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Articles by Adel S. Al-Zubairi
Total Records ( 2 ) for Adel S. Al-Zubairi
  Ghanya N. Al-Naqeep , Maznah M. Ismail , Adel S. Al-Zubairi and Norhaizan M. Esa
  This study was carried out to investigate the nutrients composition of Nigella sativa seed and its minerals content, cultivated in three different regions in Yemen, namely Marib, Sadah and Taiz. Proximate analysis, Total Dietary Fiber (TDF), Insoluble Dietary Fiber (IDF) and Soluble Dietary Fiber (SDF) were determined using the Association of Official Analytical Chemists methods. Minerals content of N. sativa seeds was determined by the Atomic Absorption Spectrophotometry (AAS). The proximate analysis of N. sativa seeds showed that moisture content was 6.8±0.3, 4.6±0.1 and 7.2±0.14% for Marib, Sadah and Taiz samples, respectively. The seeds showed to have high content of TDF which was 36.88±1.44, 26.50±1.05, 30.40±1.06%, IDF 27.10±0.55, 20.56±1.16, 22.40±1.40% and SDF 8.90±1.17, 6.50±0.60, 8.13±0.71% for Marib, Sadah and Taiz samples, respectively. Minerals content analysis of N. sativa seeds showed the seeds to be a rich source of calcium, magnesium, potassium, phosphorus and iron. Present results revealed that N. sativa seeds contain several nutrients with potential value.
  Ghanya Al-Naqeeb , Maznah Ismail and Adel S. Al-Zubairi
  Nigella sativa (N. sativa) is popularly known as the black seed, a herb that has traditionally been used for centuries in many parts of the world. It has gained popularity due to its potential health benefits. However, more scientific data is needed to support the various health claims. This study was carried out to determine the fatty acid profile, α-tocopherol content and to evaluate the antioxidant activity of seed oil samples from three different regions in Yemen namely Marib, Sadah and Taiz. N. sativa seeds oil was extracted using three different solvents (n-hexane, petroleum ether and chloroform: methanol 2:1 v/v) and the fatty acids composition was analyzed using gas chromatography, while the α-tocopherol was determined using HPLC. Ferric thiocyanate (FTC) and thiobarbituric acid (TBA) methods were used to evaluate the antioxidant activity of the seeds oil. Results indicated that N. sativa seeds contain high amount of oil (30-48%) and the major unsaturated fatty acids were linoleic acid (57.96, 58.04 and 57.04%) followed by oleic acid (21.49, 20.87 and 20.60%), while the main saturated fatty acids were palmitic (11.56, 11.23 and 11.22%), followed by stearic and myristic acids in Marib, Taiz and Sadah samples respectively. Oil extracts exhibited strong antioxidant properties when compared to α-tocopherol with 78-82% inhibition in the FTC method and 70-80% in the TBA assays. The oil extracts were found to be rich in α-tocopherol content 290±1.5, 170±0.40 and 120±0.15 mg/100 g, in Marib, Sadah and Taiz samples, respectively. Present results suggest that N. sativa seeds contain high amount of antioxidants that are essential for health and preventing numerous diseases.
 
 
 
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