Gallina Maria Elena, Sassi Paola, Paolantoni Marco, Morresi Assunta, Cataliotti Rosario Sergio
Dipartimento di Chimica, Università di Perugia, Via Elce di Sott, 8, 06100 Perugia, Italy.
J Phys Chem B. 2006 May 4;110(17):8856-64. doi: 10.1021/jp056213y.
A vibrational analysis using FTIR and Raman spectroscopies was carried out on aqueous glucose solutions with a wide range of solute molar fractions and temperatures. The analysis was aimed at revealing structural changes in the local hydrogen-bonding (HB) network of liquid water, correlating these with the conservative properties of biomolecules, and comparing them with those of other sugars. The results of our measurements clearly show that the action of glucose is 2-fold; on one hand, there is a linkage with free hydroxyls of water; on the other, there is a slight lessening of the ordered (tetrahedral) H-bonded assembly of bulk H(2)O. These opposite effects do not balance each other, so the average HB interaction strength decreases on increasing glucose concentration. As a result, there is a reduction in the temperature dependence of solutions structure. In our opinion, this could be related to the low bioprotective action of this carbohydrate.
使用傅里叶变换红外光谱（FTIR）和拉曼光谱对具有广泛溶质摩尔分数和温度范围的葡萄糖水溶液进行了振动分析。该分析旨在揭示液态水局部氢键（HB）网络的结构变化，将这些变化与生物分子的保守性质相关联，并与其他糖类的变化进行比较。我们的测量结果清楚地表明，葡萄糖的作用具有双重性；一方面，它与水的游离羟基相连；另一方面，大量H₂O的有序（四面体）氢键组装略有减少。这些相反的效应并未相互抵消，因此随着葡萄糖浓度的增加，平均HB相互作用强度降低。结果，溶液结构的温度依赖性降低。我们认为，这可能与这种碳水化合物的低生物保护作用有关。
