Abstract
The extent of drug binding to plasma proteins, determined by measuring the free active fraction, has a significant effect on the pharmacokinetics and pharmacodynamics of a drug. It is therefore highly important to estimate drug-binding ability to these macromolecules in the early stages of drug discovery and in clinical practice. Traditionally, equilibrium dialysis is used, and is presented as the reference method, but it suffers from many drawbacks. In an attempt to circumvent these, a vast array of different methods has been developed. This review focuses on the most important approaches used to characterize drug–protein binding. A description of the principle of each method with its inherent strengths and weaknesses is outlined. The binding affinity ranges, information accessibility, material consumption, and throughput are compared for each method. Finally, a discussion is included to help users choose the most suitable approach from among the wealth of methods presented.
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Abbreviations
- ACE:
-
Affinity capillary electrophoresis (mobility shift assay)
- AGP:
-
α1-Acid glycoprotein
- BGE:
-
Background electrolyte
- BSA:
-
Bovine serum albumin
- CD:
-
Circular dichroism
- CE:
-
Capillary electrophoresis
- CE/FA:
-
Capillary electrophoresis/frontal analysis
- CZE:
-
Capillary zone electrophoresis
- D:
-
Drug
- DP:
-
Drug–protein complex
- DSC:
-
Differential scanning calorimetry
- ED:
-
Equilibrium dialysis
- FA:
-
Frontal analysis
- FACCE:
-
Continuous capillary electrophoresis frontal analysis
- HD:
-
Hummel–Dreyer method
- HDL:
-
High-density lipoproteins
- HPAC:
-
High-performance affinity chromatography
- HSA:
-
Human serum albumin
- IR:
-
Infrared
- ISRP:
-
Internal-surface reversed phase
- ITC:
-
Isothermal titration calorimetry
- K a :
-
Association constant
- K d :
-
Dissociation constant
- k off :
-
Dissociation rate constant
- k on :
-
Association rate constant
- LC:
-
Liquid chromatography
- LDL:
-
Low-density lipoproteins
- LIF:
-
Laser-induced fluorescence
- m :
-
Total number of different classes of binding sites
- MS:
-
Mass spectrometry
- n :
-
Number of binding sites with the same affinity per protein molecule
- NMR:
-
Nuclear magnetic resonance
- NSB:
-
Nonspecific binding
- ORD:
-
Optical rotatory dispersion
- P:
-
Protein
- PAMPA:
-
Parallel artificial membrane assay
- r :
-
Number of total drugs bound per protein
- SEC:
-
Size-exclusion chromatography
- SPR:
-
Surface plasmon resonance
- UC:
-
Ultracentrifugation
- UF:
-
Ultrafiltration
- VACE:
-
Vacancy affinity capillary electrophoresis
- VP:
-
Vacancy peak method
- ZE:
-
Zonal elution
- ΔCp:
-
Heat capacity change
- ΔG :
-
Gibbs free energy
- ΔH :
-
Enthalpy of the binding reaction
- ΔS :
-
Entropy change
- μ :
-
Electrophoretic mobility
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Vuignier, K., Schappler, J., Veuthey, JL. et al. Drug–protein binding: a critical review of analytical tools. Anal Bioanal Chem 398, 53–66 (2010). https://doi.org/10.1007/s00216-010-3737-1
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DOI: https://doi.org/10.1007/s00216-010-3737-1