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Thermodynamic Properties of the Solute Transfer from the Aqueous Acetonitrile Mobile Phase to the Stationary Phase Monitored by HPLC


초록

High-performance liquid chromatography is suitable for getting thermodynamic information about solute-solvent interactions. We used a squalane impregnated $C_{18}$ phase as a presumably bulk-like stationary phase to secure a simple partition mechanism for solute retention in reversed phase liquid chromatographic system. We measured retention data of some selected solutes (benzene, toluene, ethylbenzene, propylbenzene, butylbenzene, phenol, benzylalcohol, phenethylalcohol, benzylacetone, acetophenone, benzonitrile, benzylcyanide) at 25, 30, 35, 40, 45, and 50 $^{\circ}C$ in 30/70, 40/60, 50/50, 60/40 and 70/30 (v/v%) acetonitrile/water eluents. The van't Hoff plots were nicely linear, thus we calculated dependable thermodynamic values such as enthalpies and entropies of solute transfer from the mobile phase to the stationary phase based on more than four retention measurements on different days (or weeks). We found that the cavity formation effect was the major factor in solute distribution between the mobile and stationary phases in the system studied here. Our data were com-pared with some relevant literature data.

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피인용 문헌

  1. Positional effect of solute functional group among positional isomers in hydroxyl group–solvent and carbonyl group–solvent specific interactions in methanol–water mixed solvents m vol.910, pp.2, 2000, https://doi.org/10.1016/s0021-9673(00)01243-7
  2. The Hydroxyl Group-Solvent and Carbonyl Group-Solvent Specific Interactions for Some Selected Solutes Including Positional Isomers in Acetonitrile/Water Mixed Solvents Monitored by HPLC vol.23, pp.1, 2000, https://doi.org/10.5012/bkcs.2002.23.1.065
  3. Thermodynamic Study of Enantioseparation of Arylpropionic Acids with the Chirex 3001 Stationary Phase vol.27, pp.4, 2000, https://doi.org/10.1081/jlc-120028251
  4. The Positional Effect of Solute Functional Group among Positional Isomers of Phenylpropanol in Hydroxyl Group-Solvent Specific Interactions in Methanol/Water Mixed Solvents Monitored by HPLC vol.26, pp.8, 2000, https://doi.org/10.5012/bkcs.2005.26.8.1246