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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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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...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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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,...
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Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

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The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
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High-Performance Liquid Chromatography: Elution Process01:05

High-Performance Liquid Chromatography: Elution Process

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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...
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Optimizing Chromatographic Separations01:15

Optimizing Chromatographic Separations

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Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Updated: Oct 29, 2025

Preparation of Binary and Ternary Deep Eutectic Systems
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[Progress in the application of deep eutectic solvents to extraction and separation technology].

Zexin Zhao1, Yinghe Ji1, Xiaomei Liu1

  • 1School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China.

Se Pu = Chinese Journal of Chromatography
|July 6, 2021
PubMed
Summary

Deep eutectic solvents (DESs) offer a green, non-toxic alternative to traditional solvents for extraction and separation. Their application in dispersive liquid-liquid microextraction (DLLME) and solid-phase extraction (SPE) enhances efficiency and environmental friendliness.

Keywords:
deep eutectic solvent (DES)dispersion liquid-liquid microextraction (DLLME)sample preparationsolid phase extraction (SPE)

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Area of Science:

  • Green Chemistry
  • Analytical Chemistry
  • Materials Science

Context:

  • Deep eutectic solvents (DESs), formed from hydrogen bond acceptors (HBAs) and donors (HBDs), are emerging as sustainable alternatives to traditional solvents.
  • DESs share properties with ionic liquids (ILs) but offer advantages like non-toxicity, biodegradability, and lower cost.
  • Their unique characteristics make them highly suitable for various extraction and separation applications in analytical chemistry.

Purpose:

  • To review the preparation, properties, and classification of DESs.
  • To summarize the advancements in DES applications for extraction and separation technologies, specifically in dispersive liquid-liquid microextraction (DLLME) and solid-phase extraction (SPE).
  • To highlight the potential of DESs in promoting green chemistry principles within sample preparation.

Summary:

  • DESs are versatile solvents demonstrating significant potential in extraction and separation processes, particularly in DLLME and SPE.
  • Their use as extraction solvents and dispersants in DLLME improves efficiency and reduces reliance on hazardous organic solvents.
  • In SPE, DESs function as effective eluents and can be integrated with magnetic nanocomposites for enhanced analyte adsorption and extraction.

Impact:

  • The integration of DESs into DLLME and SPE significantly advances sample preparation techniques, offering greener and more efficient alternatives.
  • DESs, especially when combined with magnetic materials, show promise for developing novel extraction methods and materials for analytical applications.
  • Further research into the fundamental mechanisms and properties of DESs is crucial for unlocking their full potential in extraction and separation science.