Avobenzone - UVA Filter for Sunscreen and Photoprotection

Avobenzone (Butyl Methoxydibenzoylmethane) CAS 70356-09-1

1. Chemical Nature and Applications

Avobenzone is a dibenzoylmethane derivative. It is one of the few available solutions focused on absorbing long-wave UVA radiation. Due to this property, it is capable of preventing photoaging and unwanted pigmentation.

Category: Organic UVA filters.

Role: Protection of the epidermis from deep-reaching rays.

2. Synonyms and Names

• Russian: Авобензон

• English: Avobenzone, Parsol 1789, Butyl Methoxydibenzoylmethane

• International references: Avobenzone

3. Physicochemical Characteristics

Molecular formula: C₂₀H₂₂O₃

Appearance: Crystalline powder ranging from yellow to light brown.

Odor: Weak, without sharp notes.

Density: ~1.06 g/cm³.

Melting point: 81–86°C.

Solubility: Insoluble in water; soluble in ethanol, isopropanol, and oils.

Decomposition: Prone to photochemical degradation, therefore requiring special stabilizing components.

Storage conditions: Dry, dark place, cool temperature, preferably not exceeding 25°C.

Stability: Enhanced when using modern technological solutions (encapsulation, combination with octocrylene).

4. Key Aspects of Use

Broad UVA coverage: Up to 400 nm, providing good protection in anti-aging cosmetics.

Combination with UVB filters: Typically mixed with oxybenzone, octocrylene, octisalate, and other substances for full SPF.

Protective additives: Antioxidants (vitamin E, ferulic acid) mitigate oxidative degradation.

5. Environmental and Hygienic Parameters

Safety: When used within regulations, generally does not cause dermatological complications. However, individual sensitivity may occur in some cases.

Environmental impact: Effects on marine flora and fauna, particularly on phytoplankton and corals, are being studied, but direct evidence of strong negative impact is less than for some other UV filters.

6. Conclusion

Avobenzone (CAS 70356-09-1) is an essential component in the arsenal of modern sunscreen products, providing deep UVA spectrum coverage. Despite its vulnerability to photodegradation, properly formulated products address this issue, ensuring long-term effectiveness and a high level of skin protection against premature aging.