The temperature-composition phase diagram and mesophase structure characterization of monopentadecenoin in water.
AUTOR(ES)
Briggs, J
RESUMO
The temperature-composition phase diagram of monopentadecenoin, a monoacylglycerol with a cis monounsaturated fatty acid 15 carbon atoms long (C15:1c10) in water was constructed using x-ray diffraction. Low- and wide-angle diffraction patterns were collected from samples of fixed hydration as a function of temperature in the heating direction on x-ray-sensitive film. The temperature and hydration ranges investigated were 0-104 degrees C and 0-60% (w/w) water, respectively. The phases identified in the system include the lamellar crystalline phase, the lamellar liquid crystalline phase, the fluid isotropic phase, and two inverted cubic phases belonging to space groups la3d (Q230) and Pn3m (Q244). Particular attention has been devoted to the issues of phase equilibrium, phase boundary verification, and structure characterization. The phase diagrams of monopentadecenoin, monomyristolein (C14:1c9), and monoolein (C18:1c9) are compared, and the impact of molecular structure on mesophase stability and structure is discussed.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1225521Documentos Relacionados
- Characterization of microemulsion structures in the pseudoternary phase diagram of isopropyl palmitate/water/Brij 97:1-butanol
- Structure and function of carboxypeptidase A alpha in supercooled water.
- Effect of high temperature on infectivity of Cryptosporidium parvum oocysts in water.
- Roles of subcutaneous fat and thermoregulatory reflexes in determining ability to stabilize body temperature in water.
- Characterization of dysgonic, heterotrophic bacteria from drinking water.