Understanding like-charge attraction in protein-surfactant-polyelectrolyte mixtures for improved laundry detergents
We have recently reported that addition of anionic polyelectrolyte sodium polyacrylate (NaPA) to solutions of anionic surfactants (SLES) enhances their detergency if divalent ions are present. This boost in washing performance was found to be even larger in the presence of a protease enzyme, which is a common ingredient in laundry detergents. While a NaPA solution shows little detergency, its addition to either a surfactant solution or a surfactant-enzyme mixture in the presence of divalent ions was able to boost their performance by a factor of 2. It was proposed that the mechanism involves the formation of surface-active calcium bridged NaPA-SLES aggregates. This proposal seeks to understand the molecular origin underpinning this effect by use of selectively contrast matched surfactants, polymers and proteins. We aim to obtain an experimental validation of the polymer-surfactant aggregates observed in molecular dynamics simulations and extend the measurements to a more complex system including an enzyme, which is relevant to real laundry detergents.
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Carlos G. Lopez; RICHTERING Walter; M. Friederike Schulte; SCHWEINS Ralf and Andrea Scotti. (2020). Understanding like-charge attraction in protein-surfactant-polyelectrolyte mixtures for improved laundry detergents. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-580
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