title: 1H NMR diffusometry study of water in casein dispersions and gels.
abstract: The self-diffusion coefficients of water in casein solutions and gels were measured using a pulsed-gradient spin-echo nuclear magnetic resonance technique (PGSE NMR). The dependence of the self-diffusion coefficient of water on the concentration and structure of casein is reported. The results were analyzed using a cell model. It was found that the water self-diffusion coefficient is insensitive to the structure of the casein in solution or in a gelled state. The influence of casein concentration on the water self-diffusion coefficient could be explained by obstruction from the casein molecule. Assuming a simple model with two water regions, each characterized by a specific water concentration and value of the water diffusion coefficient, the water mobility reduction induced by the casein can be rationalized.
authors.affiliation: Cemagref, UR Technologie des Equipements Agro-alimentaires, CS 64426, 17 Avenue de Cucillé, 35044 Rennes, Cedex, France. francois.mariette@cemagref.fr
authors.forename: François
authors.initials: F
authors.lastname: Mariette
authors.forename: Daniel
authors.initials: D
authors.lastname: Topgaard
authors.forename: Bengt
authors.initials: B
authors.lastname: Jönsson
authors.forename: Olle
authors.initials: O
authors.lastname: Soderman
mesh_terms: D002364:Caseins / Q000737:chemistry*; D004058:Diffusion; D005782:Gels; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008433:Mathematics; D012996:Solutions; D013329:Structure-Activity Relationship; D014867:Water / Q000737:chemistry*
chemical_list: D002364:Caseins; D005782:Gels; D012996:Solutions; D014867:Water