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Related Concept Videos

Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

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Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Biocompatible solid-phase microextraction coatings based on polyacrylonitrile and solid-phase extraction phases.

Mihaela L Musteata1, Florin Marcel Musteata, Janusz Pawliszyn

  • 1Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.

Analytical Chemistry
|August 10, 2007
PubMed
Summary

New biocompatible solid-phase microextraction (SPME) coatings enable fast analysis of biological fluids. These coatings are protein-adsorption-resistant, suitable for in vivo and in vitro drug testing and plasma protein binding assays.

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Area of Science:

  • Analytical Chemistry
  • Biomaterials Science
  • Pharmacokinetics

Background:

  • Solid-phase microextraction (SPME) applications are expanding into biological fluid analysis.
  • Developing biocompatible coatings is crucial for direct contact with biological matrices like blood and tissue.
  • Existing methods may face challenges with protein adsorption in biological samples.

Purpose of the Study:

  • To develop novel biocompatible SPME coatings for in vivo and in vitro extractions.
  • To confirm the biocompatibility and performance of these new coatings.
  • To enable fast and reliable analysis of drugs in biological samples.

Main Methods:

  • Fabrication of biocompatible SPME coatings.
  • X-ray photoelectron spectroscopy (XPS) for biocompatibility confirmation.
  • Development of an SPME/High-Performance Liquid Chromatography (HPLC) method.
  • Analysis of model drugs (verapamil, loperamide, diazepam, nordiazepam, warfarin) in buffer and human plasma.

Main Results:

  • The developed SPME coatings demonstrated excellent biocompatibility.
  • Coatings showed minimal protein adsorption, confirmed by XPS.
  • Successful application of SPME/HPLC for rapid drug quantification in plasma.
  • Accurate assay of drug plasma protein binding was achieved.

Conclusions:

  • The new biocompatible SPME coatings are suitable for direct use with biological matrices.
  • These coatings offer a promising tool for fast pharmacokinetic studies and therapeutic drug monitoring.
  • The developed method facilitates efficient analysis of drugs and their binding characteristics in biological fluids.