Papers by Abdullahi Usman
The adsorption of unsuspected pollutant, an orgarno-phosphorus herbicide with the general name; g... more The adsorption of unsuspected pollutant, an orgarno-phosphorus herbicide with the general name; glyphosate, trade name; Roundupand chemically called 2-((phosphonomethyl) amino) acetic acid or N-(phosphonomethyl) glycine was qualitatively investigated. A batch adsorption mode was utilized as reactor in interacting herbicide solution with derived activated carbon. Results obtained from FTIR and GCMS run revealed the phenomenon likened to the adsorption of certain functional groups from the herbicide viz; NH- Amine (peak range of 3300-3500cm -1 ), polyoxyethyleneaminein glyphosate herbicides,CO Carbonyl groups (3412.19cm -1 peak region), OH-groups (3200-3600cm -1 peak region) and phosphonic moiety. On comparing the original herbicide spectral with those interacted with activated carbon, the functional groups common to both had different peaks information (denoting different peak heights, intensities and types of vibrations). This is an indication that there could be possibilities of ei...
Bookmarks Related papers MentionsView impact
With the stated advantages of finer adsorbent of high surface area, why then do manufacturers des... more With the stated advantages of finer adsorbent of high surface area, why then do manufacturers design unspecified active carbons of granular size even for the removal of medium size particles? This research attempt to provide one of such answers. A batch equilibrium adsorption study was carried out to assess the adsorption capacity and intensities of methyl red dye onto “Received ” Granular Activated Carbon (GAC) and “formulated ” Powdered Activated Carbon (PAC). The equilibrium data obtained were modeled using the Langmuir and Freundlich Isotherms. The data fitted best with the Langmuir model which was predicted by the highest R2 value (0.981). The experiment carried out demon-strated that GAC had a higher adsorption efficiency range of 33.4 % to 93.55 % and a high adsorption capacity of 1.176 mg/g. Generally, the research ascertained the reason why the manufacturer supplied the chosen adsorbent as “granulated particulate ” instead of “powdered ” as formulated for the purpose of thi...
Bookmarks Related papers MentionsView impact
Advances in Analytical Chemistry, 2016
Trichilia emetica seed oil was analysed for fatty acid profiles using GC-MS and proton nuclear ma... more Trichilia emetica seed oil was analysed for fatty acid profiles using GC-MS and proton nuclear magnetic resonance spectroscopy (1H-NMR). The percentage triacylglycerol conversion to its corresponding methyl esters was determined by 1H NMR and was calculated to be 94%. A total of six FAMEs were identified in the seed oil by the NIST library match software and the fragmentation pattern data of GC/MS. The results obtained from the two methods were 55% saturated (C14:0, C16:0, C18:0), 35% monounsaturated (C18:1) and 10 % polyunsaturated (C18:2 and C18:3). Generally, the 1H-NMR results were in good agreement with gas chromatographic (GC) analyses. In conclusion, the 1H-NMR-based procedures is fast as it does not require the oil to be derivatized and can be applied to neat T. emetica seed oil.
Bookmarks Related papers MentionsView impact
Trichilia emetica whole seeds were refluxed in water for twenty minutes and the extract subjected... more Trichilia emetica whole seeds were refluxed in water for twenty minutes and the extract subjected to column chromatography and preparative-TLC. The mass spectrum of the isolated compound in positive ion mode showed a parent molecular ion peak at m/z 291 which corresponds to the molecular formula C15H15O6. The structure was established on the basis of nuclear magnetic resonance (NMR), and Infrared (IR) spectroscopy, ultraviolet-visible (UV-vis) spectrophotometry as well as by the comparison of the data reported in the literature. It was concluded that the compound isolated is a biologically important polyphenol, (-)- epicatechin.
Bookmarks Related papers MentionsView impact
American Scientific Research Journal for Engineering, Technology, and Sciences, 2016
Taxifolin was isolated from the boiled water extract of Trichilia emetica whole seeds. The struct... more Taxifolin was isolated from the boiled water extract of Trichilia emetica whole seeds. The structure was determined by IR, 1 H and 13 C NMR and mass spectroscopic methods, as well as comparison of the data obtained with that reported in the literature.
Bookmarks Related papers MentionsView impact
Azadirachta indica (neem), belonging to Meliaceae family and native to Asia, has been used therap... more Azadirachta indica (neem), belonging to Meliaceae family and native to Asia, has been used therapeutically in traditional Ayurveda, Unani, several local systems within Africa and Chinese medicine to treat different diseases for long times. The phytochemical screening of the seed oil of these plants grown in Nigeria resulted in the isolation of nimbin from the methanol soluble fraction of the hexane extract. The structure of this compound was established on the basis of nuclear magnetic resonance (NMR), Infrared (IR) and mass (MS) spectroscopy. The obtained 1H and 13C NMR data of the compound was compared with those reported already in the literature. Finally, the identity of the compound was further substantiated by employing the X-ray crystallography. The compound was also subjected to antioxidant, antibacterial and brine shrimp lethality bioassay for further analyses. The pure compound showed poor antioxidant activity and was only moderately active against Escherichia coli among a...
Bookmarks Related papers MentionsView impact
The formation of fatty acid methyl esters from Trichilia emetica shell oil by trans-esterificatio... more The formation of fatty acid methyl esters from Trichilia emetica shell oil by trans-esterification with methanol was monitored by 1 H nuclear magnetic resonance spectroscopy. The percentage triacylglycerol conversion to its corresponding methyl esters was calculated to be 98 %. A total of five fatty acid methyl esters (FAMEs) were identified in the oil sample by the retention time and the fragmentation pattern data of GC/MS analysis. The identified FAMEs were hexadecanoic (palmitic), octadecanoic (stearic), eicosanoic (arachidic), 9,12-octadecadienoic (linoleic) and 9,12,15-octadecatrienoic (linolenic) acid methyl ester.
Bookmarks Related papers MentionsView impact
Trichilia emetica (Vahl) seed oil has a wide folk medicinal usage in Africa. The aim of this stud... more Trichilia emetica (Vahl) seed oil has a wide folk medicinal usage in Africa. The aim of this study was to phytochemically investigate the unsaponifiable portion of Trichilia emetica seed oil. The portion was subjected to repeated column chromatography and preparative thin layer chromatography (PTLC) using hexane, chloroform, ethyl acetate and methanol. Final purification was achieved using an isocratic gradient elution of CHCl 3 and CH 3 CN at a ratio of 3 to 1, in Reveleris Flash System fitted with C18 column. The structure of the isolated compound was elucidated on the basis of high resolution mass spectrometry as well as 1D and 2D NMR spectroscopic data analysis. Also, by direct comparison of the data obtained with those reported in the literature. It was then resolved that the compound isolated was stigmasterol, a steroid present in plant fats or oils. This compound has not been previously reported from this species.
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Bookmarks Related papers MentionsView impact
Journal of Natural Products and Resources
Bookmarks Related papers MentionsView impact
Journal of Encapsulation and Adsorption Sciences, 2011
Bookmarks Related papers MentionsView impact
Journal of Environmental Protection, 2012
Bookmarks Related papers MentionsView impact
Advances in Analytical Chemistry of Scientific & Academic Publishing, 2012
Bookmarks Related papers MentionsView impact
Uploads
Papers by Abdullahi Usman