Nanoparticle Encapsulation of Bioactive Compounds

Nanoparticle encapsulation has emerged as a transformative strategy for the protection and delivery of bioactive compounds that are inherently unstable, poorly soluble or susceptible to rapid degradation. By entrapping vitamins, polyphenols, carotenoids and other health‐promoting molecules within submicrometre carriers, researchers have achieved marked improvements in aqueous dispersibility, oxidative stability and controlled release. A diverse palette of materials, including biodegradable polymers (for example, zein, ethylcellulose), lipid matrices (such as solid lipid nanoparticles, liposomes and nanoemulsions) and hybrid organic–inorganic constructs, has been tailored to meet the physicochemical demands of individual actives. Preparation techniques ranging from solvent displacement and emulsion-diffusion to microfluidics and spray-drying enable precise control over particle size, surface charge and encapsulation efficiency.

Applications span the food, pharmaceutical and cosmetic sectors, where encapsulated nutraceuticals can bolster functional foods, targeted drug carriers can minimise off-target effects and cosmetic formulations can benefit from enhanced photostability of natural antioxidants. Global interest is driven by the need to address micronutrient deficiencies, improve therapeutic indices of poorly bioavailable drugs and develop sustainable delivery platforms. Interdisciplinary collaborations have linked advances in colloid science, polymer chemistry and biophysics, yielding carriers that respond to pH shifts, enzymatic cues or external stimuli for site-specific release. Despite rapid progress, challenges remain in scaling production, ensuring batch-to-batch reproducibility and navigating complex regulatory landscapes.

Research from Nature Portfolio

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Nanoparticle Encapsulation of Bioactive Compounds publication trend

The graph below shows the total number of articles in nanoparticle encapsulation of bioactive compounds across all publications each year (not limited to Nature Index journals).

Technical terms

Nanoparticle encapsulation: The incorporation of active molecules within carriers sized between 1 nm and 1 µm to improve stability, solubility and targeted release.

Nanoemulsion: A kinetically stable dispersion of two immiscible liquids (oil and water) with droplet sizes typically below 200 nm, stabilised by surfactants or biopolymers.

Encapsulation efficiency: The percentage of a bioactive compound successfully entrapped within a carrier relative to the initial amount added during formulation.

Bioaccessibility: The fraction of an encapsulated compound that is released from its carrier and solubilised in the gastrointestinal milieu, making it potentially available for absorption.

Zeta potential: A measure of the surface charge of nanoparticles, which influences colloidal stability and interactions with biological interfaces.

References

1. Bio-Based Nanoparticles as a Carrier of β-Carotene: Production, Characterisation and In Vitro Gastrointestinal Digestion. Molecules (2020).
2. Encapsulation of β-Carotene in Oil-in-Water Emulsions Containing Nanocellulose: Impact on Emulsion Properties, In Vitro Digestion, and Bioaccessibility. Polymers (2022).
3. The Addition of Resveratrol-Loaded Emulsions to Yogurts: Physicochemical Characterization, In Vitro Bioaccessibility and NMR-Based Nutritional Profiles. Foods (2024).