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Size-Exclusion Chromatography01:08

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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...
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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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Automated dispersive solid-phase extraction using dissolvable Fe3O4-layered double hydroxide core-shell microspheres

Sheng Tang1, Guo Hui Chia, Yuepeng Chang

  • 1Department of Chemistry, National University of Singapore , 3 Science Drive 3, Singapore 117543, Singapore.

Analytical Chemistry
|October 17, 2014
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Summary

This study introduces automated dispersive solid-phase extraction (d-SPE) using dissolvable magnetic microspheres, eliminating manual steps for efficient pharmaceutical and personal care product analysis. The method enables streamlined, automated extraction and HPLC analysis.

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Area of Science:

  • Analytical Chemistry
  • Environmental Chemistry
  • Materials Science

Background:

  • Automation of dispersive solid-phase extraction (d-SPE) is challenging due to manual separation steps like centrifugation.
  • Conventional SPE requires a separate analyte elution step, adding complexity to the process.

Purpose of the Study:

  • To develop an automated d-SPE method using dissolvable magnetic microspheres for integrated extraction and analysis.
  • To enable automated separation and analysis of pharmaceuticals and personal care products (PPCPs) in aqueous samples.

Main Methods:

  • Utilized Fe3O4-layered double hydroxide core-shell microspheres as a dissolvable magnetic sorbent for d-SPE.
  • Integrated the automated d-SPE with high-performance liquid chromatography (HPLC) and photodiode array detection.
  • Optimized experimental parameters including agitation speed, temperature, time, and pH for the d-SPE process.

Main Results:

  • Achieved low limits of detection for PPCPs (0.021–0.042 μg/L) and good linearity (r(2) ≥ 0.9956).
  • Demonstrated excellent repeatability for extractions with relative standard deviations ≤4.1%.
  • Successfully applied the method to analyze PPCPs in sewage samples and specific drugs.

Conclusions:

  • The developed automated d-SPE method using dissolvable magnetic microspheres is efficient for the extraction and analysis of target PPCPs.
  • This approach simplifies the SPE process by eliminating the need for a separate analyte elution step.
  • The automated extraction-HPLC system offers a robust and efficient solution for analyzing contaminants in complex matrices.