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Enhanced extraction of phenolic compounds from mango by-products using deep eutectic solvents.

Gonzalo A Ojeda1, Margarita M Vallejos1, Sonia C Sgroppo1

  • 1Instituto de Química Básica y Aplicada del Nordeste Argentino (IQUIBA-NEA-CONICET), Universidad Nacional del Nordeste (UNNE), Av. Libertad 5400, Corrientes, Argentina.

Heliyon
|July 24, 2023
PubMed
Summary

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Deep eutectic solvents (DESs) efficiently extract polyphenolic compounds from mango by-products. These novel solvents significantly enhance extraction yields from mango peel and seed, offering a sustainable approach.

Area of Science:

  • Green Chemistry
  • Food Chemistry
  • Biotechnology

Background:

  • Mango by-products, including peel and seed, are rich sources of polyphenolic compounds (PC).
  • Traditional extraction methods often use harsh solvents and have limited efficiency.
  • Deep eutectic solvents (DESs) offer a promising alternative for sustainable extraction.

Purpose of the Study:

  • To evaluate the potential of DESs for extracting polyphenolic compounds from mango peel and seed.
  • To compare the efficacy of different DES formulations and extraction techniques (ultrasound vs. agitation).
  • To characterize the extracted compounds and understand the underlying interactions between DES and polyphenols.

Main Methods:

  • Extraction of polyphenolic compounds using various DES formulations and conventional solvents (ethanol/methanol).
Keywords:
BioactiveDFTEutectic solventMangiferinMango

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  • Application of ultrasound (US) and agitation as extraction methodologies.
  • Characterization of extracts using antioxidant capacity assays and High-Performance Liquid Chromatography with Diode-Array Detection (HPLC-DAD).
  • Theoretical analysis using density functional theory (DFT) and the Quantum Theory of Atoms in Molecules (QTAIM) approach.

    • Main Results:

    • β-alanine and choline chloride-based DESs demonstrated high efficiency in extracting PC from both mango peel and seed.
    • DESs significantly increased PC extraction yields, up to three times for peel and five times for seeds, compared to conventional solvents.
    • Mangiferin extraction from mango peels was notably enhanced using β-alanine based DES.
    • The study identified a correlation between hydrogen bond strength, DES viscosity, and extraction efficiency.
    • Solute-solvent solvation energy proved effective in estimating DES-polyphenol interactions.

    Conclusions:

    • DESs exhibit remarkable capacity for extracting valuable polyphenolic compounds from mango by-products.
    • The choice of DES and extraction method significantly influences the yield and profile of extracted PC.
    • This research provides valuable insights into the application of DESs for sustainable valorization of agro-industrial waste.