Extraction of flavonoid compounds from bark using sustainable deep eutectic solvents

https://doi.org/10.1016/j.scp.2021.100544Get rights and content
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Highlights

  • All aqueous mixtures of DES showed an improvement in pine bark extraction yield.

  • ChCl:1,4-butadienol was a selective solvent for flavonoid compound extraction.

  • ChCl:urea was not a good solvent for the extraction of flavonoid compounds.

  • All the ChCl:1,4-butadienol/H2O extracts showed high antioxidant capacities.

  • ChCl:1,4-butadienol 75 wt% was the best solvent for pine bark flavonoids.

Abstract

The use of green solvents in extraction processes, especially for applications of lignocellulosic biomass, has been extensively studied over the last years. Among the range of different green solvents, deep eutectic solvents (DES) show promising results for extraction processes. Therefore, the aim of this work was the use of DES as additives in aqueous mixtures for the selective extraction of flavonoid compounds from the bark of Larix decidua. For this purpose, bark has been treated using different solvent ratios consisting of a DES/H2O mixture (0, 25, 50 and 75 wt%). Two DES were studied, choline chloride:urea and choline chloride:1,4-butanediol. In order to study the success of the extractions, the extracts and the remaining solid fraction were characterised. From the results, it was concluded that the choline chloride:1,4-butanediol (75 wt%) gave the best results, obtaining the richest extracts in flavonoids (383 mg CE/g dried bark extract), as well as those with the highest antioxidant capacity. These good results confirm the capacity of this DES to obtain active biomolecules for further application.

Keywords

Flavonoids
Deep eutectic solvents
Bark
Extraction

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