Optimization of date seed oil extraction using the assistance of hydrothermal and ultrasound technologies
DOI:
https://doi.org/10.3989/gya.0109211Keywords:
Date seed, Hydrothermal technology, Oil extraction, Oxidation stability, Response surface methodology, SonicationAbstract
The date seed is a by-product from the date industry. Its use as a source of added-value compounds is of great interest. Oil accounts for 5-13% of the seed’s weight. Soxhlet extraction with organic solvents is the traditional method for obtaining oil from seeds. In this work, hydrothermal pre-treatments and sonication are proposed to make the extraction a more environmentally friendly process. Factors such as sonication time and temperature and hexane-to-seed ratio (H/S) have been considered. Response surface methodology was applied for optimization. Hydrothermal treatments increased oil recovery. H/S was the most influential factor, and was close to 7 mL/g seeds for both samples. 71% recovery was achieved for native seeds after 15 min sonication at 45 ºC, and 80% for 180 ºC-treated seeds after 45 min at 35 ºC when compared to Soxhlet extraction. These conditions comply with our initial aim. Pre-treatments seem to have a negative effect on oil stability, although this observation needs to be confirmed.
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Funding data
Université de Liège
Grant numbers P.AGABQSP01-02 (A.M.)
Ministerio de Ciencia e Innovación
Grant numbers Project 25/Section II-2019;PCI2020-112088
Agencia Estatal de Investigación
Grant numbers Project 25/Section II-2019;PCI2020-112088
European Commission
Grant numbers Project 25/Section II-2019;PCI2020-112088