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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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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.
A...
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Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

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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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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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Titration in Nonaqueous Solvents01:16

Titration in Nonaqueous Solvents

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Most acid-base titrations are performed in an aqueous medium. In aqueous titrations, water competes with weaker acids or bases for proton donation or acceptance, leading to ambiguous endpoints in the titration curve. Water also affects the partial ionization of weak acids or bases. For example, water accepts a proton from acetic acid to form hydronium and acetate ions. The hydronium ion formed is a stronger acid than acetic acid, and the acetate ion is a stronger base than water. As a result,...
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Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

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Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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Ionic Liquids and Deep Eutectic Solvents for Polyphenol Extraction: Opportunities and Limitations.

Gonçalo P Rosa1,2, Maria Carmo Barreto1, Ana M L Seca1,2

  • 1University of the Azores, Faculty of Sciences and Technology, Centre for Ecology, Evolution and Environmental Changes (cE3c), Azorean Biodiversity Group & Global Change and Sustainability Institute (CHANGE), 9500-321 Ponta Delgada, Portugal.

International Journal of Molecular Sciences
|May 4, 2026
PubMed
Summary

Ionic liquids (ILs) and deep eutectic solvents (DESs) offer greener alternatives for extracting plant polyphenols. While ILs show high yields, DESs are more cost-effective and industrially viable, though both face purification challenges.

Keywords:
deep eutectic solventsflavonoidsionic liquidspolyphenolssustainabilitytannins

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Area of Science:

  • Green chemistry
  • Biomass processing
  • Natural product extraction

Background:

  • Polyphenols are vital plant compounds with diverse applications.
  • Conventional organic solvent extraction is inefficient and environmentally harmful.
  • Ionic liquids (ILs) and deep eutectic solvents (DESs) are emerging as sustainable alternatives.

Purpose of the Study:

  • To review recent advancements in ILs and DESs for polyphenol extraction.
  • To evaluate solvent design, extraction efficiency, and process sustainability.
  • To identify challenges and future directions for these novel solvent systems.

Main Methods:

  • Literature review of studies on ILs and DESs for polyphenol extraction.
  • Analysis of extraction yields, selectivity, and process intensification techniques.
  • Evaluation of downstream processing challenges, including purification and solvent recovery.

Main Results:

  • Imidazolium-based ILs, especially with ultrasound/microwave assistance, offer high yields but face cost and toxicity issues.
  • DESs, particularly choline chloride and lactic acid-based, are cost-effective and scalable.
  • Both ILs and DESs present challenges in extract purification and solvent recovery due to low volatility.

Conclusions:

  • ILs and DESs are promising replacements for conventional solvents in polyphenol extraction.
  • DESs show greater industrial feasibility due to lower cost and easier preparation.
  • Future research should focus on integrated extraction-recovery systems and scalable, sustainable processes.