Preserving the sensory properties of cosmetic extracts — including aroma, colour and freshness — requires a direct intervention on the physical and chemical mechanisms that drive degradation.
For highly sensitive ingredients, structural protection strategies such as encapsulation play a key role in isolating volatile compounds and maintaining their integrity throughout the product life cycle.Below are the main technical strategies commonly applied in the cosmetic sector to reinforce the stability of sensory properties in natural extracts.
1. Minimising oxygen exposure
What does it address?
Oxidative degradation of aromatic compounds and natural colourants.
How is it implemented?
- Closed processing systems or inert atmospheres.
- Vacuum-controlled equipment with nitrogen purging.
- Barrier packaging materials with low oxygen permeability.
Sensory benefit
Preserves freshness and prevents the development of rancid or off-odours.
2. Thermal control in critical process stages
What does it address?
Thermal degradation of volatile and thermolabile compounds.
How is it implemented?
- Low-temperature extraction and concentration technologies.
- Controlled heating during blending and processing.
- Stable temperature profiles during storage and logistics.
Sensory benefit
Protects volatile fractions and prevents simplification of the aromatic profile.
3. Protection against light during processing and storage
What does it address?
Photodegradation caused by UV and high-energy visible radiation.
How is it implemented?
- Controlled lighting conditions in production areas.
- UV filtering systems or red-light environments.
- Opaque packaging or materials with UV-blocking additives.
Sensory benefit
Maintains colour stability and prevents photo-induced off-notes.
5. Structural protection systems: encapsulation and controlled release
What does it address?
High sensitivity of extracts to oxygen, light and temperature.
How is it implemented?
- Microencapsulation via drying, coacervation or gelation.
- Double encapsulation systems for highly volatile extracts.
- Polymeric matrices with controlled release behaviour.
Sensory benefit
Enhanced stability, protection against oxidation and optimised release in the final formulation.
6. Comparison of encapsulation techniques
| Technique |
Best suited for |
Key advantages |
| Spray chilling |
Oils and lipophilic fragrances |
High stability; moisture barrier; temperature-triggered release |
| Spray drying with organic solvents |
Thermosensitive actives |
Low thermal stress; particle size control |
| Ionic gelation |
Water-soluble actives and plant extracts |
Mild conditions; good oxidative protection; controlled release |
| Supercritical CO₂ encapsulation |
Delicate fragrances and terpenes |
No organic solvents; minimal oxidation; excellent aroma preservation |
| Microcapsule agglomeration |
Fine powders and difficult-to-handle ingredients |
Improved handling; better redispersion; adjustable final particle size |
