Amino-acid based surfactant monolayers and their mixtures
Bioderived surfactants are becoming increasingly of interest to provide biodegradable amphiphiles from non-petrochemical sources. Ideally they should be derived from waste, so as not to impact upon food chains or the wider environment. However waste products generally contain mixtures of species, and separations are energy intensive, and costly. Here we begin a study on bioderived amino-acid based surfactants, ultimately to be made from grain residue wastes. Initially to understand the behaviour of these amphiphiles, we have prepared pure selectively deuterated C20-tail amino acid headgroup (glycine, proline, glutamine) surfactants. Since little is reported on their physicochemical properties we will first study these as Langmuir films using neutron reflectivity to determine layer thickness, headgroup orientation and spacings. Once individual components are characterised we will study the binary & ternary mixtures of these species to determine mixing behaviour, and structures formed in the mixed monolayers. This will provide information towards our ultimate goal to use amino acid mixtures to directly prepare surfactant mixtures with no purification, for use in formulation.
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Karen J Edler; ARNOLD Tom; Richard A. Campbell; DI Andi and ELSTONE Naomi. (2016). Amino-acid based surfactant monolayers and their mixtures. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-10-1463
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