期刊
LANGMUIR
卷 32, 期 10, 页码 2436-2444出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.langmuir.5b03830
关键词
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资金
- Konrad-Adenauer-Stiftung
- Deutsche Forschungsgemeinschaft [SFB 803, A05]
- Fonds der Chemischen Industrie (Dozentenstipendium)
- Max Planck society
The molecular interactions of three biologically important galactocerebrosides have been studied in monolayers formed at the soft air/water interface as 2D model membranes. Highly surface-sensitive techniques as GIXD (grazing incidence X-ray diffraction), IRRAS (infrared reflection absorption spectroscopy), and BAM (Brewster angle microscopy) have been used. The study reveals that small differences in the chemical structure have a relevant impact on the physical chemical properties and intermolecular interactions. The presence of a 2-D-hydroxyl group in the fatty acid favored for GalCer C24:0 (2-0H) monolayers a higher hydration state of the headgroup at low lateral pressures (<25 mN/m) and a higher condensation effect above 30 mN/m. An opposite behavior was recorded for GalCer 024:0 and GalCer C24:1, for which the intermolecular interactions are defined by the weakly hydrated but strong H-bonded interconnected head groups. Additionally, the 15-cis-double bond in the fatty acid chain (nervonic acid) of GalCer C24:1 stabilized the LE phase but did not disturb the packing parameters of the LC phase as compared with the saturated compound GalCer C24:0.
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