November 2012
Comparative assessment of picolinic acid with common chemical preservatives in ginger juice during storage
In consideration of the medicinal and health benefit of picolinic acid (PA), this research work compared its effectiveness as a preservative with potassium sorbate and sodium benzoate in ginger juice. Concentration of 0.07, 0.067 and 0.073% of PA, potassium sorbate and sodium benzoate, respectively, were added to ginger juice, packed in polyethylene terephthalate (PET) bottles and stored for 12 weeks at ambient...
November 2012
Chemical composition and antimicrobial activity of the seed oil of Entandrophragma angolense (Welw) C.DC.
The seed of Entandrophragma angolense yielded 59% oil (w/w) on extraction with n-hexane. Methylation and gas chromatography-mass spectrometry (GC-MS) analysis of the methylated seed oil of E. angolense gave 11-octadecanoic acid methyl ester as major component (43.2%). Other fatty acid methyl esters (FAMEs) detected were hexadecanoic acid methyl ester, ricinoleic acid methyl ester, stearic acid methyl...
November 2012
Distribution and temporal variation of selected heavy metals in sediment of River Osara mainstream drainage in North Central Nigeria
The concentration levels of selected iron-ore composite heavy metals were investigated in mainstream sediment of River Osara traversing by Itakpe iron-ore deposit and mining area in North Central Nigeria. The sediment samples collected along the drainage course, up-, mid- and downstream for 24 months were digested using standard methods, and levels of Cd, Cr, Ni, Cu and Pb determined using flame atomic absorption...
November 2012
Extraction of mercury (II) from sample water by Schiff base-chitosan grafted multi-walled carbon nanotubes
A functionalized Schiff base-chitosan-grafted multi-walled carbon nanotubes (S-CS-MWCNTs) material has been studied on pre-concentration and determination of trace mercury. In this process, the effects of solution pH solution, elution conditions on pre-concentration of trace mercury were studied and the effect of interfering ions was also investigated. A novel S-CS-MWCNTs solid-phase extraction adsorbent was synthesized...
November 2011
Complexes of Nile Red and b- or g-cyclodextrin: A semiempirical-density functional theory-molecular dynamics route
The association of Nile Red (NR) with b-, and g-cyclodextrins (CDs) was analyzed by semiempirical parametric method 3 (PM3), density functional theory-Becke, three-parameter, Lee-Yang-Parr hybrid functional (DFT-B3LYP/6-31G), and molecular dynamics (MD) and Langevin dynamics (LD) calculations, including annealing and molecular mechanics (MM) geometry optimization. Our results suggest that inclusion complexes...
November 2012
Quantitative evaluation of the antipsoriatic activity of sausage tree (Kigelia africana)
The antipsoriatic effect of methanol and hexane extracts of the stem, bark, leaves and fruit of Kigelia africana (sausage tree) on cell differentiation was evaluated in the modified mouse tail test for psoriasis. Histopathological studies showed that the topical application of K. africana extracts on the tails of male albino mice-induced orthokeratosis in previously parakeratotic areas of the adult...
November 2012
Groundwater quality around new cement factory, Ibese, Ogun State, Southwest Nigeria
Assessment of physicochemical parameters and trace metals were carried out in groundwater of Ibese town and environs, Southwest Nigeria. The mean value of pH, electrical conductivity (EC), total dissolved solid (TDS) and alkalinity (HCO32-) are 5.90 ± 0.32, 1328.00 ± 676.26 µScm-1, 664.00 ± 353.58 mgL-1 and 94.00 ± 18.55 mgL-1. The chloride concentration was found to be higher than...
November 2012
Nitrate anion levels in water from selected wells and points along Kimondi River, Nandi
This paper focuses on the comparative determination of nitrate anion concentration from selected wells and points along the Kimondi River using UV-Visible spectrophotometric method. The areas monitored were Tulon, Sitatunga swamp, Sironoi, Kimondi Bridge, kipchabo tea factory and Samoo. This research was to determine whether nitrate anions in water are beyond the threshold limit which is harmful to both plant and animal...
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