Sience, Technology and Innovation Division (STID)

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Browsing Sience, Technology and Innovation Division (STID) by Author "Cheikhyoussef, Natascha"

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    Characterization of schinziophyton rautanenii (Manketti) nut oil from Namibia rich in conjugated fatty acids and tocopherol
    (Elsevier, 2018) Cheikhyoussef, Natascha
    The Schinziophyton rautanenii tree is an important food source for many communities of the African continent. Oil extracted from the Manketti nut is of great economic value, due to its unique composition and properties. In this study, the physical and chemical characteristics of the oil obtained from three extraction methods – cold pressed, traditional and Soxhlet extraction – were investigated and compared. Oil yield of the nut was found to be 42.6 ± 0.84%. Good quality characteristics, including saponification values (184–189 mg KOH/g), iodine values (120–131 g/100 g), acid values (0.959–2.44 mg KOH/g) and peroxide values (1.80–3.98 meqO2/kg) were found for the Manketti nut oil. The total tocopherol content was in the range of 144–206 mg/100 g of oil, with γtocopherol as the dominant tocopherol. The oil was rich in conjugated fatty acids, α-eleostearic (9Z,11E,13Eoctadecatrienoic acid) (24–36%) and linoleic acid (9Z,12Z-octadeca-9,12-dienoic acid) (31–32%), making it a potential candidate in the nutraceutical and cosmetics industry.
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    Physicochemical characterization, fatty acid and tocopherol content of Moringa ovalifolia (African Moringa) oil from Namibia
    (Wiley, 2018) Cheikhyoussef, Natascha
    Moringa ovalifolia tree is indigenous to Namibia and is a multipurpose tree whose leaves, pods, fruits, and flowers are edible. The tree is well adapted to the harsh climatic conditions of the region and easily cultivated. In this paper, we investigate the physicochemical characteristics of the oil extracted from M. ovalifolia seeds collected from Remhoogte Farm, Khomas region, Namibia. The oil yield was 34.86 ± 2.47%. The oil contained a high level of monounsaturated fatty acids, with oleic acid (18:1) being the dominant one. The oil had high levels of tocopherol, with a total of 44.56 mg 100 g−1 of oil, comprising α‐tocopherol (33.94 mg 100 g−1), β‐tocopherol (6.64 mg 100 g−1), and δ‐tocopherol (3.98 mg 100 g−1). High levels of stigmasterol (142.41 mg 100 g−1) and β‐sitosterol (330.70 mg 100 g−1) were also detected. The seed oil exhibited good‐quality characteristics, making it a useful new seed oil to be considered for food and nonfood applications.