title: Conformational changes in stratum corneum lipids by effect of bicellar systems.
abstract: Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy was applied to study the effects of the bicelles formed by dimyristoyl-glycero-phosphocholine (DMPC) and dihexanoyl-glycero-phosphocholine (DHPC) in porcine stratum corneum (SC) in vitro. A comparison of skin samples treated and untreated with bicelles at different temperatures was carried out. The analysis of variations after treatment in the position of the symmetric CH2 stretching, CH2 scissoring, and CH2 rocking vibrations reported important information about the effect of bicelles on the skin. Bicellar systems caused a phase transition from the gel or solid state to the liquid crystalline state in the lipid conformation of SC, reflecting the major order-disorder transition from hexagonally packed to disordered chains. Grazing incidence small and wide X-ray scattering (GISAXS and GIWAXS) techniques confirmed this effect of bicelles on the SC. These results are probably related to with the permeabilizing effect previously described for the DMPC/DHPC bicelles.
authors.affiliation: Departament de Tecnologia Química i de Tensioactius, Institut de Química Avancada de Catalunya (IQAC), Consejo Superior de Investigaciones Cientificas (CSIC), C/ Jordi Girona 18-26, 08034 Barcelona, Spain. gelen.rodriguez@iiqab.csic.es
authors.forename: Gelen
authors.initials: G
authors.lastname: Rodríguez
authors.forename: Lucyanna
authors.initials: L
authors.lastname: Barbosa-Barros
authors.forename: Laia
authors.initials: L
authors.lastname: Rubio
authors.forename: Mercedes
authors.initials: M
authors.lastname: Cócera
authors.forename: Avencia
authors.initials: A
authors.lastname: Díez
authors.forename: Joan
authors.initials: J
authors.lastname: Estelrich
authors.forename: Ramon
authors.initials: R
authors.lastname: Pons
authors.forename: Jaume
authors.initials: J
authors.lastname: Caelles
authors.forename: Alfonso
authors.initials: A
authors.lastname: De la Maza
authors.forename: Olga
authors.initials: O
authors.lastname: López
mesh_terms: D000818:Animals; D004134:Dimyristoylphosphatidylcholine / Q000737:chemistry; D004817:Epidermis / Q000737:chemistry*; D008055:Lipids / Q000737:chemistry*; D044367:Phase Transition; D010742:Phospholipid Ethers / Q000737:chemistry; D012881:Skin Temperature; D017550:Spectroscopy, Fourier Transform Infrared; D013552:Swine; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: C052298:1,2-dihexadecyl-sn-glycero-3-phosphocholine; D008055:Lipids; D010742:Phospholipid Ethers; D004134:Dimyristoylphosphatidylcholine