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Moumoujus

PEG-8 UNDECYLENATE.

Valuable / SURFACTANT - EMULSIFYING

PEG-8 Undecylenate is a versatile ingredient that functions primarily as a surfactant and emulsifier, stabilizing oil-in-water formulations. Its PEG component provides humectant and solvent properties, while the undecylenate portion contributes potential antimicrobial benefits. It enhances product texture and supports the dispersion of other ingredients.

Summary

Emulsifying agent Surfactant Humectant Solvent Solubilizer (for perfume oils, colorants, active ingredients) Consistency enhancer Binding agent Softening agent Fixative Antimicrobial properties

Science

Mechanism of Action

This ingredient operates through a dual-action mechanism. As a surfactant and emulsifier, it reduces surface tension and enables the stable mixing of immiscible oil and water phases, forming consistent emulsions. The polyethylene glycol (PEG) segment attracts and retains moisture, acting as a humectant, and serves as a solvent, improving product texture and potentially enhancing the penetration of other active compounds. The undecylenate portion, derived from undecylenic acid, is recognized for its inherent antimicrobial characteristics.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

No data available to suggest PEG-8 Undecylenate is commonly 'dusted' or marketed with unsubstantiated claims of efficacy at low concentrations.

The Formula

Formulation

Solubility
Water
Optimal pH 5.5 – 7
0 7 14

Stability

Aqueous solutions containing the PEG-8 component demonstrate general stability at ambient temperatures, with PEG bonds resistant to hydrolysis under these conditions. Dissolution in warm water (80-90°C) is permissible without immediate degradation. However, prolonged exposure to warm temperatures, light, and oxygen can accelerate aging effects, leading to an increase in aldehydes, carboxylates, and peroxides, alongside increased ionic strength and a reduction in pH.

Conflicts

  • Phenol
  • Sorbitol
  • Tannic acid
  • Salicylic acid
  • May affect integrity of certain plastics
  • May reduce antimicrobial action of other preservatives
  • Penicillin
  • Bacitracin

Safety

Safety Profile

CIR Status
Safe as used
Sensitization risk Unknown

The Cosmetic Ingredient Review (CIR) Expert Panel deemed PEG-8 Undecylenate safe for use in cosmetic applications in 2000. However, the CIR advises against using PEG-based antimicrobial preparations on compromised or damaged skin due to a general concern for potential kidney damage associated with PEGs. Trace amounts of 1,4-dioxane, an ethoxylation by-product, may be present, but this can be effectively managed through appropriate purification processes during manufacturing.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Unknown
Comedogenicity Unknown

Our Assessment

Verdict

Valuable

PEG-8 Undecylenate is a valuable ingredient for formulation, offering emulsifying, humectant, and solvent benefits, alongside potential antimicrobial action, with a well-established safety profile for healthy skin.

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