Improving the canolol amount and the yield of expressed canola oil applying combined pre-treatments
Canolol is a potent natural antioxidant. It exhibits anti-mutagenic and anti-carcinogenic properties, showing an even more potent anti-mutagenic activity than that of α-tocopherol and flavonoids. This compound is formed due to high temperatures during processing of some seeds of Brassica family, lik...
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| Autores Principales: | , , , |
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| Formato: | Journal Contribution |
| Lenguaje: | English |
| Publicado: |
2021
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| Materias: | |
| Acceso en línea: | http://agris.upm.edu.my:8080/dspace/handle/0/18808 |
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| Sumario: | Canolol is a potent natural antioxidant. It exhibits anti-mutagenic and anti-carcinogenic properties, showing an even more potent anti-mutagenic activity than that of α-tocopherol and
flavonoids. This compound is formed due to high temperatures during processing of some seeds of Brassica family, like canola. The nutritional value of canola oil can be increased by increasing the content of canolol, subjecting the seeds to different pre-treatments (steam, microwaves). The aim of the present work was to study the treatments applied to canola seeds
in order to improve the quality of the expressed oil, increasing the amount of canolol, and also to obtain higher yields of oil by pressing. Canola seeds were subjected to different treatments:
hydrothermal (HT), by exposing the grains to steam in an autoclave; microwave (MW), irradiation in a microwave oven; combination of both treatments (HT-MW), exposing the
seeds to water vapour and then microwaved until grains reached 7% moisture (dry basis). Oil was extracted from pre-treated and untreated samples by pressing using a helical screw press.
Oil yield was determined by evaluating the residual oil remaining in the press cake. Canolol content was determined in all samples by HPLC. HT-MW significantly increased the amount
of canolol in oil (495 ppm, in contrast with 5 ppm in untreated samples) and significantly improved its oxidative stability. Moreover, HT-MW generated the highest oil yield (86%).
Pressing untreated canola yielded 68%, while HT yielded 76%, and MW only yielded 8%. SEM micrographs showed a more open structure in HT-MW samples which could have improved the availability of oil, favouring the oil expression process. |
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