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Related Concept Videos

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...
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...
High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:

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Related Experiment Video

Updated: Jun 4, 2026

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization
10:41

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

Published on: April 5, 2019

Ionic liquid/ionic liquid dispersive liquid-liquid microextraction.

Ru-Song Zhao1, Xia Wang, Fu-Wei Li

  • 1Key Laboratory for Applied Technology of Sophisticated Analytical Instruments of Shandong Province, Analysis and Test Center, Shandong Academy of Sciences, Jinan, PR China. zhaors1976@126.com

Journal of Separation Science
|March 2, 2011
PubMed
Summary
This summary is machine-generated.

A new ionic liquid/ionic liquid dispersive liquid-liquid microextraction (IL/IL-DLLME) method offers a greener alternative for analyzing environmental pollutants. This technique efficiently extracts pesticides like permethrin and biphenthrin from water samples.

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Cellular Lipid Extraction for Targeted Stable Isotope Dilution Liquid Chromatography-Mass Spectrometry Analysis
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Cellular Lipid Extraction for Targeted Stable Isotope Dilution Liquid Chromatography-Mass Spectrometry Analysis

Published on: November 17, 2011

Area of Science:

  • Analytical Chemistry
  • Environmental Chemistry
  • Green Chemistry

Background:

  • Traditional methods for analyzing environmental pollutants often rely on hazardous organic solvents.
  • Pyrethroid pesticides, such as permethrin and biphenthrin, are widely used and pose environmental risks.
  • There is a need for efficient, rapid, and environmentally friendly analytical techniques.

Purpose of the Study:

  • To develop and validate a novel ionic liquid/ionic liquid dispersive liquid-liquid microextraction (IL/IL-DLLME) method.
  • To apply the developed method for the enrichment and analysis of pyrethroid pesticides in water samples.
  • To demonstrate the efficiency and applicability of ILs as alternatives to organic solvents in microextraction.

Main Methods:

  • Utilized a combination of hydrophobic and hydrophilic ionic liquids (ILs) as extraction and disperser solvents, respectively.
  • Employed dispersive liquid-liquid microextraction (DLLME) for rapid sample preparation.
  • Optimized key parameters affecting enrichment efficiency, including IL type and volume, and extraction time.

Main Results:

  • Achieved wide linear ranges for permethrin and biphenthrin from 1-100 μg/L.
  • Obtained low limits of detection (0.28 μg/L for permethrin, 0.83 μg/L for biphenthrin) and good precisions (4.65-7.78%).
  • Demonstrated high spiked recoveries (84.1-113.5%) when analyzing real-world water samples.

Conclusions:

  • The developed IL/IL-DLLME method is a simple, rapid, and effective technique for environmental pollutant analysis.
  • This approach offers a promising, greener alternative to conventional methods using hazardous organic solvents.
  • The IL/IL-DLLME technique shows significant potential for future applications in environmental monitoring.