An Integrated Quasi-Elastic Light-Scattering, Pulse-Gradient-Spin−Echo Study on the Transport Properties of α,α-Trehalose, Sucrose, and Maltose Deuterium Oxide Solutions
| Autor: | Luciano Galantini, E. Tettamanti, Emilia Iannilli and, Salvatore Magazù |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
DYNAMICS
TREHALOSE AQUEOUS-SOLUTIONS Chromatography PROTEINS Chemistry TREHALOSE AQUEOUS-SOLUTIONS SELF-DIFFUSION HYDRATION WATER SIMULATION DYNAMICS PROTEINS HYDRATION Dispersity Analytical chemistry Disaccharide Hard spheres Maltose Trehalose Surfaces Coatings and Films Dilution chemistry.chemical_compound Deuterium SELF-DIFFUSION SIMULATION Materials Chemistry Spin echo WATER Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry B. 105:12143-12149 |
| ISSN: | 1520-5207 1520-6106 |
| DOI: | 10.1021/jp011275j |
| Popis: | A study on D2O solutions of trehalose, maltose, and sucrose have been performed by using quasi-elastic light-scattering (QELS) and 1H and 2H pulse-gradient-spin−echo NMR (PGSE-NMR). The self-diffusion coefficient of disaccharide (D) and the apparent diffusion coefficient Dapp have been obtained as a function of disaccharide weight fraction c and temperature (20−60 °C). Hydrodynamic radii at infinite dilution have been evaluated. In case of trehalose and sucrose a model of monodisperse hard spheres has been used to interpret the concentration dependence of D and Dapp in the dilute region (c ≤ 0.1), thus obtaining the values of the hydrodynamic radii together with the diffusing particles volume fractions as a function of c and T. The invariance of the hydrodynamic radii and the agreement with the model suggest that T and c neither induce self-aggregation of the sugars nor affect sensitively their structure and hydration. The self-diffusion coefficient of D2O (Ds) at 20 °C has also been measured for the D2O ... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|