title: NMR study of the adsorption-desorption kinetics of dissolved tetraalanine in MCM-41 mesoporous material.
abstract: In this study we show how deuterium magic-angle spinning NMR spectroscopy can be used to investigate the adsorption-desorption kinetics of molecules in solution at surface-liquid interfaces. An aqueous solution of deuterium-labeled tetraalanine is inserted in the pores of MCM-41 mesoporous material, and its 2H MAS NMR spectrum is measured as a function of temperature and fraction of filling of the pores. Prior to this study, the different types of water in MCM-41 are characterized as a function of water loading of the pores. Analysis of 2H MAS sideband line shapes enabled the determination of the adsorption and desorption rates and the activation energies of desorption.
authors.affiliation: Weizmann Institute of Science, Department of Chemical Physics and Chemical Research Support Unit, Rehovot 76100, Israel.
authors.forename: Silvia
authors.initials: S
authors.lastname: Pizzanelli
authors.forename: Shifi
authors.initials: S
authors.lastname: Kababya
authors.forename: Veronica
authors.initials: V
authors.lastname: Frydman
authors.forename: Miron
authors.initials: M
authors.lastname: Landau
authors.forename: Shimon
authors.initials: S
authors.lastname: Vega
mesh_terms: D000327:Adsorption; D000409:Alanine / Q000031:analogs & derivatives* / Q000493:pharmacokinetics*; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012996:Solutions; D014867:Water / Q000737:chemistry
chemical_list: C509968:MCM-41; D012996:Solutions; D014867:Water; D012822:Silicon Dioxide; D000409:Alanine