Antioxidant (Tocopherol and Canolol) Content in Rapeseed Oil Obtained from Roasted Yellow‐Seeded <i>Brassica napus</i>

Siger, Aleksander; Gawrysiak‐Witulska, Marzena; Bartkowiak-Broda, I.

doi:10.1007/s11746-016-2921-7

Cited by 36 publications

(28 citation statements)

References 32 publications

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“…It is also characterized by a fatty acid ratio of n-6:n-3 (equal to about 2:1), which is optimal from a nutritional point of view. Rapeseed and the oil produced from it are good sources of biologically active compounds, such as phytosterols, tocochromanols and phenolic compounds (Siger et al, 2017a;2018a;Vlahakis and Hazebroek, 2000).…”

Section: Introductionmentioning

confidence: 99%

The quality of cold-pressed rapeseed oil obtained from seeds of Brassica napus L. with increased moisture content

Rokosik

Dwiecki

Siger

2019

Acta Sci Pol Technol Aliment

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Background. The basic parameter influencing the quality of cold-pressed oil is the quality of seeds used for pressing. Adverse moisture content and storage temperature of rape seeds may affect the quality of oil obtained from them. This paper presents the effects of increased rapeseed moisture content on the quality of the oil pressed. Material and methods. The material used for the tests was rapeseed (canola) cv. PR 46 W14. The moisture content of the seeds was adjusted to 10%, 12% and 20%, and the seeds were stored at room temperature for 14 days. The samples were then dried to a seed moisture equal to 7% and oil was pressed from them. Acid and peroxide values, as well as the content of water, tocopherols and phenolic acids, were determined. In addition, a sensory analysis of the oil samples was carried out, and structural changes in the association colloids in the oil were determined using a fluorescent probe. Results. With the increase in seed moisture, the increase in peroxide and acid values of the analyzed oils was recorded. A slight decrease in tocopherol content and a significant increase in phenolic acid concentration, depending on the seed moisture content, was observed. Sensory analysis showed odor sensory profile changes that probably indicate microflora development. Conclusion. The rapeseed moisture content has a crucial influence on the quality of oil obtained from them. Along with an increase in seed moisture, the possibility of developing undesirable microflora grows, which results in a deterioration in the quality of the obtained oil.

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Section: Introductionmentioning

confidence: 99%

The quality of cold-pressed rapeseed oil obtained from seeds of Brassica napus L. with increased moisture content

Rokosik

Dwiecki

Siger

2019

Acta Sci Pol Technol Aliment

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“…The stability of tocopherols in expeller pressed oil stored at 21 °C, together with the much reduced levels of oxidation, compared to solvent extract oils, suggest that other compounds may be present in the expeller press oils that offer enhanced protection against oxidation during storage. One possibility is 2,6‐dimethoxy‐4‐vinyl phenol (DMVP), or canolol as it is more commonly known, which has been reported to be greatly enhanced by heating or roasting canola seeds prior to oil extraction or in those oil extraction techniques that involve heat . The antioxidant activity of canolol is widely recognised, and has been established previously via observations of negative correlations between canolol content and oxidation levels .…”

Section: Resultsmentioning

confidence: 99%

Effects of Storage Temperature and Duration on Bioactive Concentrations in the Seed and Oil of Brassica napus (Canola)

Flakelar

Doran

Howitt³

et al. 2017

Euro J Lipid Sci & Tech

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The effects of storage temperature and duration on phytosterol, tocopherol and carotenoid concentrations are assessed in canola seed, and oil extracted using two different techniques, over a 10 month period. Increases to oxidation indices (K232, K270 and ΔK) are observed in the solvent extracted oils, and in the seed stored at 40 °C, indicating the formation of primary and secondary oxidation products. Only small decreases in the concentrations of γ‐tocopherol and β‐carotene are observed across the 10 month period. Phytosterol concentration decreases over time, with similar degradation rates observed in both seed and oils. α‐tocopherol and lutein are well preserved up to 7 months in all samples, despite oil oxidation, and further research will be needed to identify the cause for retention of bioactives. The results indicate that in order to preserve phytosterols, tocopherols and carotenoids in seed stored in bulk for extended periods, storage temperatures should remain at or below 21 °C. Moreover, oil stored at 4 °C or −18 °C, results in high bioactive concentrations and slows the onset of oil oxidation, compared to oil stored at room temperature. Practical Applications: Industrial storage conditions have been shown to greatly influence the chemical processes that occur with canola seed and oil. However, the effects of typical storage conditions on phytosterols, tocopherols and carotenoids in canola seed and extracted oil, are not yet known. This study presents the effects of typical seed and oil storage conditions on phytosterol, tocopherol and carotenoid concentrations, whilst monitoring oxidation indices and FFA, and thus provides information to seed handlers and oil processors on storage conditions that may preserve these bioactives. Moreover, the different behaviours of bioactives are examined relative to the oil extraction technique used, and present opportunities to optimise oil extraction techniques. Time series plots for α‐tocopherol concentrations in canola oil stored at different temperatures over 280 days, illustrating a difference in behaviour between the solvent extracted oil and the hand‐press extracted oil.

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“…This is probably due to the presence of phenolic compounds in camelina oil, such as synapinic acid and its derivatives. It was shown in [19,20] that these compounds possess high antioxidant properties.…”

Section: Discussion Of the Effects Of The Chemical Composition Of Thementioning

confidence: 99%

New vegetable oil blends to ensure high biological value and oxidative stability

Nosenko

Shemanska

Bakhmach

et al. 2017

EEJET

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Antioxidant (Tocopherol and Canolol) Content in Rapeseed Oil Obtained from Roasted Yellow‐Seeded Brassica napus

Cited by 36 publications

References 32 publications

The quality of cold-pressed rapeseed oil obtained from seeds of Brassica napus L. with increased moisture content

The quality of cold-pressed rapeseed oil obtained from seeds of Brassica napus L. with increased moisture content

Effects of Storage Temperature and Duration on Bioactive Concentrations in the Seed and Oil of Brassica napus (Canola)

New vegetable oil blends to ensure high biological value and oxidative stability

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