilic actives in functional food formulations. Recent work on engineered microspheres, microneedles and micropatches employs biodegradable polymer blends to achieve high encapsulation efficiency and sustained release under varying pH and temperature conditions. Advances in spray-drying and nano-spray-drying technologies have optimised parameters such as inlet/outlet temperature, total solids content and atomisation methods, yielding powders with preserved antioxidant and nutritional profiles of lipophilic actives like β-carotene and essential oils. Studies on hybrid wall matrices – combining maltodextrin, plant proteins and polysaccharides – demonstrate improved retention of phenolic compounds from citrus and pomace extracts during both spray-drying and freeze-drying, while controlling moisture content, water activity and particle morphology to enhance flowability and shelf stability. These developments underscore a trend towards multi-functional capsules capable of protecting sensitive bioactives, modulating release in complex food matrices and facilitating industrial scalability.

Microencapsulation Techniques for Food Applications publication trend

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

Technical terms

Microencapsulation: Process of enclosing active compounds within a secondary material to form micro-scale capsules for protection and controlled release.

Spray drying: Technique in which a liquid feed is atomised into hot air, rapidly evaporating solvent and forming dry microcapsules.

Complex coacervation: Physico-chemical method that uses electrostatic interactions between oppositely charged polymers to form a coating around a core.

Wall material: Encapsulating substance (e.g. proteins, polysaccharides, lipids) that forms the capsule shell and determines barrier and release properties.

Encapsulation efficiency: Proportion of active compound successfully retained within the capsule relative to the total amount used in the process.

Controlled release: Designed delivery mechanism by which an encapsulated compound is released at a predetermined rate or in response to specific triggers.

References

1. Microencapsulation: An overview on concepts, methods, properties and applications in foods. Food Frontiers (2021).
2. Microscale Delivery Systems for Hydrophilic Active Ingredients in Functional Consumer Goods. Wiley Interdisciplinary Reviews Nanomedicine and Nanobiotechnology (2025).
3. Encapsulation of Active Ingredients in Food Industry by Spray-Drying and Nano Spray-Drying Technologies. Processes (2020).
4. Encapsulation of Citrus By-Product Extracts by Spray-Drying and Freeze-Drying Using Combinations of Maltodextrin with Soybean Protein and ι-Carrageenan. Foods (2018).