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Open AccessArticle

Extraction of High Value Triterpenic Acids from Eucalyptus globulus Biomass Using Hydrophobic Deep Eutectic Solvents

CICECO-Aveiro Institute of Materials, Chemistry Department, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
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Academic Editor: Mert Atilhan
Molecules 2020, 25(1), 210; https://doi.org/10.3390/molecules25010210
Received: 9 December 2019 / Revised: 23 December 2019 / Accepted: 31 December 2019 / Published: 4 January 2020
(This article belongs to the Special Issue Deep Eutectic Solvents)
Triterpenic acids (TTAs), known for their promising biological properties, can be found in different biomass sources and related by-products, such as Eucalyptus globulus bark, and have been extracted using organic volatile solvents such as dichloromethane. Recently, deep eutectic solvents (DES) have been identified as promising alternatives for the extraction of value-added compounds from biomass. In the present work, several hydrophobic DES were tested for the extraction of TTAs from E. globulus bark. Initial solubility studies revealed that DES based on menthol and thymol as the most promising solvents for these compounds given the highest solubilities obtained for ursolic acid (UA) at temperatures ranging from room temperature up to 90 °C. Accordingly, an eutectic mixture of menthol:thymol (1:2) was confirmed as the best candidate for the TTAs extraction from E. globulus outer bark, leading to extraction yields (weight of TTA per weight of biomass) at room temperature of 1.8 wt% for ursolic acid, 0.84 wt% for oleanolic acid and 0.30 wt% for betulinic acid. These values are significantly higher than those obtained with conventional organic solvents under similar conditions. The results obtained using these DES are promising for the recovery of TTAs for nutraceutical and pharmacological applications, while reinforcing the potential of DES as promising solvents to be applied in biorefinery processes. View Full-Text
Keywords: triterpenic acids; ursolic acid; Eucalyptus globulus outer bark; hydrophobic deep eutectic solvents; menthol; thymol triterpenic acids; ursolic acid; Eucalyptus globulus outer bark; hydrophobic deep eutectic solvents; menthol; thymol
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MDPI and ACS Style

Silva, N.H.C.S.; Morais, E.S.; Freire, C.S.R.; Freire, M.G.; Silvestre, A.J.D. Extraction of High Value Triterpenic Acids from Eucalyptus globulus Biomass Using Hydrophobic Deep Eutectic Solvents. Molecules 2020, 25, 210.

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