Optimization of date seed oil extraction using the assistance of hydrothermal and ultrasound technologies

A.  Mrabet; G.  Rodríguez-Gutiérrez; R.  Guillén-Bejarano; R.  Rodríguez-Arcos; M.  Sindic; A.  Jiménez-Araujo

doi:10.3989/gya.0109211

Authors

A. Mrabet Instituto de la Grasa, Food Phytochemistry Department, Consejo Superior de Investigaciones Científicas (CSIC) - University of Liege - Gembloux, Department Agro-Bio Tech. https://orcid.org/0000-0001-6465-9646
G. Rodríguez-Gutiérrez Instituto de la Grasa, Food Phytochemistry Department, Consejo Superior de Investigaciones Científicas (CSIC) https://orcid.org/0000-0002-5838-1665
R. Guillén-Bejarano Instituto de la Grasa, Food Phytochemistry Department, Consejo Superior de Investigaciones Científicas (CSIC), https://orcid.org/0000-0001-9034-3012
R. Rodríguez-Arcos Instituto de la Grasa, Food Phytochemistry Department, Consejo Superior de Investigaciones Científicas (CSIC) https://orcid.org/0000-0002-0003-4345
M. Sindic University of Liege - Gembloux, Department Agro-Bio Tech https://orcid.org/0000-0002-2599-6700
A. Jiménez-Araujo Instituto de la Grasa, Food Phytochemistry Department, Consejo Superior de Investigaciones Científicas (CSIC) https://orcid.org/0000-0002-2695-4588

DOI:

https://doi.org/10.3989/gya.0109211

Keywords:

Date seed, Hydrothermal technology, Oil extraction, Oxidation stability, Response surface methodology, Sonication

Abstract

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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