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Articles by Okon D. Ekpa
Total Records ( 2 ) for Okon D. Ekpa
  Ibanga O. Isaac and Okon D. Ekpa
  The biochemical composition of two varieties of African Pear (Dacryodes edulis)-D. e. var. edulis and D. e. var. parvicarpa have been determined using standard methods. Proximate moisture content was higher in D.e. var. parvicarpa (61.40%) than in D. e. var. edulis (46.59%). This difference implies D. e. var. edulis with low moisture content is of quality and is more stable compared D. e. var. parvicarpa. The measured anti-nutrient concentrations in the two varieties of Dacryodes edulis were low and fall within the acceptable levels based on National Agency for Food and Drugs Administration and Control (NAFDAC) in Nigeria and WHO. The concentrations of essential elements in both varieties were high such that phosphorus was 4446.04 mg kg-1 in D. e. var. edulis and 3674.07 mg kg-1 in D. e. var. parvicarpa. Cu concentration of 4.08 mg kg-1 in D. e. var. edulis and 3.66 mg kg-1 in D. e. var. parvicarpa was the lowest among the mineral elements determined. On the other hand, Cd and Pb were completely below detection level and hence were not detected. The variations in the mineral concentrations were attributed to the different rates at which these elements are taken up from the soil by the plants and subsequent incorporation into the oil. The percentage of oil content (68.29%) in D. e. var. edulis was higher than that of D. e. var. parvicarpa of 54.68%. This implies vegetable oils can be extracted in commercial quantity from D. e. var. edulis.
  Okon D. Ekpa and Ibanga O. Isaac
  Polyesterification of unsaturated oils-coconut, soybean and palm kernel oils with glycerol and phthalic anhydride was investigated at 280°C. The oil content for the three resin samples was 60% each. The kinetic behaviour of the polyesterification and the resulting alkyd resins, were studied as a function of conversion and the reaction time. The relationship between the degree of polymerization, and reaction time show that the formation of long oil alkyds of coconut, soybean and palm kernel oils follows a second order kinetics with slight deviation from linearity at the onset of the reaction. This deviation suggests the occurrence of chain branching at relatively short intervals along the polymer chain.
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