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Articles by I.O. Igwenyi
Total Records ( 2 ) for I.O. Igwenyi
  I.O. Igwenyi , C.E. Offor , P.M. Aja , G.S. Aloh , O.U. Orji and C.A. Afiukwa
  Vegetable oils are combustible materials of organic origin and have potentials for use as biodiesel. The potential of extractable vegetable oil from Afzelia africana in the production of biodiesel was investigated and its fuel properties were evaluated by the assessment of the physicochemical properties. Standard official methods were employed in extraction and characterization of oil from Afzelia africana (African oak) seed and it was found that it contained 18.50% crude lipid content on dry weight basis with a very high percentage of total fatty matter and a refractive index of 1.47 at 40°C. The acid value 4.49% was low in the oil sample while the peroxide value 6.40 meq g-1 was indicative of very low level of hydroperoxides which could initiate or propagate further oxidation of the oil, thereby improving the stability (oxidative stability) of the oils. The saponification value was 229.12 mg KOH g-1 while the iodine value indicates that the oil was non-drying and non volatile at room temperature. The value of the Cetane index was 55 and the estimated value of the heat of combustion revealed that burning the vegetable oil in a diesel engine will yield about 9209.45 cal g-1. The fatty acid distribution in the seeds of Afzelia africana expressed as the percentage area of fatty acid methyl esters composition revealed lauric acid 0.69%, myristic acid 1.54, palmitic acid 33.45%, stearic acid 6.97%, oleic acid 12.25% and linoleic acid 41.25%, showing that the seed oil was predominantly composed of palmitic acid and oleic acid families. This result showed that the oil would be stable on exposure to atmospheric oxygen during storage and use. This stability is further confirmed by the low level of free fatty acids.
  K.N. Agbafor , P.M. Ajah , C.E. Offor , I.O. Igwenyi and U.A. Ibiam
  This study was aimed at investigating the effect of water and salt samples from Okposi and Uburu salt lakes on some serum trace elements and the cardiovascular system. Serum levels of copper (Cu), cadmium (Cd), cobalt (Co) manganese (Mn), cardiac troponin I (cTnI) and lipid profile were measured in albino rats after treating them with different doses of salt and water from the lakes for seven consecutive days. Average body weight, physical activities and food and intake decreased in all the treated groups compared with the control. The levels of Cu, Cd, Co and Mn in test groups were significantly higher (p<0.05) than in the control. There was a significant increase (p<0.05) in the concentrations of cardiac troponin I, cholesterol, triacylglycerol and low density lipoproteins, in the treated groups relative to the control while high density lipoproteins in the control were significantly higher (p<0.05) than the treated groups. The observations were also statistically more pronounced (p<0.05) in the groups given water samples than those administered salt samples. The differences in the levels of these parameters between groups given Okposi samples and those treated with Uburu samples were not significant (p>0.05). The effects of the samples were found to be dose- dependent. These results indicate that the samples may be toxic to the cardiovascular system and this toxicity may be reduced by the methods of processing the salt. The toxicity of the samples may be due to the chemical contents of the lakes.
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