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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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Balanced extraction of volatile and semi-volatile compounds by dynamic linked position unity solid-phase

Yun-Jiao Ma1, Tao Zhou1, Wei Jiang1

  • 1National Engineering Research Center of Seafood, Collaborative Innovation Center of Provincial and Ministerial Co-construction for Seafood Deep Processing, School of Food Science and Technology, Dalian Polytechnic University, Dalian 116034, People's Republic of China.

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|December 12, 2022
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Summary

A new dynamic linked position unity (DLPU)-solid-phase microextraction (SPME) method balances extraction of volatile and semi-volatile compounds. This approach avoids extraction bias by simultaneously utilizing headspace and liquid extraction positions.

Keywords:
Dynamic linked position unitySemi-volatile compoundsSolid-phase microextractionVolatile compounds

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Area of Science:

  • Analytical Chemistry
  • Separation Science

Background:

  • Compound profiles in extracts are influenced by solid-phase microextraction (SPME) position (headspace or liquid).
  • A theoretical interpretation for this positional influence has been lacking.

Purpose of the Study:

  • To propose a theoretical framework and method for balanced extraction of volatile and semi-volatile compounds.
  • To introduce the dynamic linked position unity (DLPU)-SPME method.

Main Methods:

  • Development and application of the DLPU-SPME technique.
  • Theoretical calculations to determine key factors influencing extraction efficiency and position.
  • Investigation of pH, temperature, and salt effects on DLPU-SPME.

Main Results:

  • DLPU-SPME allows balanced extraction of both volatile and semi-volatile compounds.
  • Key factors affecting extraction efficiency were identified as pH, temperature, and salt.
  • Theoretical calculations revealed Kfs0Kfs as an indicator of SPME position and analyte-dependent factors regulating extraction bias.

Conclusions:

  • The DLPU-SPME method effectively overcomes extraction bias by integrating headspace and liquid extraction.
  • This method provides a theoretical basis for understanding and controlling SPME extraction positions.