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Fan J.-P.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Liao D.-D.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Zhen B.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Xu X.-K.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Zhang X.-H.,Nanchang University
Industrial and Engineering Chemistry Research | Year: 2015

The solubilities of genistin in the binary solvent mixtures ethanol + water and acetone + water with various initial mole fractions were measured by high-performance liquid chromatography (HPLC) at different temperatures ranging from 278.2 to 313.2 K. An interesting phenomenon was observed, namely, a synergistic effect of the binary solvent mixtures on solubility. In this synergistic effect, the solubility of genistin reached a maximum and was higher than its solubility in the separate solvents when the initial mole fraction of ethanol or acetone was 0.5 throughout the whole range of temperatures studied. The solubility of genistin in the mixtures increased with temperature. A simplified thermodynamic model, the modified Apelblat model, and the λh model were used to correlate the solubility data of genistin with temperature. Among the three models, the modified Apelblat model showed the best correlation in describing the dependence of the solubility on temperature. Furthermore, to illustrate the effects of both the temperature and the initial mass fraction of ethanol or acetone on the changes in the solubility of genistin, nonrandom two-liquid (NRTL), Sun, and Ma models were also used to correlate the data. The results showed that the solubilities calculated by the Sun model showed better agreement with the experimental data than those calculated by the other two models. © 2015 American Chemical Society. Source


Fan J.-P.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Fan J.-P.,Nanchang University | Xie C.-F.,Nanchang University | Luo Y.-S.,Nanchang University | And 5 more authors.
Journal of Chemical Thermodynamics | Year: 2013

The solubilities of betulin and betulinic acid were measured at varied values of mole fraction of sodium hydroxide aqueous solutions at a series of temperature (283.2, 293.2, 303.2, 313.2, and 323.2) K. They increase with the increase of temperature. Furthermore, the solubility of betulinic acid has a positive correlation with the mole fraction of sodium hydroxide aqueous solutions, and so is that of the betulin. The experimental solubility resuls are well correlated by the modified Apelblat equation. The enthalpy and entropy of betulin and betulinic acid during the dissolution process in sodium hydroxide aqueous solutions are calculated with the van't Hoff equation. The results indicate that the dissolution process is endothermal reaction that is driven by entropy. © 2013 Elsevier Ltd. All rights reserved. Source


Fan J.-P.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Fan J.-P.,Nanchang University | Xie Y.-L.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | Tian Z.-Y.,Key Laboratory of Poyang Lake Ecology and Bio Resource Utilization | And 5 more authors.
Journal of Chemical Thermodynamics | Year: 2013

The values of the solubility of evodiamine in chloroform, dichloromethane, acetone, ethyl acetate, 1-butanol, isopropanol, ethanol, methanol, ethyl ether, cyclohexane, n-pentane and n-hexane were measured at T = (283.2, 293.2, 303.2, 313.2, and 323.2) K. The solubility of evodiamine in all the organic solvents studied increases with the increase of the temperature. The experimental solubility values were correlated by a simplified thermodynamic equation and the modified Apelblat equation. The values of the dissolution enthalpy and entropy of evodiamine in all organic solvents were calculated using the van't Hoff equation. The findings showed that the dissolution process was endothermic and entropy-driven. These data of solubility can be used to guide the processes of extraction, purification in the industry. © 2012 Published by Elsevier B.V. All rights reserved. Source

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