Acting as a non-ionic surfactant and viscosity-increasing agent, this fatty acid amide stabilizes foam and enhances the sensory profile of cleansing formulations. It is primarily valued in the cosmetic industry for its ability to transform thin liquid soaps into rich, dense lathers.
- INCI Name:
- Lauramide DEA
- Chemical/Scientific Name:
- N,N-Bis(2-hydroxyethyl)dodecanamide
- Common Aliases:
- Lauric Diethanolamide, Lauryl Diethanolamide, Lauroyl Diethanolamide
| Category: | Surface-Active Substances |
| Source Origin: | Synthetic (derived from Lauric Acid) |
| Comedogenic Rating: | 0 |
| Primary Industries: | Personal Care, Industrial Cleaning, Textiles |
| Solubility: | Oil-soluble; dispersible in water with surfactants |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Formula Stability: | |
| Irritation Risk: |
Primary Benefits:
- Creates dense, stable foam that does not collapse quickly during use.
- Increases the viscosity of aqueous surfactant systems, improving product “pour.”
- Provides a slight superfatting effect to mitigate the harshness of primary detergents.
Potential Risks:
- Risk of nitrosamine formation if the raw material contains excessive residual diethanolamine.
- Potential for mild skin and eye irritation at high concentrations.
Biological Action & Cosmetic Profile
Molecular structures like Lauramide DEA function by reducing the surface tension of water, allowing it to mix more effectively with oils and debris. As a non-ionic surfactant, it does not carry a charge in solution, which makes it exceptionally compatible with anionic surfactants like sodium laureth sulfate. When integrated into a cleansing system, it arranges itself at the air-water interface to strengthen the film around air bubbles, resulting in a more luxurious and creamy lather.
Rheological modification is a secondary but critical function of this compound. In the presence of electrolytes like sodium chloride, it promotes the formation of rod-like micelles rather than spherical ones. These elongated structures tangle easily, which significantly increases the “body” or thickness of shampoos, body washes, and facial cleansers. This thickening occurs without the need for high-heat processing, making it a favorite for cold-process manufacturing.
Broader Applications & Origins
Synthesis typically involves the reaction of Lauric Acid—often sourced from Coconut Oil—with diethanolamine. While it is most visible in hair care and hand soaps, its emulsifying properties also find utility in industrial lubricants and textile processing. In these contexts, it prevents the separation of oil and water phases while providing corrosion inhibition for metal surfaces.
Routine Integration
Synergies:
- Anionic Surfactants: Dramatically boosts the viscosity and foam volume of sulfate-based cleansers.
- Conditioning Polymers: Works with Polyquaternium 10 to improve the “feel” of hair during rinsing.
- Humectants: Pairs well with Glycerin to ensure a non-stripping cleanse.
Conflicts:
- Nitrosating Agents: Must not be used in formulations containing 2-bromo-2-nitropropane-1,3-diol (Bronopol) or other nitrogen-donating preservatives to prevent the formation of carcinogenic nitrosamines.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated Lauramide DEA multiple times, concluding it is safe for use in rinse-off products and safe at concentrations up to 10% in leave-on applications. However, a strict caveat exists: it must not be part of formulations where N-nitroso compounds can form. European Union regulations (Annex III) also limit the level of free diethanolamine in the finished product to 0.5% and mandate that the final formulation be nitrosamine-free. Dermatological studies indicate it is a weak sensitizer, with most irritation cases linked to the presence of residual amines rather than the amide itself.
Is Lauramide DEA safe for sensitive skin?
While generally safe in rinse-off products, individuals with highly reactive skin or known allergies to alkanolamines should exercise caution. Most irritation occurs only when the product is left on the skin for extended periods or if the formulation is poorly balanced.
Why is there controversy regarding “DEA” ingredients?
Concerns stem from the potential for secondary amines to react with nitrosating agents to create nitrosamines, which are carcinogenic. Modern cosmetic chemistry avoids this by using high-purity raw materials and avoiding incompatible preservative systems.
Is this ingredient vegan?
Lauramide DEA is typically considered vegan as the fatty acids are derived from plant oils like coconut or palm, and the amine component is synthetically produced.