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Journal of Pharmacokinetics and Biopharmaceutics

, Volume 11, Issue 5, pp 483–498 | Cite as

Influence of volume shifts on drug binding during equilibrium dialysis: Correction and attenuation

  • John J. Lima
  • Janis J. MacKichan
  • Nicholas Libertin
  • Joseph Sabino
Article

Abstract

A time-dependent volume shift from buffer to plasma, which occurs during equilibrium dialysis, decreased the protein binding of disopyramide and its capacity constant, and had no effect on the binding association constant. The volume-dependent decrease in disopyramidine binding may be corrected for by use of a derived equation. Inclusion of dextran, 2.5% (w/v), and use of a thick, low molecular weight cutoff membrane was the most effective technique in attenuating the volume shift. The plasma (serum) protein binding of the basic drugs lidocaine, disopyramide,propranolol, and diazepam was decreased when protein was diluted to 88 % or less of its undiluted concentration as a consequence of the volume shift. The protein binding of clofibrate, a highly bound acid drug, was more sensitive to volume shifts than the four basic drugs. Correction of drug binding for volume shifts was reasonably successful for most drugs. The highest binding measured for all drugs was associated with the lowest volume shift.

Key words

volume-shift protein binding dextran disopyramide lidocaine propranolol diazepam clofibrate 

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Copyright information

© Plenum Publishing Corporation 1983

Authors and Affiliations

  • John J. Lima
    • 1
    • 2
  • Janis J. MacKichan
    • 1
  • Nicholas Libertin
    • 1
  • Joseph Sabino
    • 1
  1. 1.Division of Pharmacy Practice, College of PharmacyThe Ohio State UniversityColumbus
  2. 2.Division of Cardiology, College of MedicineThe Ohio State UniversityColumbus

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