Browsing by Author "Agwaramgbo, Lovell"

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    Antioxidant activity and phenolic content of Okoubaka aubrevillei (Anunuebe) fruit pychnobotrya nitida (Osu) leaf extracts
    (David Publishing, 2022) Alisa, Christopher O.; Okoye, Edith N.; Okeke, Peter C.; Anyadogh-Nwadike, Sylvia O.; Agwaramgbo, Lovell; Doyle, Jailen
    The antioxidant activity and the total phenolic content of Okoubaka aubrevillei (Anunuebe) and Pychnobotrya nitida (Osu) plant extracts were investigated in this study to justify their ethno medicinal importance. The antioxidant activity of crude extracts of both plants was investigated using the scavenging effect on DPPH (2, 2-Diphenyl-1-Picrylhydrazyl Radical) assay, while the total phenolic content was determined by the Folin-Ciocalteu reagent method. When compared to standard drug vitamin C at various concentrations, both extracts exhibited potent antioxidant activity that increased with increasing concentration of extracts. The high positive linear correlation between the antioxidant capacity and the total phenolic content suggests that the antioxidant capacity of both plants can be largely attributed to their phenolic compounds. Based on these findings, O. aubrevillei fruit and P. nitida leaf could be potential natural antioxidant sources for preventing free radical-induced diseases.
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    Emissions of gasoline combustion by products in automotive exhausts
    (U. P., 2016-04) Nkwoada, Amarachi; Oguzie, Emeka; Alisa, Christopher; Agwaramgbo, Lovell; Enenebeaku, Conrad
    Increased gasoline consumption in automotive engines have triggered the emissions of greenhouse gases (GHG) especially carbon dioxide (CO2) from automotive exhausts. These exhaust emissions depend on factors like the engine combustion design and operating conditions, fuel grade and lubricant, the state of maintenance and local road conditions and continue to affect the concentration of pollutants emitted by automotives like CO2 and unburnt hydrocarbons which are very toxic to humans, leading to environmental pollution. In pursuant of improved efficient engine and less toxic emissions, the use of gasoline blends and biofuels are not the panacea since the exhaust-gas concentration and its constituent are not indicative of the contribution of the constituent to the overall emission due to variations in exhaust-gas flow rate with different engine types and automotive sources. Moreover real-time monitoring, turbocharging technologies, fuel injection strategies and catalytic exhaust aftertreatment may reduce emissions if compared to base engines but significant risk of CO2 induced climate change continue to persist, while CO2 capture technologies such as adsorption and absorption are limited in contrast to new developments in engine and exhaust technologies that are cheaper and locally sourced and could become the next trajectory.
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    Examining adsorbent charge effect on metal removal from contaminated water
    (David Publishing, 2022) Agwaramgbo, Lovell; Alisa, Christopher O.; Doyle, Jailen
    Heavy metal contaminated water sources can cause serious health problems for humans, animals, and plants. Heavy metals can lead to the decrease or loss of liver, kidney, and brain function. Objective: The aim of this research is to examine the effect of charge on adsorbents in the removal of metal cations. Study Design & Methods: Standard solutions of Ca, Cu, Pb, and Zn with concentrations of 1,000 ppm were treated with sodium carbonate and sodium phosphate with various charges. Then, the solutions were placed on a shaker for 24 h, centrifuged, and the supernatant was analyzed using ICP-AES (Inductively Coupled Plasma-Atomic Emission Spectrometry). Results: The order of average metal removal by sodium phosphates is: dibasic (99.3%) > monobasic (96.5%) > tribasic (95.4%). The average metal removal by sodium carbonate and bicarbonate is 98.5% and 96.4% respectively. Conclusion: The adsorbent removability depends on the relationship between the charge present on the metal and the charge on the adsorbent. Thus, metal cations in this study with a +2 charge had a greater affinity for the adsorbent with -2 charged ligands, dibasic sodium phosphate and sodium carbonate.