Abstract
The main objective of this study was to recover hydroxytyrosol from olive mill waste (olive leaves and a semi-solid waste with a 65–75% of humidity called alperujo). The recovery process involved solid–liquid extractions using two hydrophilic deep eutectic solvents (DESs), CIS-DES (a 1:1 mixture of choline chloride and citric acid) and Etagline (a 1:2 mixture of choline chloride and ethylene glycol). The results achieved using this non-conventional process was compared with the results achieved using conventional solid–liquid extraction processes using ethanol, methanol, and water. The extraction ratio (R) achieved using Etagline DES was 11.4 times higher than the R achieved using methanol. The hydroxytyrosol extraction efficiencies were higher when using the selected DESs than using methanol, under the same working conditions. On the other hand, with the use of DES it is possible to obtain similar extraction efficiencies to those obtained with organic solvents, but using 75% less extraction phase, when DESs were used instead of methanol. The DES extraction processes gave high re-extraction capacities when supercritical CO2 was used as a stripping phase. The highest pure hydroxytyrosol extraction efficiency, 80%, was achieved using Etagline and supercritical CO2 re-extraction at a pressure and temperature close to the critical values. The results suggest that DES is an efficient, safe, and sustainable alternative to methanol for extracting bioactive compounds from olive mill waste and that DES extraction combined with supercritical CO2 extraction can be classed as a green process.
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Abbreviations
- HT:
-
Hydroxytyrosol
- T:
-
Tyrosol
- OI:
-
Oleuropeine
- OMW:
-
Olive mill waste
- OL:
-
Olive leaves
- DESs:
-
Deep Eutectic Solvents
- CO2 :
-
Carbon dioxide
- EtOH:
-
Ethanol
- MetOH:
-
Methanol
- HPLC:
-
High performance liquid chromatography
- R:
-
Extraction ratio
- SCE:
-
Supercritical fluid extraction
- GAE:
-
Gallic acid equivalent
- w/w:
-
Refer to mass fraction
- v/v:
-
Referred to volume/volume percent
- DW:
-
Dry waste
- S/L:
-
Solid/liquid extraction process
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Acknowledgements
This study was performed as part of the research projects FONDECYT de Iniciación 11150255 and Project POSTDOC_DICYT, Código 0217111RF, Vicerrectoría de Investigación, Desarrollo e Innovación, Universidad de Santiago de Chile, Usach.
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Plaza, A., Tapia, X., Yañez, C. et al. Obtaining Hydroxytyrosol from Olive Mill Waste Using Deep Eutectic Solvents and Then Supercritical CO2. Waste Biomass Valor 11, 6273–6284 (2020). https://doi.org/10.1007/s12649-019-00836-1
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DOI: https://doi.org/10.1007/s12649-019-00836-1