Retention Characteristics and Sorption Enthalpies of Esters of Natural Hydroxycarboxylic Acids on DB-1 Stationary Phase

Portnova, S. V.; Yamshchikova, Yulia F.; Krasnykh, E. L.

doi:10.1134/s0036024419020213

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…It is evident from Figure that for n -alkanes, at temperature 298.15 K, the contribution of Δ sln H ° based on Model A amounts to about 25% of Δ vap H °, while the contribution Δ sln H ° resulting from Model B and Model C reach only about 9% and 5%, respectively. The contribution of Δ sln H ° is somewhat higher for n -nitriles and still higher for 1-alkanols; in neither case is the Δ sln H ° negligible, as assumed by some authors. ,, Figure supports the previous studies on, for example, solution enthalpies of n -alkanes and cyclo-alkanes in cyclohexane − stating that Δ sln H ° can contribute by about 30–40% to Δ solv H °.…”

Section: Resultssupporting

confidence: 82%

“…The contribution of Δ sln H°is somewhat higher for n-nitriles and still higher for 1-alkanols; in neither case is the Δ sln H°n egligible, as assumed by some authors. 35,57,58 Figure 11 supports the previous studies on, for example, solution enthalpies of n-alkanes and cyclo-alkanes in cyclohexane 59−61 stating that Δ sln H°can contribute by about 30−40% to Δ solv H°.…”

Section: Resultssupporting

confidence: 79%

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Regression against Temperature of Gas–Liquid Chromatography Retention Factors. Van’t Hoff Analysis

et al. 2020

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The present work deals with the precise experimental determination of the gas–liquid chromatography (GLC) retention factors (k) in a sufficiently large temperature range to allow the calculation of the thermodynamic quantities associated with the sorption process. Once isothermal retention factors of three homologous series members of the type H-(CH2) n -Y (Y = CH3, OH, CN) were measured over a temperature range of about 110 K on a low-polar PDMS (HP-1) capillary column and checked for accuracy and precision by “arc plot” representation, the data were analyzed by applying different forms of the van’t Hoff relationship. We compared the linear versus nonlinear van’t Hoff plots representing situations characterized by Δsolv C p ° = 0, Δsolv C p °≠ 0 = constant, and Δsolv C p ° = f(T), respectively (Δsolv C p ° represents the difference in isobaric heat capacity associated with movement of the analyte between the mobile and the stationary phase). The “logarithmic” and “quadratic” nonlinear van ‘t Hoff equations were shown to be more appropriate than the linear van‘t Hoff equation for determining enthalpy and entropy of solvation. Special attention was devoted to the fitting performance and extrapolation capability of models with nonzero Δsolv C p °. By several metrics, the quadratic model exhibits better behavior in extrapolations yielding reasonable accuracy for retention time and/or enthalpy of solvation predictions at temperatures located below the experimental range.

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Section: Resultssupporting

confidence: 82%

Section: Resultssupporting

confidence: 79%

Regression against Temperature of Gas–Liquid Chromatography Retention Factors. Van’t Hoff Analysis

et al. 2020

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“…Liquid esters were purified using fractional distillation at reduced pressure (10 to 15 Torr) and dried over Na 2 SO 3 . Methods of synthesis and isolation are described in detail in previous works. − …”

Section: Methodsmentioning

confidence: 99%

Density and Viscosity of Glycolic, Lactic, and Malic Acid Esters

et al. 2022

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Densities and viscosities were measured as a function of temperature for 12 esters of glycolic, dl-lactic, and dl-malic acids and linear chain alcohols C1–C5. The density and kinematic viscosity were obtained using a pycnometer and a Pinkevitch capillary viscometer in a temperature range of 293.15–363.15 K with accuracies of 0.1 and 0.35%, respectively. The obtained data were used for dynamic viscosity calculation. It was demonstrated that the viscosity–temperature dependence of esters was described by the ASTM D341 model with an average absolute relative deviation of 1%. The temperature dependence of dynamic viscosity was fitted using the Arrhenius-like equation and Vogel–Fulcher–Tammann (VFT) model. It was found that the adjustable parameters A and B have the similar value for compounds in one homologous series. These parameters were taken as constant for each series of esters of the corresponding acids. The dynamic viscosity–temperature dependence of esters was better described by the VFT model than the Arrhenius-like equation. The capabilities of some group-additivity methods for predicting density have been reviewed and compared with experimental results.

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Retention characteristics, saturated vapor pressure and vaporization enthalpy of mesityl oxide ethers of linear alcohols C1–C5

Katunina,

Sarkisova,

Portnova

et al. 2024

Journal of Molecular Liquids

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Retention Characteristics and Sorption Enthalpies of Esters of Natural Hydroxycarboxylic Acids on DB-1 Stationary Phase

Cited by 7 publications

References 17 publications

Regression against Temperature of Gas–Liquid Chromatography Retention Factors. Van’t Hoff Analysis

Regression against Temperature of Gas–Liquid Chromatography Retention Factors. Van’t Hoff Analysis

Density and Viscosity of Glycolic, Lactic, and Malic Acid Esters

Retention characteristics, saturated vapor pressure and vaporization enthalpy of mesityl oxide ethers of linear alcohols C1–C5

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