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Titolo:
An integrated quasi-elastic light-scattering, pulse-gradient-spin-echo study on the transport properties of alpha,alpha-trehalose, sucrose, and maltose deuterium oxide solutions
Autore:
Iannilli, E; Tettamanti, E; Galantini, L; Magazu, S;
Indirizzi:
Univ Roma La Sapienza, Dipartimento Chim, I-00185 Rome, Italy Univ Roma LaSapienza Rome Italy I-00185 mento Chim, I-00185 Rome, Italy Univ Aquila, Dipartimento Fis, Ist Nazl Fis Mat, I-67010 Coppito, Italy Univ Aquila Coppito Italy I-67010 t Nazl Fis Mat, I-67010 Coppito, Italy Univ Messina, Dipartimento Fis, I-98166 Messina, Italy Univ Messina Messina Italy I-98166 artimento Fis, I-98166 Messina, Italy Univ Messina, INFM, I-98166 Sant Agata Di Messina, Italy Univ Messina Sant Agata Di Messina Italy I-98166 Agata Di Messina, Italy
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 48, volume: 105, anno: 2001,
pagine: 12143 - 12149
SICI:
1520-6106(200112)105:48<12143:AIQLPS>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
TREHALOSE AQUEOUS-SOLUTIONS; SELF-DIFFUSION; HYDRATION; WATER; SIMULATION; DYNAMICS; PROTEINS; GLASS; ALPHA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Galantini, L Univ Roma La Sapienza, Dipartimento Chim, Piazzale Aldo Moro 5, I-00185 Rome, Italy Univ Roma La Sapienza Piazzale Aldo Moro 5 Rome Italy I-00185
Citazione:
E. Iannilli et al., "An integrated quasi-elastic light-scattering, pulse-gradient-spin-echo study on the transport properties of alpha,alpha-trehalose, sucrose, and maltose deuterium oxide solutions", J PHYS CH B, 105(48), 2001, pp. 12143-12149

Abstract

A study on D20 solutions of trehalose, maltose, and sucrose have been performed by using quasi-elastic light-scattering (QELS) and H-1 and H-2 pulse-gradient-spin-echo NMR (PGSE-NMR). The self-diffusion coefficient of disaccharide (D) and the apparent diffusion coefficient D-app have been obtained as a function of disaccharide weight fraction c and temperature (20-60 degreesC). Hydrodynamic radii at infinite dilution have been evaluated. In caseof trehalose and sucrose a model of monodisperse hard spheres has been used to interpret the concentration dependence of D and D-app in the dilute region (c less than or equal to 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 (D-s) at 20 degreesC has also been measured for the DO solutions of the three sugars. By following an interpretation commonly used to rationalize the self-diffusion coefficient of small molecules incolloidal systems, obstruction and hydration of disaccharide have been invoked to explain the decrease of D, as a function of c. The hydration numbers rank trehalose > maltose > sucrose has been observed in agreement with data reported in the literature.

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Documento generato il 01/10/20 alle ore 03:23:54