Determination and Temperature Dependence of n-Octanol/Water Partition Coefficients for Seven Sulfonamides from (298.15 to 333.15) K

  • Congliang, Zhang (College of Chemical Engineering, Zhengzhou University) ;
  • Yan, Wang (College of Chemical Engineering, Zhengzhou University) ;
  • Fuan, Wang (College of Chemical Engineering, Zhengzhou University)
  • Published : 2007.07.20


A shake-flask method was used to determine the n-octanol/water partition coefficients of sulfamethazine, sulfadimethoxine, sulfamethoxydiazine, sulfamonomethoxine, sulfamethoxazole, sulfaquinoxaline and sulfachloropyrazine from (298.15 to 333.15) K. The results showed that the n-octanol/water partition coefficient of each sulfonamide decreased with the increase of temperature. Based on the fluid phase equilibrium theory, the thermodynamic relationship of n-octanol/water partition coefficient depending on the temperature is proposed, and the changes of enthalpy, entropy, and the Gibbs free energy function for sulfonamides partitioning in n-octanol/ water are determined, respectively. Sulfonamides molecules partitioning in n-octanol/water is mainly an enthalpy driving process, during which the order degrees of system increased. The temperature effect coefficient of n-octanol/water partition coefficient is discussed. The results show that its magnitude is the same as that of values in the literature.


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