Structure and Orientation Changes of ω-and γ-Gliadins at the Air-Water Interface : A PM-IRRAS Spectroscopy and Brewster Angle Microscopy Study
Résumé
Microscopic and molecular structures of ω- and γ-gliadin monolayers at the air-water interface were studied under compression by three complementary techniques: compression isotherms, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and Brewster angle microscopy (BAM). For high molecular areas, gliadin films are homogeneous, and a flat orientation of secondary structures relative to the interface is observed. With increasing compression, the nature and orientation of secondary structures changed to minimize the interfacial area. The γ-gliadin film is the most stable at the air-water interface; its interfacial volume is constant with increasing compression, contrary to ω-gliadin films whose molecules are forced out of the interface. γ-Gliadin stability at a high level of compression is interpreted by a stacking model.
Origine : Fichiers produits par l'(les) auteur(s)
Loading...