Abstract: Engineering Surfactant-Polyelectrolyte interactions for enhanced deposition and substantivity on solid substrates like hair or skin plays a critical role in providing consumer perceivable benefits such as hair conditioning or efficacy of delivery of various skin care actives.  The deposition performance depends on both formulation conditions (electrolyte levels, surfactant/polyelectrolyte ratios etc) and surface conditions of the substrate (charge, hydrophobicity etc).  Despite this critical performance aspect, a detailed understanding of the deposition controlling formulation design rules are still not well developed. This study will highlight the applicability of a novel technique-nanoplasmonic sensing in providing new insights that will allow the development of these performance controlling design rules. The study will highlight novel insights generated for a common shampoo surfactant base-Sodium Laurel Ether Sulfate (SLES) -Cocoamidopropyl Betaine (CAPB)-Merquat system.  In addition insights on novel sustainable biosurfactant-biopolymer system will additionally be shown.

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