Browsing by Author "Owalude, S.O."

Now showing 1 - 6 of 6
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    Kinetic and thermodynamic studies of glucose oxidase catalysed oxidation reaction of glucose
    (World Bank Assisted Nationally Coordinated Research Programmes (NCRP), National Agricultural Research Programme (NARP)-University of Port Harcourt, 2007-12-14) Odebunmi, E.O.; Owalude, S.O.
    The kinetics of oxidation of D-glucose catalysed by the enzyme glucose oxidase has been studied over a wide range of experimental conditions. The reaction velocities increased with increase in the concentrations of the glucose oxidase and glucose, as well as increase in temperature and ionic strength of the solution. The reaction velocity initially increased with increase in pH, reaching a maximum at pH 6.5 and then decreased with further increase in pH. The reaction exhibited saturation kinetics and experimental data were analysed using the Michaelis-Menten equation. Arrhenius activation energy and thermodynamic activation parameters were measured and are reported. The large negative value of entropy of activation, ΔS≠, -148.8 JK-1mol-1, and positive value of the enthalpy of activation, ΔH≠, 26.3 kJmol-1, give further support to the proposed mechanism. The results are interpreted in terms of a mechanism involving both an oxidative half reaction and a reductive half reaction.
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    Kinetics and Mechanism of Oxidation of Some Simple Reducing Sugars by Permanganate Ion in Alkaline Medium
    (Iranian Chemical Society, 2008-12-04) Odebunmi, E.O.; Owalude, S.O.
    The kinetics of oxidation of glucose, galactose, fructose, maltose and sucrose by alkaline permanganate anion has been studied. The reactions studied spectrophotometrically over a wide range of experimental conditions show that the rate of the reactions is enhanced by increase in pH, ionic strength, and temperature as well as the reactant concentrations. The mechanism has been proposed to proceed via the formation of enediol intermediate complexes and the order of reactivities of the sugars is fructose > glucose ≈ galactose > maltose > sucrose. The activation parameters were evaluated and lend further support to the proposed mechanism.
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    Photocatalytic degradation of alizarin red dye in aqueous solution using titania-nickel and titania-cobalt nanocomposites
    (Obafemi Awolowo University, Ife, Nigeria, 2018-03-15) Odeyemi, O.T.; Owalude, S.O.; Odebunmi, E.O.
    Titanium dioxide (TiO ) was prepared by Sol-gel method which involved hydrolysis of Titanium trichloride (TiCl3) with concentrated hydrochloric acid and oxidation by hydrogen peroxide. Doping of the TiO2 was effected at 10% Ni-TiO2 and 10% Co-TiO2 using aqueous solutions of nickel nitrate and cobalt nitrate respectively. Characterization by X-ray Diffraction Crystallography (XRD) and Scanning Electron Microscopy (SEM) showed that the surface area and crystallinity of TiO2 increased through doping. The XRD and SEM data confirmed the observed increase in the photocatalytic activities of the doped versus the undoped TiO2 photocatalysts. Photocatalytic activities of both the doped and undoped TiO was investigated on the 2 o photodegradation of Alizarin red dye. With a constant dye concentration of 25 ppm and temperature of 40 C, it was observed that for all varying concentrations except 0.25 g/l of catalyst at 240 mins, the percentage degradation was of the order TiO < Co-TiO < Ni-TiO . At the 0.25 g/l concentration of catalyst at 240 mins, 2 2 2 the photocatalytic activities of the Ni-TiO and Co-TiO were observed respectively to be about 9 times and 12 2 2 times that of the TiO .
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    Synthesis and characterization of new unsymmetrical bis-Schiff bases
    (Faculty of Science, University of Ilorin, 2018-07-10) Owalude, S.O.; AbdulRaheem, A.M.O.; Alemika, D.Y.; Tella, A. C.
    The literature is replete with symmetrical tetradentate bis-Schiff bases of 1,2-diamines with o-hydroxyaldehyde or ketones, but less attention has been focused on the analogous unsymmetrical tetradentate ones. Unsymmetrical Schiff bases of aromatic diamines are very difficult to obtain and are not easily isolated. This class of Schiff bases have very simple synthetic procedure and versatile coordination behavior. Metal complexes containing these Schiff bases in their structure usually possess exceptional antibacterial, antifungal and antitumor activities including anti-HIV activity. In this regard, two new unsymmetrical bis-Schiff bases, (Z)-N-(2-nitrophenyl)-N'-(2-((Z)-(2-oxoindolin-3-ylidene)amino)phenyl)acetimidamide (1) and (Z)-N-(2-nitrophenyl)-N'-((Z)-N-(2-oxoindolin-3-ylidene)carbamimidoyl)acetimidamide (2), were prepared from the condensation reactions of 2’-nitroacetanilide and 1H-indole-2,3-dione with o-phenylenediamine and guanidinium ions in ethanol. The corresponding symmetrical bis-Schiff bases (Z,Z)-1,3-bis(2-oxoindolin-3-ylidene)guanidine (3) and N-((2-(1-iminoethyl)-2-(2-nitrophenyl)hydrazinyl)methyl)-N-(2-nitrophenyl)acetimidamide (4) were also prepared. The data obtained from the elemental, IR and NMR spectroscopic analyses were used to propose structures for the four compounds.
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    The synthesis of some organotin (IV) compounds in the melt-phase
    (Islamic Azad University, Arak Branch, Arak, Islamic Republic of Iran, 2010-10-28) Eke, U. B.; Abodunrin, T.O.; Owalude, S.O.
    The melt-phase synthesis of dioctyltin (IV) and triphenyltin (IV) benzoates were carried out using stoichiometric amounts of benzoic acids and the corresponding organotin (IV) compounds. The reagents were ground together in a mortar and fed into a boiling glass tube. A cannula tube was inserted into the boiling tube to discharge accumulated gaseous products. A syringe ensured a continuous flow of dry Nitrogen gas in the reaction vessel. The compounds are known using wet Chemistry. Their syntheses via the melt-phase were in good yields. The physical properties corresponded to those of the similar compounds prepared by wet chemistry. The IR, 1H and 13C NMR data indicate that coordination to the tin atom is via carboxylate group.
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    Transesterification Reaction of Palm Kernel Oil (PKO) on a Bed of Crushed Cashew Nut Shell (CCNS)
    (Usmanu Danfodiyo University, Sokoto, Nigeria, 2019-06-04) Eke, U. B.; Owalude, S.O.; Tella, A.C.; Adejoro, A.G.
    Biodiesel (GA1) was produced by the transesterification reaction of palm kernel oil (PKO) and methanol catalysed by crushed cashew nut shaft. Biodiesel samples GA2 – GA4 were also produced from the palm kernel oil using conventional base catalysis by NaOH and crushed cashew nut shaft combined with NaOH. The physico-chemical properties and spectroscopic data of the four samples were found to be similar and compared favourably to those of standard biodiesel.