Science
Mechanism of Action
This ingredient functions as an anionic surfactant, actively lowering the surface tension between disparate substances like water and oil. Its mechanism involves creating micelles that effectively encapsulate and suspend oily impurities and dirt, allowing them to be thoroughly rinsed away from the skin or hair.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Key findings
- 01 Research on related dodecylbenzenesulfonate salts indicated severe irritation to rabbit skin when applied at a 15% concentration. Irritant effects are consistent with other detergents, with severity directly proportional to concentration and significantly influenced by pH.
Transparency
Dusting Analysis
As a cleansing surfactant, Sodium Tridecylbenzenesulfonate's utility is not tied to a specific active ingredient threshold for direct skin treatment; its efficacy is inherent to its presence in wash-off formulations for cleansing.
The Formula
Formulation
Stability
This ingredient demonstrates robust stability in a broad pH range, including in the presence of strong acidic and basic environments. A 1% aqueous solution typically registers a pH between 7.0 and 9.0.
Conflicts
- Formulation at elevated concentrations, particularly above 15% (based on analogous compounds), substantially increases the potential for skin irritation.
- Deviation from the optimal pH range of 7-9 can significantly exacerbate its irritant properties.
- High activity slurries (>50%) may necessitate the inclusion of hydrotropes, such as sodium xylene sulfonate, to ensure stable handling.
Safety
Safety Profile
The CIR Expert Panel has deemed alkylbenzene sulfonate salts, including Sodium Tridecylbenzenesulfonate, safe for use in cosmetics under conditions where they are formulated to be non-irritating. The potential for irritation is highly contingent on the ingredient's concentration and the product's pH. The FDA permits its use as an indirect food additive (emulsifier/surface-active agent).
Your Skin
Skin Compatibility
Our Assessment
Verdict
While an effective cleansing surfactant, Sodium Tridecylbenzenesulfonate's significant irritation potential, especially at higher concentrations and suboptimal pH, positions it as a questionable choice for precision skincare unless meticulously formulated within strict parameters for rinse-off applications.
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References
Sources