, Volume 49, Issue 5–6, pp 343–346 | Cite as

Capillary electrophoresis study of human serum albumin binding to basic drugs

  • Y. S. Ding
  • X. F. Zhu
  • B. C. Lin
Short Communications


The applicability of capillary electrophoresis/frontal analysis (CE/FA) for determining the binding constants of the drugs propranolol (PRO) and verapamil (VER) to human serum albumin (HSA) was investigated. After direct hydrodynamic injection of a drug-HAS mixture solution into a coated capillary (32 cm × 50 μm i.d.), the basic drug was eluted as a zonal peak with a plateau region under condition of phosphate buffer (pH 7.4; ionic strength 0.17) at 12 kV positive running voltage. The unbound drug concentrations measured from the plateau peak heights had good correlation coefficients,r>0.999. Employing the Scatchard plot, the Klotz plot and nonlinear regression, the drug protein binding parameters, the binding constant and the number of binding sites on one protein molecule, were obtained. The binding constant obtained was compared to a reported equilibrium dialysis result and they are basically in good agreement.

Key Words

Capillary electrophoresis Frontal analysis Binding constants Basic drugs Human serum albumin 


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Copyright information

© Friedr. Vieweg & Sohn Verlagsgesellschaft mbH 1999

Authors and Affiliations

  • Y. S. Ding
    • 1
  • X. F. Zhu
    • 1
  • B. C. Lin
    • 1
  1. 1.Dalian Institute of Chemical PhysicsThe Chinese Academy of SciencesDalianP.R. China

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