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Record number 63348
Title Carbon-13 nuclear magnetic relaxation in supercooled liquid and glassy maltose
Author(s) Tromp, R.H.; Dusschoten, D.; Parker, R.; Ring, S.G.
Source Physical Chemistry Chemical Physics 1 (1999). - ISSN 1463-9076 - p. 1927 - 1931.
Department(s) Biophysics
Publication type Refereed Article in a scientific journal
Publication year 1999
Abstract 13C longitudinal relaxation rates (T1-1) in highly viscous liquid and solid amorphous maltose, its mixtures with water and methanol, and also crystalline maltose monohydrate, have been measured as a function of temperature, above and below the calorimetric glass transition temperatures of the amorphous materials. From the results it is concluded that, at temperatures up to 60°C below the glass transition temperature, the carbon atoms in the exocyclic hydroxymethyl groups of maltose are more mobile than the endocyclic carbon atoms. A few percent of water is sufficient to considerably enhance amorphous maltose mobility. At temperatures close to the glass transition methanol in amorphous maltose-methanol mixtures retains a high degree of rotational mobility which is decoupled from the bulk viscosity.
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