Effect of mobile phase composition on the binding kinetics of chiral solutes on a protein-based high-performance liquid chromatography column: Interactions of D- and L-tryptophan with immobilized human serum albumin

Ju Yang, David S. Hage

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85 Citations (Scopus)

Abstract

This work examined the kinetic interactions of chiral solutes on immobilized protein columns, using the binding of D- and L-tryptophan to human serum albumin as a model. Based on band-broadening studies and previous measurements of the association equilibrium constants (K,) for this system, estimates were obtained for the dissociation and association rate constants (k(d) and k(a))- for D- and L-tryptophan under a variety of operating conditions. The relative importance of k(a) versus k(d ) in creating changes in the overall binding affinity was then considered. For example, an increase in temperature from 4 to 45°C gave a large change in k(a) for L-tryptophan that was due both to an increase in k(d) and to a decrease in k(a), while k(a) and k(d) for D-tryptophan showed a parallel increase that led to a much smaller temperature dependence for K(a). Similar comparisons between k(a) k(d) and K(a) were performed over a range of pH values, ionic strengths and solvent polarities. It was also possible from these studies to examine the changes in enthalpy and entropy that accompanied the formation of the activated complex between human serum albumin and each solute. The results from this work were then used to illustrate the importance of kinetics and band-broadening in protein-based chiral separations, and an example was provided showing how this type of kinetic data might be used to help optimize such separations.

Original languageEnglish (US)
Pages (from-to)15-25
Number of pages11
JournalJournal of Chromatography A
Volume766
Issue number1-2
DOIs
StatePublished - Apr 4 1997

Fingerprint

High performance liquid chromatography
Phase composition
Serum Albumin
Tryptophan
High Pressure Liquid Chromatography
Kinetics
Proteins
Association reactions
Immobilized Proteins
Temperature
Equilibrium constants
Entropy
Ionic strength
Osmolar Concentration
Enthalpy
Rate constants

Keywords

  • Albumin
  • Enantiomer separation
  • Immobilized proteins
  • Kinetic studies
  • Mobile phase composition
  • Thermodynamic parameters
  • Tryptophan

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

Cite this

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title = "Effect of mobile phase composition on the binding kinetics of chiral solutes on a protein-based high-performance liquid chromatography column: Interactions of D- and L-tryptophan with immobilized human serum albumin",
abstract = "This work examined the kinetic interactions of chiral solutes on immobilized protein columns, using the binding of D- and L-tryptophan to human serum albumin as a model. Based on band-broadening studies and previous measurements of the association equilibrium constants (K,) for this system, estimates were obtained for the dissociation and association rate constants (k(d) and k(a))- for D- and L-tryptophan under a variety of operating conditions. The relative importance of k(a) versus k(d ) in creating changes in the overall binding affinity was then considered. For example, an increase in temperature from 4 to 45°C gave a large change in k(a) for L-tryptophan that was due both to an increase in k(d) and to a decrease in k(a), while k(a) and k(d) for D-tryptophan showed a parallel increase that led to a much smaller temperature dependence for K(a). Similar comparisons between k(a) k(d) and K(a) were performed over a range of pH values, ionic strengths and solvent polarities. It was also possible from these studies to examine the changes in enthalpy and entropy that accompanied the formation of the activated complex between human serum albumin and each solute. The results from this work were then used to illustrate the importance of kinetics and band-broadening in protein-based chiral separations, and an example was provided showing how this type of kinetic data might be used to help optimize such separations.",
keywords = "Albumin, Enantiomer separation, Immobilized proteins, Kinetic studies, Mobile phase composition, Thermodynamic parameters, Tryptophan",
author = "Ju Yang and Hage, {David S.}",
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T1 - Effect of mobile phase composition on the binding kinetics of chiral solutes on a protein-based high-performance liquid chromatography column

T2 - Interactions of D- and L-tryptophan with immobilized human serum albumin

AU - Yang, Ju

AU - Hage, David S.

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N2 - This work examined the kinetic interactions of chiral solutes on immobilized protein columns, using the binding of D- and L-tryptophan to human serum albumin as a model. Based on band-broadening studies and previous measurements of the association equilibrium constants (K,) for this system, estimates were obtained for the dissociation and association rate constants (k(d) and k(a))- for D- and L-tryptophan under a variety of operating conditions. The relative importance of k(a) versus k(d ) in creating changes in the overall binding affinity was then considered. For example, an increase in temperature from 4 to 45°C gave a large change in k(a) for L-tryptophan that was due both to an increase in k(d) and to a decrease in k(a), while k(a) and k(d) for D-tryptophan showed a parallel increase that led to a much smaller temperature dependence for K(a). Similar comparisons between k(a) k(d) and K(a) were performed over a range of pH values, ionic strengths and solvent polarities. It was also possible from these studies to examine the changes in enthalpy and entropy that accompanied the formation of the activated complex between human serum albumin and each solute. The results from this work were then used to illustrate the importance of kinetics and band-broadening in protein-based chiral separations, and an example was provided showing how this type of kinetic data might be used to help optimize such separations.

AB - This work examined the kinetic interactions of chiral solutes on immobilized protein columns, using the binding of D- and L-tryptophan to human serum albumin as a model. Based on band-broadening studies and previous measurements of the association equilibrium constants (K,) for this system, estimates were obtained for the dissociation and association rate constants (k(d) and k(a))- for D- and L-tryptophan under a variety of operating conditions. The relative importance of k(a) versus k(d ) in creating changes in the overall binding affinity was then considered. For example, an increase in temperature from 4 to 45°C gave a large change in k(a) for L-tryptophan that was due both to an increase in k(d) and to a decrease in k(a), while k(a) and k(d) for D-tryptophan showed a parallel increase that led to a much smaller temperature dependence for K(a). Similar comparisons between k(a) k(d) and K(a) were performed over a range of pH values, ionic strengths and solvent polarities. It was also possible from these studies to examine the changes in enthalpy and entropy that accompanied the formation of the activated complex between human serum albumin and each solute. The results from this work were then used to illustrate the importance of kinetics and band-broadening in protein-based chiral separations, and an example was provided showing how this type of kinetic data might be used to help optimize such separations.

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