Infrared membrane spectroscopy.
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Amides↗
Biomedical subjects
H H Günthard
Publications and source records attributed to H H Günthard.
Hydration sites of egg phosphatidylcholine determined by means of modulated excitation infrared spectroscopy.
Conventional and modulated excitation infrared spectra of egg phosphatidylcholine are measured in the spectral range of 4000-900 cm-1 by modulation of relative humidity with an amplitude of +/- less than 5% at a mean value of 75% (T=30 degrees C). From the modulated-excitation spectrum, hydration sites are found to be the greater than PO2 group, the greater than C=O group and the choline group.
Binding Sites↗
Instability of Langmuir-Blodgett layers of barium stearate, cadmium arachidate and tripalmitin, studied by means of electron microscopy and infrared spectroscopy.
Results of an investigation of the stability of n-layers of barium stearate, cadmium arachidate and tripalmitin by means of electron microscopy and attenuated total reflection infrared spectroscopy are reported. Odd and even numbered barium starate n-layers with n - 1,2,3,4,5 are found to rearrange spontaneously from a regular film into ultrastructures of irregular, flat islands of varying thickness. The kinetics of the phase transformation of the first layer depends on the substrate, that of n-layers appears to be dependent on n, the temperature, and the surrounding medium. The kinetic behaviour of odd and even numbered layers is distinctly different. Similar studies on cadmium arachidate layers reveal much slower kinetics of the rearrangement process. In the case of tripalmitin n-layers it is shown that electron microscopy and infrared spectroscopy yield valuable complementary information about ultrastructure and molecular structure of the layers in correlation with the rearrangement process, which also occurs with this system. Consequences of the results of this paper for work published in various fields are briefly discussed.
Barium↗