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Articles by D.E. Okwu
Total Records ( 5 ) for D.E. Okwu
  D.E. Okwu
  Samples of two Nigerian medicinal plants (Garcinia Kola Heckel) and (Aframomum melegueta) were analyzed for their phytochemical composition, vitamins and minerals constituents. The result revealed the presence of bioactive constituents comprising: flavonoids (5.76-1.98 mg 100 1g), phenols (0.09-0.11 mg 100 1g), saponins (1.24-11.48 mg 100 1g), tannins, (0.26-0.38 mg/100g). The medicinal plants contained ascorbic acid (12.32-23.10 mg 100 1g), niacin (0.05-1.60 mg 100 1g), riboflavin (0.22- 0.26 mg 100 1g) and thiamin (0.24-0.45 mg 100 1g). The plants are good sources of minerals such as: Ca, P, K, Mg, Na. Fe, Zn, Mn and Cu. These substances may be responsible for the health related properties of the plants, which are based on their antioxidant, anticancer, anti-tumor antiviral, anti-inflammatory and anti-allergic activities. These supports the popular use of G. Kola and A. melegueta in herbal medicine in South Eastern Nigeria.
  D.E. Okwu and I.N. Emenike
  Phhytochemical studies of five varieties of citrus species; sweet orange (Citrus sinensis), tangerine (Citrus reticulata), lemon (Citrus limonum), lime (Citrus aurantifolia) and grape (Citrus grandis) revealed the presence of bioactive compounds comprising alkaloids (0.33-0.04 mg 100 g 1), flavonoids (0.19-0.57 mg 100 g 1), phenols (0.01-0.42 mg 100 g 1) and tannins (0.01-0.04 mg 100 g 1). These citrus fruits are good sources of water-soluble vitamins: ascorbic acids (19.36-61.60 mg 100 g 1), riboflavin (0.01-0.11 mg 100 g 1), thiamin (0.06-0.12 mg 100 g 1) and niacin (0.03-0.43 mg 100 g 1). These phytonutrients and vitamins may be responsible for the antioxidants, anticancer, anti-inflammatory properties of the citrus species. The citrus spices have their popular use in herbal medicine and as fruits in Nigeria.
  Ibisi, N.E. , D.E. Okwu and M.M. Ekwenchi
  Tar sand samples obtained from different locations in Olowo/Irele, Iwopin, Agbabu and Ofosu/Oshosu in Ondo State, Nigeria were pyrolysed at three different temperatures: 100, 150 and 200C. A detailed analysis was conducted on the pyrolysed samples after an exhaustive soxhlet extraction with benzene as solvent. The percentage of the oil obtained at different temperatures increases as the temperature increases. Column chromatographic method was used to elute five different fractions comprising: saturates, monoaromatics, diaromatics, polyaromatics and polars/resins. These results indicate that tar sands can be potential sources of feedstock for the petrochemical industry in the country.
  I.A. Okoro , D.E. Okwu and U.S. Emeka
  The Kinetics of sorption and intarparticute diffusivity of crude oil using kenaf (Hibiscus cannabinus L.) plant parts was studied. The amount of crude oil adsorbed increased with time. The amount of crude oil adsorbed were 11. 86, 9.92, 7.54 and 7.10 mg mL 1 for the roots and stems respectively. The fractional attainment of equilibrium, values showed that the stem parts research equilibrium point before the root parts. This study has showed that the sorption of crude oil on kenaf (Hibiscus cannabinus L.) plant parts is particle diffusion controlled. The rate coefficient for particle diffusion were 0.015 and 0.007 mm-1 for the root parts and stem parts, respectively.
  D.E. Okwu and I.N. Emenike
  The mineral and nutrient composition of five varieties of Citrus species: sweet orange (Citrus sinensis), tangerine (Citrus reticulata), lemon (Citrus limonum), lime (Citrus aurantifolia) and grape (Citrus grandis) were determined. The research showed that these citrus fruits contained crude protein (10.94-17.06%), crude fiber (5.84-7.10%), carbohydrate (70.86-77.10%), moisture (4.28-5.70%), crude lipid (0.64-1.24%), ash (4.40-7.80%) and food energy content was (347.04-363 g cal 1) of fresh fruits. The most important minerals detected in the fruits include calcium (2.0-3.20%), phosphorus (0.24-0.41%), potassium (0.28-1.0%), magnesium (0.49-0.61%) and sodium (0.28-0.36%). These nutrients are indispensable for the good condition of our health. This study justifies the use of citrus fruits as food and drug in herbal medicine in Southeastern Nigeria.
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