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Related Experiment Videos

Temperature effects in hydrophobic interaction chromatography

D Haidacher1, A Vailaya, C Horváth

  • 1Biotechnology Department, Sandoz Pharma, Basel, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|March 19, 1996
PubMed
Summary

Temperature significantly impacts amino acid retention in hydrophobic interaction chromatography (HIC). Thermodynamic parameters like enthalpy and entropy change with temperature, offering insights into hydrophobic effects.

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Area of Science:

  • Analytical Chemistry
  • Chromatography
  • Biochemistry

Background:

  • Hydrophobic interaction chromatography (HIC) is crucial for separating biomolecules.
  • Understanding the thermodynamic basis of HIC retention is essential for method development.

Purpose of the Study:

  • To investigate the effect of temperature on the retention of dansyl derivatives of amino acids in HIC.
  • To evaluate thermodynamic parameters (enthalpy, entropy, heat capacity) governing HIC retention.

Main Methods:

  • High-performance liquid chromatography (HPLC) was employed.
  • Dansyl derivatives of amino acids were analyzed across a temperature range (5-50°C) on three stationary phases.
  • Data were fitted to logarithmic and quadratic equations based on thermodynamic principles.

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Main Results:

  • Retention factor plots showed non-linear relationships with reciprocal temperature, indicating significant heat capacity changes.
  • Heat capacity change increased with temperature within the experimental range.
  • Enthalpy and entropy changes transitioned from positive at low temperatures to negative at high temperatures, consistent with hydrophobic effects.

Conclusions:

  • Chromatographic measurements provide a viable alternative to calorimetry for evaluating thermodynamic parameters in HIC.
  • Temperature-dependent thermodynamic analysis offers deeper insights into the hydrophobic effect in chromatographic separations.