Mild Syndet Surfactant Cleansing & Cutaneous Microbiome Integrity (Engineering Review 2020)
Traditional soaps solubilize vital epidermal barrier lipids; engineered synthetic detergents (syndets) cleanse while preserving skin barrier homeostasis.
Engineering Mechanism & Kinetic Flowchart
Critical Micelle Concentration (CMC) Optimization
Monomeric surfactant molecules cause irritation by inserting into cellular membranes. Combining anionic sodium cocoyl isethionate with amphoteric cocamidopropyl betaine and non-ionic alkyl polyglucosides lowers the CMC, promoting the assembly of large, non-penetrating mixed micelles.
Acid Mantle Homeostasis
Formulating cleansers strictly at pH 5.0–5.5 maintains activity of epidermal lipid processing enzymes (beta-glucocerebrosidase and acid sphingomyelinase), preventing alkaline swelling of corneocyte desmosomes.
Microbiome Preservation
A physiologically buffered wash preserves resident commensals (*Staphylococcus epidermidis*), which secrete antimicrobial peptides (AMPs like lugdunin) to prevent dysbiotic overgrowth of pathogenic *Staphylococcus aureus*.
Pharmacist-Biochemist · Specialist in Cosmetic Engineering & Dermato-Pharmacology · Published on September 14, 2020 at 18:32
