Sodium Benzotriazolyl Butylphenol Sulfonate is a specialized UV absorber designed to protect cosmetic formulations from light-induced degradation. By neutralizing ultraviolet radiation within the container, this stabilizer prevents color fading, scent alteration, and the breakdown of light-sensitive active ingredients.
- INCI Name:
- Sodium Benzotriazolyl Butylphenol Sulfonate
- Chemical/Scientific Name:
- Sodium 3-(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate
- Common Aliases:
- Benzotriazolyl Dodecyl p-Cresol, Tinogard HS
| Category: | Stabilizers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Cosmetics, Personal Care, Household Detergents |
| Solubility: | Water-soluble |
At a Glance: Properties & Effects
| Formula Stability: | |
| Texture Enhancement: | |
| Irritation Risk: |
Primary Benefits:
- Prevents discoloration of products in clear or translucent packaging.
- Protects botanical extracts and vitamins from photo-oxidation.
- Maintains the integrity of complex Fragrance profiles.
- Ensures consistent shelf-life performance in varied lighting conditions.
Potential Risks:
- Negligible risk of skin irritation at standard formulation percentages.
- Environmental bioaccumulation concerns are monitored but currently meet regulatory standards.
Biological Action & Cosmetic Profile
Light-induced degradation often compromises the efficacy and aesthetic appeal of water-based products containing Aqua and high-polarity solvents. When UV rays penetrate a cosmetic bottle, they can excite electrons in sensitive molecules, leading to the formation of free radicals. These radicals initiate chain reactions that break down preservatives, dyes, and active substances like Ascorbic Acid. This sulfonate derivative acts as a broadband UV filter for the formula itself, absorbing high-energy photons and dissipating them as low-energy heat before they can interact with other ingredients.Formulators utilize this ingredient because of its superior water solubility compared to traditional oil-soluble UV absorbers. It is particularly effective in transparent gels, shampoos, and aqueous serums where clarity is a priority. Beyond simple color protection, the molecule stabilizes the chemical structure of antioxidants, ensuring that the consumer receives the full potency of the product’s active claims even months after opening.
Broader Applications & Origins
While primarily recognized in the personal care industry, this chemical stabilizer also finds extensive use in household cleaning products and high-end laundry detergents. It is synthesized through a multi-step process involving the sulfonation of benzotriazole derivatives, resulting in a highly stable, anionic molecule. Its development was driven by the need for light protection in products that contain Alcohol Denat or high concentrations of surfactants, where other stabilizers might precipitate or fail to integrate.
Routine Integration
Synergies:
- Antioxidants: Enhances the longevity of Tocopherol and other radical scavengers in the bottle.
- Chelating Agents: Works alongside Disodium Edta to provide comprehensive protection against light and metal-ion catalyzed oxidation.
- Synthetic Colorants: Essential for maintaining the vibrant hues of products containing acid dyes.
Conflicts:
- No known major cosmetic ingredient conflicts; however, pH extremes may influence its solubility in rare cases.
Clinical Consensus & Safety
Dermatological safety assessments by the Cosmetic Ingredient Review (CIR) Expert Panel and European regulatory bodies indicate that this ingredient is safe for use in rinse-off and leave-on cosmetics at concentrations typically ranging from 0.01% to 0.1%. It is not classified as a skin sensitizer or a significant irritant. Because its molecular weight and ionic nature limit skin penetration, it poses minimal risk for systemic toxicity. Although it functions as a UV absorber, it is not an approved active sunscreen filter for protecting the skin from sunburn and should not be relied upon for UV protection of the human epidermis.
Does this ingredient provide SPF protection for my skin?
No. While it absorbs UV light, its function is strictly to protect the product formulation from degrading. You must still apply a dedicated sunscreen containing active filters like Zinc Oxide or Avobenzone for skin protection.
Why is this ingredient in my clear facial serum?
Clear serums are highly susceptible to light damage. This stabilizer is included to ensure that the active ingredients and the clear appearance of the serum do not change or turn yellow when exposed to bathroom lights or sunlight.
Is it safe for those with sensitive skin?
Yes. Clinical data suggests it has a very low potential for irritation or allergic reaction, largely because it remains on the surface of the skin and is used in very small quantities.