Soluble saccharides are abundant in the sea surface microlayer and even more so in sea spray aerosols. In bulk sea water, these saccharides are present in a sub-ten micromolar concentration, but at the ocean surface these soluble sugars are enriched 1-16x fold relative to sodium. We have experimentally investigated this phenomenon using a cooperative adsorption mechanism. Cooperative adsorption describes an interaction between an insoluble Langmuir film adsorbed to the aqueous/vapor interface and soluble organics that would normally not be enriched at the surface. This interaction is studied with surface specific techniques including sum frequency generation vibrational spectroscopy (SFG-VS) and surface tension measurements. We studied the changes in biologically relevant lipid monolayers (DPPC and DMPE) in the presence of different saccharides including glucuronic acid and trehalose. These saccharides cause structural changes in the lipid monolayers indicating cooperative adsorption. Differential scanning calorimetry was used to examine changes in lipid bilayers due to the presence of these saccharides. Glucuronic acid causes DPPC’s gel-liquid crystalline transition temperature to separate into two distinct transition temperatures that both increase as a function of glucuronic acid concentration.<br/>

Interfacial behavior between lipid films and soluble saccharides: A cooperative adsorption model

2019 Spring National Meeting

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