Abstract
The present research work was intended to study the influence of roasting and germination of the kernel seeds of Sudanese Moringa peregrina on the physicochemical characteristics and the oxidative stability of the extracted oil. Roasting was carried out at 180 ˚C for 25 minutes, whereas germination was done at ambient conditions in a wet jute bag for 5–7 days. The oil was extracted using n-hexane in a Soxhlet extraction apparatus. The results show that the oil contains α-tocopherols (152mg/kg) and oleic acid (above 70%) as the major tocols and fatty acids, respectively. Germination reduced the peroxide value and increased the acid value in a significant way (p < 0.05) whereas the opposite trend was noticed in the case of roasting. It is crucial to note that, with the exception of the acid value of the germinated sample, peroxide and acid values remained below one meq O2/Kg of oil and one mg KOH/g of oil, respectively. The oxidative stability of the oil from the roasted sample was increased almost by 80% compared to the raw one. Roasting of the kernels prior to oil extraction is imperative for improving its oxidation resistance and the physicochemical characteristics.
Highlights
The family Moringaceae encompasses fourteen species that belong to only one genus called Moringa
With the exception of the fat content reported by Abd El Baky and El-Baroty (2013), which is in good agreement with the present study (42.23% against 40.77%, respectively), the other studies (Somali et al, 1984; Tsaknis, 1998; Al-Dabbas et al, 2012) have reported fairly higher fat contents
The increase in the mineral contents as a result of germination was attributed to the process of soaking and rinsing with tap water, which contains these elements (Bau et al, 1997)
Summary
The family Moringaceae encompasses fourteen species that belong to only one genus called Moringa. With some exceptions, they are widely distributed in most of Africa, tropical Asia, Latin America, the Caribbean, parts of North America, and Pacific Islands (Verdcourt, 1986). M. peregrina which has fascinating nutritional and medicinal uses does not receive the same attention due to its limited distribution. It is found in arid and semi-arid countries neighboring the Red Sea, from Somalia and Yemen to Israel and on to Syria.
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