Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (11): 1315-1318.doi: 10.3866/PKU.WHXB20051125

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Volumetric Properties of L-Serine in n-propanol-Water Mixed Solvents at 298.15 K

XU Li; WANG Xu; LIN Rui-sen   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027
  • Received:2005-04-20 Revised:2005-06-07 Published:2005-11-15
  • Contact: LIN Rui-sen

Abstract: Densities of L-serine-n-propanol-water ternary solutions have been measured at 298.15 K by an oscillating-tube densimeter. Apparent molar volumes, limiting partial molar volumes, transfer partial molar volumes and hydration numbers for L-serine have been calculated. The transfer volumes from water to n-propanol-water mixtures and hydration numbers have been discussed in terms of the structural hydration interaction model. The results show that a dominant interaction between —OH group of n-propanol and the zwitterionic group of serine gives positive contribution to the transfer volume. The transfer volumes of serine from water to n-propanol-water mixed solvents are positive, and increase with increasing n-propanol concentration, while the hydration numbers decrease with increasing n-propanol concentration.

Key words: L-serine, n-propanol, Limiting partial molar volumes, Structural interactions