Enhanced perfume surface delivery to interfaces using surfactant surface multilayer structures

Abstract

Enhanced surface delivery and retention of perfumes at interfaces are the keys to their more effective and efficient deployment in a wide range of home and personal care related formulations. It has been previously demonstrated that the addition of multivalent counterions, notably Ca(2+), induces multilayer adsorption at the air-water interface for the anionic surfactant, sodium dodecyl-6-benzenesulfonate, LAS-6. Neutron reflectivity, NR, measurements are reported here which demonstrate that such surfactant surface multilayer structures are a potentially promising vehicle for enhanced delivery of perfumes to interfaces. The data show that the incorporation of the model perfumes, phenylethanol, PE, and linalool, LL, into the surface multilayer structure formed by LAS-6/Ca(2+) results in the surface structures being retained up to relatively high perfume mole fractions. Furthermore the amount of perfume at the surface is enhanced by at least an order of magnitude, compared to that co-adsorbed with a surfactant monolayer.

Interaction of testosterone-based compounds with dodecyl sulphate monolayers at the air–water interface

“…However, as is the case with MD simulations, very little research has been reported on the interactions of small molecules and surfactant monolayers. The experimental investigations that have been reported were focussed on oil 44,45 and fragrance 46,47 molecules. Only recently have we reported an interdisciplinary investigation of a drug molecule with a SDS monolayer 48 .…”

Aggregation and Rheological Behavior of the Lavender Oil–Pluronic P123 Microemulsions in Water–Ethanol Mixed Solvents

“…A loss of volatile compounds, declines their commercial value . Therefore, special aqueous based solubilization and delivery systems − have been proposed for fragrant molecules to thwart their chemical instability, enhance their water solubility, and decrease their volatility for persistent fragrance over longer times. Surfactant aided microencapsulation is becoming increasingly important owing to good capability for solubilization, stabilization, and controlled transport of volatile fragrant molecules. − Recently, neutron reflectivity was utilized by Bradbury et al , and Penfold et al , to explore the coadsorption at the air–solution interface of some perfume molecules for optimizing their performance in different formulations.…”

Multivalent counterion induced multilayer adsorption at the air-water interface in dilute Aerosol-OT solutions

“…Finally the results further illustrate the rich opportunities for the manipulation of the surface properties in such systems, in the applications related to adjusting wetting behaviour and efficient enhanced interfacial delivery (3)(4)(5), and in enhancing emulsification and solubilisation properties (28). The potential applications at the air-…”

“…It provides the opportunity to manipulate wetting properties in many diverse applications. The surface multilayer structures also provide an efficient near surface reservoir for rapid, enhanced and prolonged delivery of other active agents in formulations, for example, in perfume delivery (4,5). Furthermore it offers greater opportunities for improved solubilisation properties and more effective emulsification.…”