Recovery techniques for Hydroxynaphthoquinone Enantiomers of Alkanna tinctoria (L.) from Natural Deep Eutectic Solvents: A Comparative Analysis

Elodie Bossard; Nikolaos Tsafantakis; Nektarios Aligiannis; Ioanna Chinou; Nikolas Fokialakis

doi:10.1055/a-2563-7599

Planta Medica, Table of Contents

Planta Med 2025; 91(08): 440-450
DOI: 10.1055/a-2563-7599

Original Papers

Recovery techniques for Hydroxynaphthoquinone Enantiomers of Alkanna tinctoria (L.) from Natural Deep Eutectic Solvents: A Comparative Analysis

Elodie Bossard

Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece

,

Nikolaos Tsafantakis

Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece

,

Nektarios Aligiannis

Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece

,

Ioanna Chinou

Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece

,

Nikolas Fokialakis

Division of Pharmacognosy and Natural Products Chemistry, Department of Pharmacy, School of Health Sciences, National and Kapodistrian University of Athens, Athens, Greece

› Author Affiliations

Abstract

A natural deep eutectic solvent (NaDES) composed of levulinic acid and glucose using a molar ratio of 5 : 1 (mol_HBA:mol_HBD) and 20% of water (w/w) (LeG_5_20) was found as a great alternative to the commonly used organic solvents for the extraction of hydroxynaphthoquinone enantiomers (HNQs) from Alkanna tinctoria (L.) Tausch roots. In the present work, a comparative investigation of recovery methods for HNQs, such as solid-phase extraction, macroporous resin, and water as an anti-solvent, was performed to face the main disadvantage of NaDES: the inability to be evaporated. The highest recovery of HNQs was recorded using the solid-phase extraction on a reversed-phase C8 cartridge with a total hydroxynaphthoquinone content (TNC) of 46.79 ± 0.952 mg/g of dry weight (DW). In addition, a great recovery of HNQs was also reported for the macroporous resin Amberlite XAD 4 with a TNC value of 37.21 ± 1.789 mg/g DW, while the precipitation of HNQs by using water as an anti-solvent (1 : 5, v/v) offered a TNC value of 28.68 ± 0.023 mg/g DW. The macroporous resin Amberlite XAD also showed a great potential for larger-scale applications. In fact, the developed scale-up process, involving Amberlite XAD 4, showed a great recovery efficiency for HNQs (34.126 ± 1.093 mg/g DW), an acceptable robustness (RSD < 15%), and the possibility of recycling LeG_5_20 with a recovery greater than 50%; therefore, it is an excellent green alternative extraction procedure for HNQs.

Keywords

natural deep eutectic solvent - recovery - recycling - Alkanna tinctorial - hydroxynaphthoquinone enantiomers

Full Text

References

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Supporting Information