A designed biosurfactant protein for switchable foam control
Middelberg, Anton P. J. and Dimitrijev-Dwyer, Mirjana (2011) A designed biosurfactant protein for switchable foam control. ChemPhysChem, 128: 1426-1429.
Making and breaking foams: A facile method for foam control is reported using a designed biosurfactant. The new biosurfactant is based on a four-helix bundle design which is interfacially active across a broad pH range. At pH 8.5 stable foam forms, yet decreasing the pH to 7.5 causes rapid foam dissipation. This unique behaviour can be linked to subtle molecular and specific-ion effects which lead to switchable changes in the state of the foam thin film (see picture)