Analyzing ligand depletion in a saturation equilibrium binding experiment

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I present a proposal for a laboratory practice to generate and analyze data from a saturation equilibrium binding experiment addressed to advanced undergraduate students. [3H]Quinuclidinyl benzilate is a non-selective muscarinic ligand with very high affinity and very low nonspecific binding to brain membranes, which contain a high density of muscarinic receptors. These features allow the instructor to devote especial emphasis to evaluate ligand depletion, and therefore, stress the subtle but fundamental difference between total (added) ligand and free ligand concentration at equilibrium. © 2006 by The International Union of Biochemistry and Molecular Biology.
Original languageEnglish
Pages (from-to)428-431
JournalBiochemistry and Molecular Biology Education
Publication statusPublished - 1 Jan 2006


  • Binding
  • Equilibrium
  • Ligand depletion
  • Muscarinic
  • Quinuclidinyl benzilate


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