1H and 23Na longitudinal and transverse relaxation times have been measured to examine the concentration dependence of the dynamic behaviour of pectin solutions and gels. T1 and T2 relaxation times were measured in HDE pectin solutions and gels prepared with different cosolutes. A lowering of T1 and T2 values was observed in relation to a better efficiency of the intermolecular forces between polymer molecules and/or the formation of more extended junction zones. The T1/T2 ratio was also exploited indicating that even bulk water experiences anisotropic motions due to the gel formation. A correspondence of NMR results with previous reported data of rheological measurements of pectin gels prepared with the same cosolutes was found.
1H and 23Na NMR relaxation times study of pectin solutions and gels / Brosio, Elvino; Delfini, Maurizio; DI NOLA, Alfredo; A., D'Ubaldo; C., Lintas. - In: CELLULAR AND MOLECULAR BIOLOGY. - ISSN 0145-5680. - STAMPA. - 39:6(1993), pp. 583-588.
1H and 23Na NMR relaxation times study of pectin solutions and gels.
BROSIO, Elvino;DELFINI, Maurizio;DI NOLA, Alfredo;
1993
Abstract
1H and 23Na longitudinal and transverse relaxation times have been measured to examine the concentration dependence of the dynamic behaviour of pectin solutions and gels. T1 and T2 relaxation times were measured in HDE pectin solutions and gels prepared with different cosolutes. A lowering of T1 and T2 values was observed in relation to a better efficiency of the intermolecular forces between polymer molecules and/or the formation of more extended junction zones. The T1/T2 ratio was also exploited indicating that even bulk water experiences anisotropic motions due to the gel formation. A correspondence of NMR results with previous reported data of rheological measurements of pectin gels prepared with the same cosolutes was found.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
