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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...
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...
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...

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Updated: Jun 5, 2026

A Polyaniline-based Sensor of Nucleic Acids
07:58

A Polyaniline-based Sensor of Nucleic Acids

Published on: November 1, 2016

Self-doped polyaniline as new polyaniline substitute for solid-phase microextraction.

Ali Mehdinia1, Fateme Roohi, Ali Jabbari

  • 1Department of Marine Living Resources, Iranian National Institute for Oceanography, Tehran, Iran. mehdinia@inco.ac.ir

Analytica Chimica Acta
|December 21, 2010
PubMed
Summary

This study introduces nano-structured self-doped polyaniline (SPAN) SPME fibers, showing superior thermal stability and extraction efficiency for 1,4-dioxane compared to traditional PANI fibers.

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Last Updated: Jun 5, 2026

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Solid-phase microextraction (SPME) is a widely used technique for sample preparation.
  • Polyaniline (PANI) has been explored as a coating material for SPME fibers.
  • Limitations of PANI include thermal stability issues at elevated temperatures.

Purpose of the Study:

  • To investigate the extraction efficiency and thermal stability of nano-structured self-doped polyaniline (SPAN) as a novel SPME fiber coating.
  • To evaluate SPAN-based fibers as a potential substitute for conventional PANI coatings.
  • To optimize the headspace SPME (HS-SPME) method for the determination of 1,4-dioxane using SPAN fibers.

Main Methods:

  • SPAN-based SPME fibers were fabricated via electrochemical deposition on platinum wires.
  • HS-SPME coupled with gas chromatography-flame ionization detection (GC-FID) was employed for 1,4-dioxane analysis.
  • Extraction parameters including time, temperature, salt concentration, stirring rate, and headspace volume were optimized.
  • Thermal stability was assessed up to 350 °C.

Main Results:

  • SPAN fibers exhibited excellent thermal stability, remaining effective at temperatures up to 350 °C.
  • The SPAN coating demonstrated high extraction capacity and a long lifespan (over 50 uses).
  • Optimized method showed linearity (R(2)>0.993) from 1-100 ng mL(-1) with a detection limit of 0.1 ng mL(-1).
  • Good repeatability (single fiber <6.0%, fiber-to-fiber <10.4%) and high recoveries (98-120%) in real water samples were achieved.

Conclusions:

  • Nano-structured self-doped polyaniline (SPAN) is a promising material for SPME fiber coatings due to its enhanced thermal stability and extraction performance.
  • SPAN-based SPME fibers offer a viable and potentially superior alternative to traditional PANI coatings for analyzing volatile organic compounds like 1,4-dioxane.
  • The developed HS-SPME-GC-FID method using SPAN fibers is sensitive, repeatable, and suitable for analyzing 1,4-dioxane in environmental water samples.