5 Strategies to protect the sensory properties of cosmetic extracts

Minimising oxygen exposure
Thermal control in critical process stages
Protection against light during processing and storage
Formulation optimisation: pH, matrix and compatibility
Structural protection systems: encapsulation
Comparison of encapsulation techniques

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.

4. Formulation optimisation: pH, matrix and ingredient compatibility

What does it address? Unwanted interactions between the extract and the cosmetic matrix. How is it implemented?

pH adjustment within stability-compatible ranges.
Evaluation of surfactants, polymers and lipid phases that may bind aroma compounds.
Removal of catalytic metal traces through filtration or chelating agents.

Sensory benefit Prevents loss of intensity and limits secondary degradation reactions.

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 CO? 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