Lyotropic Lipo-Amino-Acids: Synthesis and Structural Study

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Abstract
Lyotropic lipo-amino-acids C n (AA) where AA is one of the following amino-acids: glycine, alanine, sarcosine, serine, tyrosine, lysine, hydroxyethyl-glutamine, hydroxypropylglutamine, hydroxypentyl-glutamine and glutamic acid, and C n is a paraffinic chain with 12 or 18 carbon atoms have been synthesized. The study by X-ray diffraction of the lipo-amino-acids in concentrated water solution and in the anhydrous state has shown the existence of two types of mesophases: lamellar and hexagonal. The respective influence of the water concentration, the nature of the amino-acid and the length of the paraffinic chain on the domain of stability of the mesophases and on the values of their structural parameters has been established.