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Articles by E.K. Okoh
Total Records ( 3 ) for E.K. Okoh
  A.O. Ogunfowokan , E.K. Okoh , A.A. Adenuga and O.I. Asubiojo
  The treatment performance of the sewage treatment oxidation pond of a Nigerian University was assessed in terms of pH, electrical conductivity, biochemical oxygen demand (BOD5) and nutrient removal from the influent. These parameters were simultaneously monitored in the receiving stream, influent and effluents. Significant pollution of the receiving stream was indicated for BOD5, nitrate, phosphate, suspended solids and pH. The levels of these parameters in the sewage effluent exceeded the Nigerian Federal Environmental Protection Agency tolerance limits for the effluents to be discharged through public sewers into a stream. In addition, the levels of some trace metals: Pb, Fe, Mn, Zn and Cd were also determined in the influent, effluent of the oxidation pond and the receiving stream. High mean levels of Pb, Zn and Fe were observed in the receiving stream and exceeded the WHO guideline levels for drinking water and for protection of aquatic ecosystem. This unfortunately, may affect the `health` of the aquatic ecosystem in the receiving stream and the health of the rural dwellers who use the stream water directly for domestic purposes without treatment.
  M.A. Aderogba , E.K. Okoh , T.A. Adelanwa and E.M. Obuotor
  In this study a comparative antioxidant activity of the leaf extracts of P. reticulatum and P. thonningii have been evaluated using the DPPH free radical scavenging assay. The butanol fraction of P. reticulatum exhibited the highest activity (EC50 = 10.27 ± 0.02 μ g mL-1), while crude extract of P. thoninngii had the least activity (EC50 = 50.94 ± 0.27 μ g mL-1). These results suggested strong antioxidant activity potentials of the plants but less than ascorbic acid.
  M.A. Aderogba , E.K. Okoh and T.O. Idowu
  The ethyl acetate extract of Piliostigma reticulatum leaves was investigated for its antioxidant constituents. Isolated secondary metabolites of the leaves extract include: 2-O-(p-hydroxyphenyl)-5-hydroxy-6-C-methyl-7-methoxychromone (piliostigmin) 1, 6-C- methylkaempferol- 3-methyl ether 2, quercetin 3, quercetrin (quercetin-3-O-rhamnose) 4, and Isoquercetrin (quercetin-3-O-glucoside) 5. These compounds were evaluated for their antioxidant potentials. A rapid test for antioxidants using DPPH (1,1-dipheny-2-picryhydrazyl) TLC screening, demonstrated considerable radical scavenging activity for all the compounds. The DPPH spectrophotometric method was employed for quantitative determination of radical scavenging activity. The activity was expressed as EC50 value, which ranges between 4.68±0.03 and 50.76±1.71 for the flavonoids constituent.
 
 
 
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