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Dragon fruit (Hylocereus spp.) seed oils: their characterization and stability under storage conditions

Wijitra Liaotrakoon (UGent) , Nathalie De Clercq (UGent) , Vera Van Hoed (UGent) and Koen Dewettinck (UGent)
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Abstract
Oil was extracted from the seeds of white-flesh and red-flesh dragon fruits (Hylocereus spp.) using a cold extraction process with petroleum ether. The seeds contained significant amounts of oil (32–34 %). The main fatty acids were linoleic acid (C18:2, 45–55 %), oleic acid (C18:1, 19–24 %), palmitic acid (C16:0, 15–18 %) and stearic acid (C18:0, 7–8 %). The seed oils are interesting from a nutritional point of view as they contain a large amount of essential fatty acids, amounting to up to 56 %. In both dragon fruit seed oils, tri-unsaturated triacylglycerol (TAG) was mainly found while their TAG composition and relative percentage however varied considerably. Therefore, they showed a different melting profile. A significant amount of total tocopherols was observed (407–657 mg/kg) in which the a-tocopherol was the most abundant (*72 % of total tocopherol content). The impact of storage conditions, cold and room temperatures, on the oxidative stability and behavior of tocopherols was monitored over a 3-month storage period. During storage, the oxidative profile changed with a favorably low oxidation rate (*1 mequivO2/week) whilst tocopherols decreased the most at room temperature. After 12 weeks, the total tocopherol content, however, still remained high (65–84 % compared to the initial oils). Hereto, the dragon fruit seed oils can be considered as a potential source of essential fatty acids and tocopherols, with a good oxidative resistance.
Keywords
Physicochemical properties, Triacylglycerol, Tocopherols, Essential fatty acids, Dragon fruit seed oil, Storage conditions, Fatty acid composition, Oxidative stability, Thermal properties, GRAPE SEED, TOCOPHEROL, OXIDATION, EXTRACTS, LIQUID

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Citation

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MLA
Liaotrakoon, Wijitra, Nathalie De Clercq, Vera Van Hoed, et al. “Dragon Fruit (Hylocereus Spp.) Seed Oils: Their Characterization and Stability Under Storage Conditions.” JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY 90.2 (2013): 207–215. Print.
APA
Liaotrakoon, W., De Clercq, N., Van Hoed, V., & Dewettinck, K. (2013). Dragon fruit (Hylocereus spp.) seed oils: their characterization and stability under storage conditions. JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 90(2), 207–215.
Chicago author-date
Liaotrakoon, Wijitra, Nathalie De Clercq, Vera Van Hoed, and Koen Dewettinck. 2013. “Dragon Fruit (Hylocereus Spp.) Seed Oils: Their Characterization and Stability Under Storage Conditions.” Journal of the American Oil Chemists Society 90 (2): 207–215.
Chicago author-date (all authors)
Liaotrakoon, Wijitra, Nathalie De Clercq, Vera Van Hoed, and Koen Dewettinck. 2013. “Dragon Fruit (Hylocereus Spp.) Seed Oils: Their Characterization and Stability Under Storage Conditions.” Journal of the American Oil Chemists Society 90 (2): 207–215.
Vancouver
1.
Liaotrakoon W, De Clercq N, Van Hoed V, Dewettinck K. Dragon fruit (Hylocereus spp.) seed oils: their characterization and stability under storage conditions. JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY. 2013;90(2):207–15.
IEEE
[1]
W. Liaotrakoon, N. De Clercq, V. Van Hoed, and K. Dewettinck, “Dragon fruit (Hylocereus spp.) seed oils: their characterization and stability under storage conditions,” JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, vol. 90, no. 2, pp. 207–215, 2013.
@article{3055580,
  abstract     = {{Oil was extracted from the seeds of white-flesh and red-flesh dragon fruits (Hylocereus spp.) using a cold extraction process with petroleum ether. The seeds contained significant amounts of oil (32–34 %). The main fatty acids were linoleic acid (C18:2, 45–55 %), oleic acid (C18:1, 19–24 %), palmitic acid (C16:0, 15–18 %) and stearic acid (C18:0, 7–8 %). The seed oils are interesting from a nutritional point of view as they contain a large amount of essential fatty acids, amounting to up to 56 %. In both dragon fruit seed oils, tri-unsaturated triacylglycerol (TAG) was mainly found while their TAG composition and relative percentage however varied considerably. Therefore, they showed a different melting profile. A significant amount of total tocopherols was observed (407–657 mg/kg) in which the a-tocopherol was the most abundant (*72 % of total tocopherol content). The impact of storage conditions, cold and room temperatures, on the oxidative stability and behavior of tocopherols was monitored over a 3-month storage period. During storage, the oxidative profile changed with a favorably low oxidation rate (*1 mequivO2/week) whilst tocopherols decreased the most at room temperature. After 12 weeks, the total tocopherol content, however, still remained high (65–84 % compared to the initial oils). Hereto, the dragon fruit seed oils can be considered as a potential source of essential fatty acids and tocopherols, with a good oxidative resistance.}},
  author       = {{Liaotrakoon, Wijitra and De Clercq, Nathalie and Van Hoed, Vera and Dewettinck, Koen}},
  issn         = {{0003-021X}},
  journal      = {{JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY}},
  keywords     = {{Physicochemical properties,Triacylglycerol,Tocopherols,Essential fatty acids,Dragon fruit seed oil,Storage conditions,Fatty acid composition,Oxidative stability,Thermal properties,GRAPE SEED,TOCOPHEROL,OXIDATION,EXTRACTS,LIQUID}},
  language     = {{eng}},
  number       = {{2}},
  pages        = {{207--215}},
  title        = {{Dragon fruit (Hylocereus spp.) seed oils: their characterization and stability under storage conditions}},
  url          = {{http://dx.doi.org/10.1007/s11746-012-2151-6}},
  volume       = {{90}},
  year         = {{2013}},
}

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