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Adjustable-capacity anion-exchange separator.

Andy Woodruff1, Christopher A Pohl, Andrei Bordunov

  • 1Dionex Corporation, Sunnyvale, CA 94085, USA. andy.woodruff@dionex.com

Journal of Chromatography. A
|July 11, 2002
PubMed
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A novel covalently bound cryptand anion exchanger offers adjustable capacity and selectivity via mobile phase selection, overcoming limitations of previous adsorbed systems for improved chromatography.

Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Materials Science

Background:

  • Previous cryptand-based anion exchangers utilized adsorbed cryptands, leading to stability and performance issues.
  • Adsorbed stationary phases present challenges in chromatographic applications due to leaching and inconsistent binding.

Purpose of the Study:

  • To develop a novel, covalently bound cryptand anion exchanger for enhanced chromatographic performance.
  • To demonstrate the adjustable capacity and selectivity of the new stationary phase through mobile phase manipulation.

Main Methods:

  • Synthesis of a novel styrene-based cryptand.
  • Covalent attachment of the cryptand to a solid support to create a stationary phase.
  • Chromatographic evaluation using different mobile phases to assess capacity and selectivity.

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Main Results:

  • The developed cryptand anion exchanger exhibits adjustable capacity and selectivity.
  • Covalent bonding eliminates the problems associated with adsorbed cryptand phases.
  • The prototype column demonstrates unique and advantageous chromatographic properties.

Conclusions:

  • Covalently bound cryptand anion exchangers represent a significant advancement over adsorbed systems.
  • Mobile phase optimization provides a simple method for tuning chromatographic performance.
  • This novel stationary phase offers a promising platform for advanced anion-exchange chromatography.