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Optimization of the extraction of polyphenols from Pinus pinaster residues using deep eutectic solvents: a sustainable approach

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Abstract

In the present investigation, the optimization of a pressurized solid–liquid extraction of polyphenols from Pinus pinaster Aiton needles and bark residues has been carried out using new deep eutectic solvent systems (DES). A Box–Behnken design with response surface methodology was implemented, with six variables, including solid:liquid ratio, water content, temperature, extraction time, reactor closure state, and catalyst concentration. The DES consisting of levulinic acid: formic acid exhibited the highest content, and the optimal conditions were determined to be 0.10 g of residue in 10 mL of solvent (without water) and without catalyst, at 60 °C for 5 min. The method demonstrated excellent repeatability and intermediate precision, with a coefficient of variation of less than 5%. In addition, the antimicrobial and antioxidant activities of the polyphenol-enriched extracts were evaluated, obtaining a total reduction in S. aureus cell growth and remarkable antioxidant levels of 144.72 ± 4.24 and 161.01 ± 4.70 mg Trolox equivalents/gram for needle and bark residues, respectively. Under the optimized conditions, the new DES are remarkably superior to conventional solvents and can be recycled and reused, demonstrating that these systems have a promising environmental profile, making them valuable alternatives for biomass fractionation.

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Acknowledgements

María José Aliaño-González would like to thank the University of Cádiz for the grant in the modality "Margarita Salas," of the call for the Recualification of the Spanish University System for 2021–2023 (Resolution of the Rector of the University of Cadiz UCA/R155REC/2021, of 2 July), and financed by the Ministry of Universities of the Government of Spain through the European Recovery Instrument "Next Generation EU," of the European Union (Order UNI/551/2021, of 26 May).

Funding

This research was funded by National Funds through FCT—Foundation for Science and Technology under the Project UIDB/05183/2020. This work was also supported by funding from the Portuguese Foundation for Science and Technology (FCT) through the projects PTDC/ASP-SIL/30619/2017, UIDB/05183/2020 and the researcher Grant CEECIND/01014/2018.

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Hugo Duarte: Formal analysis; investigation; writing—original draft; software. Valentim Soares Gomes: Formal analysis; investigation; writing—original draft; data curation. María José Aliaño–González: Conceptualization; methodology; writing—review & editing; supervision. Anabela Romano: Resources; visualization; project administration; funding acquisition; review & editing. Leonor Faleiro: methodology; resources; visualization; project administration. Bruno Medronho: Validation; resources; writing—review & editing; supervision.

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Correspondence to María José Aliaño-González.

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Duarte, H., Gomes, V., Aliaño-González, M.J. et al. Optimization of the extraction of polyphenols from Pinus pinaster residues using deep eutectic solvents: a sustainable approach. Wood Sci Technol 57, 1175–1196 (2023). https://doi.org/10.1007/s00226-023-01493-3

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  • DOI: https://doi.org/10.1007/s00226-023-01493-3

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