Brosio E, Delfini M, Di Nola A, D'Ubaldo A, Lintas C
Department of Chemistry, University of Rome La Sapienza, Italy.
Cell Mol Biol (Noisy-le-grand). 1993 Sep;39(6):583-8.
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.
已测量了1H和23Na的纵向和横向弛豫时间，以研究果胶溶液和凝胶动力学行为的浓度依赖性。在由不同共溶质制备的HDE果胶溶液和凝胶中测量了T1和T2弛豫时间。观察到T1和T2值降低，这与聚合物分子间分子力效率提高和/或形成更伸展的连接区有关。还利用了T1/T2比值，表明由于凝胶形成，即使是大量水也经历各向异性运动。发现NMR结果与先前报道的用相同共溶质制备的果胶凝胶流变学测量数据一致。
