Synthesis and mesomorphic properties of glycosyl dialkyl- and diacyl-glycerols bearing saturated, unsaturated and methyl branched fatty acid and fatty alcohol chains. Part II. Mesomorphic properties.
Chem Phys Lipids
; 135(1): 15-26, 2005 May.
Article
em En
| MEDLINE
| ID: mdl-15854622
ABSTRACT
The biophysical properties of a series of glycosyl dialkyl- and diacyl-glycerols bearing unsaturated or chiral methyl branched chains in the tail, and di- and trisaccharide carbohydrate headgroups are described. Thermotropism was investigated by polarising microscopy, the lyotropism was investigated by small angle X-ray diffraction and by the contact preparation method, and the gel to liquid crystalline phase transition by FT-IR-spectroscopy. The compounds displayed thermotropic Smectic A (SmA), cubic and columnar phases, whereas in the lyotropic phase diagram lamellar, hexagonal and cubic phases are found. The introduction of unsaturated or methyl branched chains leads to liquid crystallinity at ambient temperature. The difference between the 1,3-oleyl-glycerol maltoside and the corresponding 1,2-oleoyl-glycerol maltoside is small.
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01-internacional
Base de dados:
MEDLINE
Assunto principal:
Cristalização
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Ácidos Graxos
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Álcoois Graxos
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Glicerol
Tipo de estudo:
Evaluation_studies
Idioma:
En
Revista:
Chem Phys Lipids
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Alemanha