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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

564
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...
564

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Updated: Oct 6, 2025

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Alternative Extraction and Downstream Purification Processes for Anthocyanins.

Ana N Nunes1,2, Alexandra Borges3, Ana A Matias1

  • 1iBET, Instituto de Biologia Experimental e Tecnológica, 2780-901 Oeiras, Portugal.

Molecules (Basel, Switzerland)
|January 21, 2022
PubMed
Summary
This summary is machine-generated.

This review explores advanced extraction and purification methods for anthocyanins, natural pigments with health benefits. It highlights compressed fluid and deep eutectic solvent techniques as efficient alternatives to conventional methods.

Keywords:
alternative solventsanthocyaninscounter-current chromatographydownstream processes

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Area of Science:

  • Natural Product Chemistry
  • Green Extraction Technologies

Background:

  • Anthocyanins are valuable natural pigments with diverse health benefits, widely used in food, nutraceuticals, and cosmetics.
  • Conventional extraction methods for anthocyanins are often inefficient, time-consuming, use organic solvents, and yield complex mixtures.
  • The increasing demand for anthocyanins necessitates innovative, safe, and cost-effective extraction and purification strategies.

Purpose of the Study:

  • To review and highlight advanced extraction techniques for anthocyanins, focusing on compressed fluid-based and deep eutectic solvent methods.
  • To provide an updated overview of counter-current chromatography for efficient anthocyanin purification.
  • To address the challenges associated with conventional anthocyanin recovery and purification.

Main Methods:

  • Review of compressed fluid extraction (CFE) techniques, including subcritical and supercritical fluid extraction (SFE) and pressurized liquid extraction (PLE).
  • Exploration of deep eutectic solvents (DES) as novel, environmentally friendly extraction media for anthocyanins.
  • Assessment of counter-current chromatography (CCC) as a scalable and cost-effective purification technology.

Main Results:

  • Compressed fluid-based and deep eutectic solvent extraction methods offer promising alternatives for efficient and selective anthocyanin recovery.
  • Counter-current chromatography presents a viable, faster, and more economical purification method compared to traditional preparative HPLC.
  • These advanced techniques aim to overcome the limitations of conventional methods, improving yield and purity of anthocyanins.

Conclusions:

  • Advanced extraction and purification technologies are crucial for meeting the growing demand for high-value anthocyanins.
  • Compressed fluid and deep eutectic solvent-based methods, coupled with counter-current chromatography, represent a significant advancement in anthocyanin recovery.
  • Future research should focus on optimizing these green technologies for industrial-scale anthocyanin production.