title: Study and formation of vesicle systems with low polydispersity index by ultrasound method.
abstract: The formation of liposomes with low polydispersity index by application of ultrasounds was investigated considering methodology specifications such as sonication time and sonication power. Phosphatidylcholine (PC) liposomes were formed by the evaporation-hydration method. The vesicles were sonicated using several sonication conditions. The liposomes were then characterized by dynamic light scattering (DLS) and freeze-fracture electron microscopy (FFEM). Correlation functions from DLS were treated by cumulants method and GENDIST to obtain the mean radius and polydispersity index. These calculations allowed to fix an optimal sonication time (3000 s) and a useful interval of ultrasound power between 39 and 91 W. DLS and FFEM results confirmed that vesicle size, lamellarity and the polydispersity index decreased with the increase of sonication power. Thus, we propose a systematic method to form liposomes in which the physical characteristics of the vesicles may be controlled as a function of sonication time and power.
authors.affiliation: Departamento de Tecnología de Tensioactivos, Instituto de Investigaciones Químicas y Ambientales de Barcelona (I.I.Q.A.B.)-Consejo Superior de Investigaciones Científicas (C.S.I.C.), Calle Jorge Girona 18-26, 08034 Barcelona, Spain. jplten@iiqab.csic.es
authors.forename: J
authors.initials: J
authors.lastname: Pereira-Lachataignerais
authors.forename: R
authors.initials: R
authors.lastname: Pons
authors.forename: P
authors.initials: P
authors.lastname: Panizza
authors.forename: L
authors.initials: L
authors.lastname: Courbin
authors.forename: J
authors.initials: J
authors.lastname: Rouch
authors.forename: O
authors.initials: O
authors.lastname: López
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D008081:Liposomes / Q000737:chemistry*; D008854:Microscopy, Electron; D008956:Models, Chemical; D010316:Particle Size; D010713:Phosphatidylcholines / Q000737:chemistry*; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D012996:Solutions / Q000737:chemistry; D013010:Sonication; D013499:Surface Properties; D013997:Time Factors; D014465:Ultrasonics
chemical_list: D008081:Liposomes; D010713:Phosphatidylcholines; D012996:Solutions