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Extraction: Advanced Methods00:56

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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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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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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Sampling materials are classified into three main types: solid, liquid, and gas.
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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.
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Evolution and current advances in sorbent-based microextraction configurations.

María J Trujillo-Rodríguez1, Idaira Pacheco-Fernández2, Iván Taima-Mancera3

  • 1Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Consejo Superior de Investigaciones Científicas (CSIC)-Universidad de Zaragoza, 50009 Zaragoza, Spain.

Journal of Chromatography. A
|November 16, 2020
PubMed
Summary
This summary is machine-generated.

This review covers advancements in analytical sample preparation using solid sorbents for microextraction. It classifies methods like micro-solid-phase extraction (µ-SPE) and solid-phase microextraction (SPME) for efficient analyte extraction.

Keywords:
micro-solid-phase extractionsample preparationsolid-phase microextractionstir bar sorptive extractionthin film solid-phase microextraction

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Sample preparation is crucial for accurate analytical results.
  • Miniaturized and micro-scale techniques offer advantages in solvent reduction and efficiency.
  • Solid sorbents are versatile materials for analyte extraction.

Purpose of the Study:

  • To review recent developments in sorbent-based microextraction techniques.
  • To classify and describe various microextraction methods utilizing solid sorbents.
  • To highlight the operational modes and sub-modes of prominent techniques.

Main Methods:

  • Classification of microextraction techniques based on operational mode.
  • Detailed description of micro-solid-phase extraction (µ-SPE) and solid-phase microextraction (SPME) sub-modes.
  • Consideration of other sorbent-based microscale approaches like SBSE and TFME.

Main Results:

  • Two primary categories of sorbent-based microextraction identified: µ-SPE and SPME.
  • Various sub-modes within µ-SPE (static, dispersive) and SPME (fiber, in-tube) are detailed.
  • A range of other sorbent-based microscale techniques are also discussed.

Conclusions:

  • Solid sorbents are key in modern miniaturized analytical sample preparation.
  • Microextraction techniques, particularly µ-SPE and SPME, offer efficient and scalable solutions.
  • The reviewed methods represent significant advancements in analytical chemistry.