Science
Mechanism of Action
As an anionic surfactant from the Linear Alkylbenzene Sulfonate (LAS) family, Isopropylamine Dodecylbenzenesulfonate features a distinct amphiphilic molecular structure, comprising a hydrophilic sulfonate head and a hydrophobic alkylbenzene tail. This allows it to significantly lower the interfacial tension between oil and water, facilitating the emulsification of oils and the suspension of dirt for efficient rinsing. At its Critical Micelle Concentration (CMC), it forms micelles that encapsulate and lift lipophilic particles from surfaces. It also functions as an effective emulsifier, promoting the stable dispersion of immiscible liquids.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 A 1% Linear Alkylbenzene Sulfonate solution was observed to induce moderate to intense erythema in all human subjects within a 48-hour period.
- 02 At 15% concentrations, sodium dodecylbenzenesulfonate, a structurally related compound, demonstrated severe irritation to rabbit skin.
- 03 An aqueous solution of 12.5 mmol (~0.44% w/v) Sodium Dodecylbenzenesulfonate, a related compound, caused minimal redness in nearly 70% of human subjects.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The irritant properties of this ingredient are highly dependent on both its concentration and the formulation's pH. Achieving optimal pH values and specific surfactant concentrations is crucial for maximizing formulation stability and minimizing potential irritation.
Conflicts
- Acids (reacts as a base, neutralizing acids and generating heat)
Safety
Safety Profile
The CIR Expert Panel concluded that Isopropylamine Dodecylbenzenesulfonate and related linear alkylbenzenesulfonates are safe for use in cosmetics when specifically formulated to be non-irritating. Its irritant potential is comparable to other detergents, with severity directly influenced by concentration and pH. Formulations containing this ingredient must be designed to minimize irritancy. The FDA permits salts of n-alkylbenzenesulfonic acid, including this compound, as indirect food additives for emulsification and surface activity, and Sodium Dodecylbenzenesulfonate is recognized as a secondary direct food additive for fruit and vegetable peeling.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While effective as a cleansing agent and emulsifier, Isopropylamine Dodecylbenzenesulfonate presents a high irritancy potential at concentrations as low as 1%, requiring extremely careful formulation to be non-irritating for precision skincare applications.
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