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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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Solid-liquid Extraction of Phenolics from Red Grape Skins.

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    A new, efficient method for extracting flavonoids from grape skins was developed. This technique optimizes solvent composition, temperature, and time for improved grape and wine quality analysis.

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    Area of Science:

    • * Food Science
    • * Analytical Chemistry
    • * Agricultural Science

    Background:

    • * Flavonoids are crucial for grape and wine quality.
    • * Accurate characterization of grape cultivars relies on flavonoid profiling.

    Purpose of the Study:

    • * To develop a novel, efficient extraction method for flavonoids from grape skins.
    • * To optimize solid-liquid extraction parameters for key flavonoid compounds.

    Main Methods:

    • * Response surface methodology was employed for optimization.
    • * Key parameters investigated: organic solvent type and percentage, extraction temperature, and time.
    • * Optimal conditions determined for acetonitrile:water:formic acid (20:79:1 v/v/v) solvent system.

    Main Results:

    • * Optimal extraction achieved at 50 °C for 1 hour.
    • * A solid-to-solvent ratio of 1:80 g mL⁻¹ was identified as ideal.
    • * The method demonstrated efficiency for anthocyanins, flavonols, and flavan-3-ols.

    Conclusions:

    • * A cost-effective, rapid, and accurate method for flavonoid extraction from grape skins was established.
    • * The developed method is suitable for the selective recovery of simple flavonoids.
    • * This technique supports enhanced grape and wine quality assessment.