Lipase-surfactant interactions studied by neutron reflectivity and ellipsometry

Article Abstract:

Neutron reflectivity was applied in studying the interaction between a microbial lipase and an anionic and a cationic surfactant at the air-water interface. Ellipsometry was then applied to study the interface between water and a hydrophobic solid surface using the same enzyme-surfactants used earlier. The results from both experiments, which were in very good agreement, showed that lipase adsorbs quickly at the interfaces and that sodium dodecyl sulfate does not react strongly with the lipase at low concentration.

Lipid research, Ionic solutions, Ionic mobility

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Investigation of the molecular motion of self-assembled fatty acid films

Article Abstract:

A study was conducted to analyze self-assembled stearic acid films adsorbed on an Al2O3 film using electron paramagnetic resonance and near-edge X-ray absorption fine structure spectroscopy. The HETGM2 monochromator was utilized to obtain the the near-edge X-ray absorption fine structure spectra. Experimental results indicated the possibility of preparing self-assembled monolayers supporting magnetically almost independent spin-labels for concentrations of the molecules lower than 10% in the solution.

Fatty acids, Molecular dynamics, Electron paramagnetic resonance, Semiconductor films

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