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Articles by G. Otuchristian
Total Records ( 2 ) for G. Otuchristian
  N.A. Obasi , U.C. Okorie , B.N. Enemchukwu , S.S. Ogundapo and G. Otuchristian
  The numerous ethno-medicinal applications of Picralima nitida plants have called for a high thorough-put investigation of all the parts of the plant including the peel that is usually discarded in order to ensure maximum utilization of the plant. In this study, nutritional evaluation, phytochemical screening and antimicrobial effects of Picralima nitida peel were carried out using standard methods, in order to determine the potentials of this discarded part of the plant. The results of proximate contents indicated the following: moisture (49.6%), ash (16.0%), crude fibre (10.5%), crude lipid (7.4%), crude protein (28.4%) and carbohydrate (37.7%) while its calorific value is 265.8 kcal/100 g. Thus, the nutritional value of Picralima nitida peel is high and as such it could be used as feed additives. The results of phytochemical screening revealed the presence of flavonoids, saponins, tannins and alkaloids and the aqueous extract had antimicrobial activities against Escherichia coli and staphylococcus aureus with varying degrees. The most potent inhibitory effect was observed with Escherichia coli. These results have revealed that the peel and its extracts have pharmacological active compounds and antibacterial effects and as such could be used in ethno-medicine for the treatment of microbial infection and other ailments.
  A.I. Ezeribe , C.J. Chukwu , N.A. Obasi , G. Otuchristian and U.A. Ibiam
  Synthesis of mono through hexa substituted derivatives of Methylol Melamine Resins (MFR) were carried out at various catalyst (KH2PO4) concentrations of 0.5, 0.75, 1.0, 1.25 and 1.50 g. Rheological/mechanical properties of resin-cotton network were investigated to determine the effect of catalyst concentration and degree of substitution of resins on the flow property such as viscosity. Other parameters determined include percentage yield, breaking load and crease recovery properties of resinated cotton fabric. The result revealed that the yield increased with increase in catalyst concentration and attained the highest yield of 53.7% at 0.75 g and 51.3% at 1.0 g, respectively. The damaging effects of high acid concentrations were observed particularly at 1.25 and 1.50 g KH2PO4. Yield increased as the degree of substitution increased with hexa substitution having 48.8 and 53.7% at 0.5 and 0.75 g, respectively. Shear viscosity increased as catalyst concentration increased from 0.5 to 1.0 g with hexa and penta substitution giving the highest shear viscosity of 45 poises and 35 poises, respectively. The dry crease recovery angle increased with increased catalyst concentration up to 0.75 g and attained maximum value of 125° and 115° in the warp and weft directions, respectively at 150°C. The effect of catalyst on breaking load of sample at 150°C showed an increase from 0.5-1.0 g of catalyst concentration. The highest tear strength of 10.8 and 10.2 kgf at 0.75 g catalyst concentration was observed in the warp and weft directions, respectively. Acid damage at higher concentration was also implicated for the reduced tear strength.
 
 
 
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