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Related Concept Videos

Potentiometry: Membrane Electrodes01:15

Potentiometry: Membrane Electrodes

Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...

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Using a GFP-tagged TMEM184A Construct for Confirmation of Heparin Receptor Identity
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Polyion-sensitive membrane-based electrodes for heparin-binding foldamer analysis.

Caitlin Kelly1, Sobia Khaja, April Vena

  • 1Department of Chemistry, Kalamazoo College, Kalamazoo, MI 49008, USA.

Analytica Chimica Acta
|November 2, 2010
PubMed
Summary
This summary is machine-generated.

New polymer electrodes measure low molecular weight heparin (LMWH) binding to foldamer inhibitors. Binding strength varies with foldamer structure and LMWH preparation, with whole blood measurements depending on foldamer properties.

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Area of Science:

  • Biomaterials Science
  • Analytical Chemistry
  • Pharmacology

Background:

  • Low molecular weight heparin (LMWH) is an anticoagulant with variable preparations.
  • Heparin-binding foldamers are emerging as potential LMWH inhibitors.
  • Accurate measurement of LMWH-foldamer interactions is crucial for drug development.

Purpose of the Study:

  • To develop and validate polymer membrane-based electrodes for quantifying LMWH-foldamer binding.
  • To investigate how foldamer structure and LMWH preparation influence binding affinity.
  • To assess the feasibility of measuring foldamers directly in whole blood.

Main Methods:

  • Utilized polymer membrane-based electrodes sensitive to LMWH.
  • Analyzed titration curves of foldamers with LMWHs to determine equilibrium binding constants (Keq).
  • Developed electrodes with dinonylnaphthalene sulfonate for direct measurement in whole blood.

Main Results:

  • Foldamer structure significantly impacts the equilibrium binding constant (Keq).
  • The specific LMWH preparation influences the binding strength.
  • Whole blood electrode response correlates with foldamer lipophilicity and charge density.

Conclusions:

  • Polymer membrane electrodes provide a viable method for studying LMWH-foldamer interactions.
  • Foldamer design and LMWH characteristics are key determinants of binding efficacy.
  • Direct measurement of foldamers in whole blood is achievable, dependent on their physicochemical properties.