The low-wavenumber Raman (LWR) scattering from aqueous solutions of glucose, fructose, trehalose, and dextran have been investigated in the 10–60 °C range at three different sugar concentrations. The spectra below 250 cm−1 have been analyzed in terms of the imaginary part of the dynamical susceptibility and described by the sum of quasi-elastic (QE) and inelastic (IE) contributions. The subtraction of the QE scattering shows the presence of two bands representing bending-like and stretching-like modes of tetrahedral H-bonded structures of liquid water. The differences of IE profiles in solutions and in the pure solvent have been discussed in terms of perturbations operated by sugar on the tetrahedral arrangement of H-bonded network in liquid water.
Low-wavenumber Raman scattering from aqueous solutions of carbohydrates
PERTICAROLI, STEFANIA;SASSI, Paola;MORRESI, Assunta;PAOLANTONI, Marco
2008
Abstract
The low-wavenumber Raman (LWR) scattering from aqueous solutions of glucose, fructose, trehalose, and dextran have been investigated in the 10–60 °C range at three different sugar concentrations. The spectra below 250 cm−1 have been analyzed in terms of the imaginary part of the dynamical susceptibility and described by the sum of quasi-elastic (QE) and inelastic (IE) contributions. The subtraction of the QE scattering shows the presence of two bands representing bending-like and stretching-like modes of tetrahedral H-bonded structures of liquid water. The differences of IE profiles in solutions and in the pure solvent have been discussed in terms of perturbations operated by sugar on the tetrahedral arrangement of H-bonded network in liquid water.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
