Formulation Design for a Completely Natural Shampoo | AIChE

Formulation Design for a Completely Natural Shampoo


Xu, L. - Presenter, Manhattan College
Amin, S., Manhattan College
The future of personal care and detergent products is the elimination of non-biodegradable, environmentally
toxic surfactants. However, prior to that, an understanding of how performance criteria such as rheology is
effected by substitution of traditional surfactants with biosurfactants is required. In this study, the effect of
rhamnolipids (RLs) biosurfactant on the rheological response of traditional surfactants such as sodium laureth
sulfate (SLES) and cocamidopropyl betaine (CAPB) is explored. In addition, sophorolipids (SLs) were
introduced along-side with rhamnolipids to replace SLES/CAPB and form a completely natural shampoo. By
utilizing mechanical rheometry and optical microrheometry, this study provides unique insights into
microstructure-rheology linkages in complex biosurfactant-surfactant mixtures. Macro/microrheometry indicates
biosurfactants/surfactants and mono/di-rhamnolipid ratio plays a critical role in the rheological response. Size
data extracted from high frequency rheological responses indicates RLs concentration, electrostatic screening
and pH has a significant impact on micelles structure. Mixture viscosity can be built up to a certain extent by
adding salt and adjusting pH. A completely natural shampoo can be achieved by addition of hyaluronic acid
(HA) to the RLs/SLs biosurfactants system. Effect of HA on the RLs/SLs system’s rheology and microstructure
will be further explored. We acknowledge LS Instruments, Evonik, and Lubrizol for making this project possible.