丝氨酸在葡萄糖-水和蔗糖-水混合溶剂中的体积性质

利用精密数字密度计测定了丝氨酸与不同组成的葡萄糖-水、蔗糖-水混合溶剂构成的三元系溶液的密度，计算了丝氨酸的表观摩尔体积、极限偏摩尔体积和理论水化数.根据结构水合作用模型讨论了迁移偏摩尔体积的变化规律，并与乙二醇-水和丙三醇-水等多羟基体系作了比较.结果表明，丝氨酸分子在多羟基化合物-水体系中增体积效应的大小与多羟基化合物所含OH基数目的多少有关.

Volumetric Properties of Serine in Glucose-water and Sucrose-water Mixed Solvents at 298.15 K

Densities of serine in glucose water and sucrose water mixed solvents have been measured at 298.15 K by an oscillating tube densimeter. Apparent molar volumes, limiting partial molar volumes and number of hydration of serine have been calculated. The transfer volumes from water to sugar water mixtures have been obtained and discussed in terms of the structural hydration interaction model. The results obtained have been compared with that in glycerol water and ethylene glycol water mixtures. It is concluded that the magnitude of enhancement effect on volume is related to the number of OH groups.