African Journal of
Pure and Applied Chemistry

  • Abbreviation: Afr. J. Pure Appl. Chem.
  • Language: English
  • ISSN: 1996-0840
  • DOI: 10.5897/AJPAC
  • Start Year: 2007
  • Published Articles: 357

AJPAC Articles

The potential of binary blended geopolymer binder containing Ijero-Ekiti calcined kaolin clay and ground waste window glass

July 2015

The aim of this study was to investigate alkaline reactivity potentials of calcined clay and ground waste window glass with NaOH/Na2SiO3 solution to form geopolymer, an inorganic binder. A calcined clay (CC) sourced from Ijero-Ekiti, Nigeria, was replaced by various proportions (0, 25, 50 and 75%) of ground waste window glass (GWWG) and subjected to alkaline activation by NaOH/Na2SiO3 solution. X-ray florescence (XRF)...

Author(s): Mary Bosede Ogundiran and Festus Abodunde Winjobi

A study of the morphology and optical properties of electro polished steel in the presence of Vitamin-C

June 2015

The studies of steel electrochemical polishing Electropolishing (EP) in orthophoshoric acid were performed by potentiodynamic polarization. Electropolishing was conducted in solution containing Vitamin C. Addition of Vitamin C to electropolishing solution results in a lower limiting current. Vitamin C concentration influence on electropolishing process and surface texture (AFM, SEM) and UV-VIS-NIR Spectroscopy was...

Author(s): Fatma M. Abouzeid

Inhibitive and adsorptive effect of Parinari polyandra on mild steel corrosion in aqueous sulphuric acid

June 2015

The inhibition of mild steel corrosion in 0.5 M sulphuric acid solution by ethanol extracts of Parinari polyandra as an eco-friendly inhibitor was studied at different temperatures by weight loss technique and linear polarization. The test plant extracts has a promising inhibitory action against corrosion of mild steel in the sulphuric acid media. The inhibition efficiencies increase with a corresponding increase in the...

Author(s): F. E. Awe, S. O. Idris, M. Abdulwahab and E. E. Oguzie

Unexpected mixed valence iron(II, III) µ3-oxo furfuryl complex with wheel motif isolated when preparing iron(II) arene complexes

June 2015

A series of new compounds including 2-({[(4-(propoan-2-yl)benzyl]Oxy}methyl)tetrahydrofuran ligand were tested in order to link auxiliary and labile ligands to iron arene complexes. The given reaction of benzyletherfurane ligand with Fe (II) sources resulted to the isolation of unexpected mixed valence µ3-oxo-Fe6IIFeIII compound, which has been fully characterized by x-ray crystallography. The resulting complex...

Author(s): Roger Mafua, and Jean-Luc Débieux

Accessing the potential of Lonchocarpus laxiflorus roots (LLR) plant biomass to remove Cadmium (II) ions from aqueous solutions: Equilibrium and kinetic studies

May 2015

The potential of Lonchocarpus laxiflorus roots (LLR) for the removal of Cd (II) ions from aqueous solutions has been investigated. The adsorption of Cd (II) ions was found to be affected by solution pH, contact time, adsorbent dosage, initial metal ion concentration, and temperature. The equilibrium was analysed using Langmuir and Freundlich isotherm models. The data was found to have a closer correlation with the...

Author(s): A. H. Santuraki and A. A. Muazu

Evaluation of anti-oxidant properties in essential oil and solvent extracts from Tagetes minuta

May 2015

Synthetic antioxidants such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) are toxic and carcinogenic, thus they induce DNA damage. This calls for the need to find alternative antioxidants from natural products. Tagetes minuta (Asteraceae) is an annual herb that belongs to the Asteraceae family. It is used in common medicine and grows in temperate regions of South America, some parts of Africa and...

Author(s): Kyarimpa Christine, Isaiah Ndiege Omolo, John David Kabasa, Christine Betty Nagawa, John Wasswa and Cliff Richard Kikawa

Phytochemical composition, antioxidant and anti-nutritional properties of root-bark and leaf methanol extracts of Senna alata L. grown in Nigeria

May 2015

Senna alata L. has been ethnobotanically used extensively in traditional medicines for the treatment of a variety of diseases such as skin problems, arthritis, HBP (high blood pressure), and laxative or purgative. The phytochemical, anti-nutritive and antioxidant activities of the leaf and root bark of Senna alata L. grown in Bida Niger State, Nigeria were determined using standard analytical methods. Phytochemical...

Author(s): Abubakar I., Mann A. and Mathew J. T.

Determination of phenylethyl alcohol by reversed-phase high-performance liquid chromatography (RP-HPLC) in Budesonide nasal spray

May 2015

Phenylethyl alcohol is used as an antimicrobial preservative in many pharmaceutical products, especially nasal sprays. A simple and accurate reverse phase high performance liquid chromatographic method was developed to assay of phenylethyl alcohol in budesonide nasal spray preparations. A waters C18 symmetry column chromatographic system (150 × 4.6 mm, 5 µm particle size) was performed with a 50:50 (%V/V)...

Author(s): Reza Hosseini, Fereshteh Naderi and Saman Ahmad Nasrollahi

Reversal of plasticity of acid leached kaolinitic clays from Mukurwe-ini

April 2015

This study aimed at finding out whether the property of plasticity of acid leached clays can be reversed by treatment with a suitable base. Studies were carried out on representative samples, which were taken from iron bearing clays from Mukurwe-ini, Nyeri County in Kenya (Latitude 00°34´00´´S, Longitude 37°03´00´´E). Characterization of the clay was done in its natural form,...

Author(s): Dickson Andala and Wachira David Maina

Oxidation of acha (Digitaria exilis) starch using 3.5% active chlorine sodium hypochlorite

April 2015

Acha (Digitaria exilis) starch was chemically modified using sodium hypochlorite (3.5% active chlorine) as oxidative agent. The physicochemical properties of the native acha starch and oxidized derivative were investigated. Oxidation improved the water and oil absorption capacity of the native acha starch and also the emulsion capacity was significantly improved. The bulk density, foam capacity and solubility reduced...

Author(s): S. Isah, A. A. Oshodi and V. N. Atasie

Estimation of the refractive indices of some binary mixtures

April 2015

Refractive index is a useful fluid characterization parameter with widespread industrial applications. The values for many pure liquids are known or readily available in literature. However, when experimental data are not available, the refractive indices of binary and multi-component liquids are often estimated from the pure components using mixing rules which are sometimes not accurate. This study was designed to...

Author(s): Isehunwa S. O., Olanisebe E. B., Ajiboye O. O. and Akintola S. A.

Physiochemical characterisation and level of potentially toxic metals in surface water around yauri abattoir, north western Nigeria

March 2015

Physicochemical and potentially toxic metals statuses of surface water samples collected around the Yauri abattoir were examined. Health risk assessment of the toxicant via ingestion was interpreted by calculating the hazard quotient (HQ). The mean concentration values for total dissolved solid (TDS), total suspended solid (TSS), dissolved oxygen (DO), phosphate, and biochemical oxygen demand (BOD) were 1026.78, 565.22,...

Author(s): Yahaya M. I. and Agbendeh Z. M.

Efficiency enhancement in P3HT:PCBM blends using Squarylium III dye

March 2015

Nano-size thin films comprising poly (3-hexylthiophene) (P3HT) and a fullerene derivative [6, 6] phenyl-C61-butyric acid methyl ester (PCBM) incorporating squarylium dye III (SQ3) are reported. The materials prepared were evaluated for their optical, electrical and photo-conversion efficiency. Active layer materials comprising a blend of P3HT:SQ3:PCBM were deposited by spin-coating to produce thin films measuring 100 nm...

Author(s): M. Tembo, M. O. Munyati, S. Hatwaambo and M. Maaza

Corrosion and corrosion inhibition of cast Iron in hydrochloric acid (HCl) solution by cantaloupe (Cucumis melo) as green inhibitor

March 2015

The effect of cantaloupe juice and seed extracts on corrosion of cast iron in 1.0 M hydrochloric acid (HCl) solution using hydrogen evolution measurements (HEM) and mass loss measurements (MLM) were investigated. Cantaloupe extracts inhibited the corrosion of cast iron in 1.0 M HCl solution. The inhibition efficiency increased with concentration of the extracts. The adsorption of the inhibitor molecules on cast iron...

Author(s): Khadijah M. Emran, Arwa O. Al-Ahmadi, Bayan A. Torjoman, Najla M. Ahmed and Sara N. Sheekh

Extraction of silica gel from Sorghum bicolour (L.) moench bagasse ash

February 2015

Sweet sorghum (Sorghum bicolor (L.) moench), a crop that is grown by subsistence farmers in Zimbabwe was used to extract silica gel in order to assess its possible use as a raw material for the production of silica-based products. The gel was prepared from sodium silicate extracted from sweet sorghum bagasse ash by sodium hydroxide leaching. Results show that maximum yield can be obtained at pH 5 and with 3 M sodium...

Author(s): Mupa M., Hungwe C. B. , Witzleben S. , Mahamadi C. and Muchanyereyi N.

Multifactorial discriminant analysis of leaf oil of C. odorata L. King and Robinson from Côte d'Ivoire

February 2015

The chemical composition of 71 essential-oil samples isolated from the leaves of Chromolaena odorata harvested in eight Ivoirian sites (Toumodi, Dougba, Yamoussoukro, Zambakro, Toumbokro, Attiegbakro, Tiebissou and Tie-N’Diekro) was investigated by GC-FID, including the determination of retention indices (RIs), and by 13C-NMR analyses. In total, 31 components accounting for 55.5 - 90.2% of the oil composition were...

Author(s): Esse Leon Wognin, Affia Florence Brou, Thierry Acafou Yapi, Kidjegbo Augustin Touré, Tomi Félix and Zanahi Felix Tonzibo

A physico-chemical analysis of soil and selected fruits in one rehabilitated mined out site in the Sierra Rutile environs for the presence of heavy metals: Lead, Copper, Zinc, Chromium and Arsenic

February 2015

The accumulation of heavy metals in soils especially in mining environments is of increasing concern to researchers in the Agricultural Industry. This is because the metals are biomagnified by plants. Accumulation of heavy and trace metals in plants occur by various sources but soil is considered the major one. Consumption of vegetables and fruits containing heavy metals is one of the main ways in which these elements...

Author(s): P. O. Egbenda, F. Thullah and I. Kamara

Amino acid content, fatty acid content and anti nutritional factor of seeds of new hybrid varieties of Echinochloa frumentacea (Sanwa) minor millets

January 2015

Cereals are the staple diet of most of the world’s population. The millets are very important staple food in the rural parts of India. Millets can secure India’s food and farming in future because it is amazing in their nutrition contents. Echinochloa frumentacea (Sanwa) millet is good source of energy and provide protein, fatty acid, minerals, vitamins, dietary fibre and polypheonals. Proteins present in...

Author(s): S. Gupta, S. K. Shrivastava and M. shrivastava

Isolation and characterization of a steroidal compound from the hexane extract of the leaves of Artabotrys odoratissimus

January 2015

Artabotrys odoratissimus has been investigated by many workers for its constituents. Previous phytochemical studies have revealed this genus to be rich in secondary metabolites including phenylcoumarins, xanthones and triterpenoids. So far, not many studies have been carried out on this genus but there are some reports on this plant. Our recent study on the hexane extract  of  the  leaves  of...

Author(s): Faizan Danish Khaleel, B. K. Mehta and Darshina Mehta

Studies on phytochemical screening, antimicrobial and toxicity effect of the shoot system of Acalypha segetalis Müell. Arg.

December 2014

The dried and pulverized shoot system of Acalypha segetalis was extracted with hexane, ethyl acetate and methanol using cold extraction technique. The three extracts were subjected to phytochemical, toxicity and antibacterial screening. Phytochemical studies revealed the presence of alkaloids, flavonoids, saponins, tannins, phenols, glycosides, steroids and resins. The toxicity activity was investigated using brine...

Author(s): Aboaba, Sherifat A. and Yeye, Emmanuel

Anthocyanins from mulberry (Morus rubra) fruits as potential natural colour additives in yoghurt

December 2014

Colouring potential of anthocyanins from whole fruit juice of mulberry (Morus rubra) was studied in yoghurt. Whole fruit juice from M. rubra rich in non-acylated anthocyanins was incorporated into plain yoghurt (100 g) at increasing concentration levels of the juice; 10, 20, 25, 30, 40 and 50 mg cyanidin-3-glucopyranoside equivalents (cy-3-glu eqv) and stored under refrigerated condition (< 8°C) for two weeks....

Author(s): Robert Byamukama, Moses Andima, Angella Mbabazi and Bernard T. Kiremire

Water quality assessment of Manchar Lake during the month of August and November 2011 by analyzing selected trace elements

November 2014

Manchar Lake is the largest fresh water lake in Pakistan, situated in Jamshoro District. It was created in the 1930 when the Sukkur Barrage was constructed on the river Indus. It is a vast natural depression flanked by Khirthar range in the west, Lakhi hills in south and river Indus in the east. On the north eastern side is the protective embankment. The lake is fed by two canals, the Aral Wah and the Danister from the...

Author(s): Ghulam Murtaza Mastoi, Khalid Hussain Lashari, Zameer Ali Palh, Anila Naz Soomro, Zulfiqar Ali Laghari, Khalida Faryal Almani, Gul- e-Rana Abdul Waheed Mastoi and Abdul Rasool Abbasi

Synthesis, characterization and thermal analysis of the copper(II) complexes with 2,2'-bipyridyl and 1,10-phenanthroline

October 2014

The Cu(II) complexes were synthesized by the addition of Cu(II) acetate  monohydrate to ligand in aqueous solution with 1,10-phenanthroline and 2,2'-bipyridyl which led to the precipitation of  complexes. The synthesized Cu(II) complexes [Cu(SAla)phen(H2O)].H2O, [Cu(SAla)bpy(H2O)].H2O were found to be soluble in water, ethanol, methanol and DMSO. The electronic spectra and the magnetic moment support the...

Author(s): S. Chandraleka and G. Chandramohan

Adsorption of heavy metal ions onto chitosan grafted cocoa husk char

October 2014

The use of chitosan-grafted cocoa husk char (CCH) and unmodified cocoa husk char (CH) as adsorbents for the removal of Cr6+ and Pb2+ were studied. The adsorption efficiencies were compared with that of the commercial activated carbon (GAC F-300). Energy Dispersive X-ray spectroscopy (EDS) was used to determine the elemental compositions of the adsorbents while Scanning Electron Microscope (SEM) was used for the surface...

Author(s): Aderonke A. Okoya, Abimbola B. Akinyele, Ifeanyi E. Ofoezie, Omotayo S. Amuda, Oluwagbemiga S. Alayande and Oladotun W. Makinde

Effect of solvent type on the yields and mineral compositions of the leaf extracts of Moringa oleifera L.

September 2014

The present study was conducted for the leaves extract of Moringa oleifera L (Moringeaeae) in different solvents: Fermented maize marsh (Omidun /FMM), hot water (HW), cold water (CW), palm-wine (PW), ethanol, dichloromethane (DCM) and n-hexane to determine the effects of solvent properties on the extraction yields and the compositions of dietary minerals (k, Ca, Mg, Zn, Cu, and Fe) for M. oleifera. The observed yields...

Author(s): Adeoye, M. Dasola, Lawal,  A.Tunbosun, Azeez,  L. Adeyemi and Olayiwola, O. Abidemi

Kinetic and equilibrium studies of the heavy metal remediation potential of Helix pomentia

September 2014

Heavy metals are one of the major pollutants in water and are very toxic. However, chitosan – a waste biomass of agricultural products possess the ability to chelate heavy metals in water. In this study, the application of snail (Helix pomatia) shell based chitosan for remediating heavy metals contaminated Osun River (OSR), Odo-ebu stream (OBS) and Aso well water (AWW), all in Osogbo community, Nigeria;...

Author(s): Adeoye, Moriam Dasola, Azeez, Lukman Adeyemi, Lawal,  AbdulAzeez Tunbosun, Olayiwola, Olajumoke Abidemi and Shitta, Olanrewaju Razaq

Synthesis, spectroscopy and electrochemistry of 2-(mercapto/hydroxyl)pyridine-bis-{1-(alkyl)-2-(arylazo) imidazole}ruthenium(II)

August 2014

Ruthenium–pyridine complexes incorporating azoimidazole ligands, L, of the type [RuII(RaaiR´)2-(X-pyridine)] 1–6 [RaaiR/ = p-R-C6H4-N=N-C3H2-NN-1-R/, (1-6), abbreviated as N,N/-chelator, where N(imidazole) and N(azo) represent N and N/, respectively; R=H (a), Me (b), Cl (c) and R/ = Me (1,4), CH2CH3 (2,5), Bz(3,6), X=S, 2-mercaptopyridine(1-3), X=O, 2-hydroxy-pyridine(4-6)] have been synthesized and...

Author(s): Prithwiraj Byabartta,

Solvent effect and catalysis in the synthesis of thiosemicarbazone derivatives from ketones and 4’-phenylthiosemicarbazide

August 2014

In this paper, we performed a series of experiments aiming at establishing the solvent effects in the condensation of 4-phenylthiosemicarbazide with 4-nitroacetophenone to form the expected thiosemicarbazone derivative, reaction  which  was chosen  as pilot reaction, having in mind to set up optimal reaction conditions for the future elaboration of a compound library of thiosemicarbazone derivatives....

Author(s): Urbain C. Kasséhin, , Fernand A. Gbaguidi, Coco N. Kapanda, Christopher R. McCurdy and Jacques H. Poupaert

Prediction of substituent types and positions on skeleton of eudesmane-type sesquiterpenes using generalized regression neural network (GRNN)

July 2014

Sesquiterpenes are formed from countless biogenetic pathways and are therefore a constant challenge to spectroscopists in structure elucidation. In this study, we explore the ability of generalized regression neural network (GRNN), an architecture of artificial neural networks (ANNs), to predict the substituent types on eudesmanes, one of the most representative skeletons of sesquiterpenes. Carbon-13 (13C) nuclear...

Author(s): Alawode T. T. and Alawode K. O.

Dichloro-diphenyl-trichloroethane (DDT) residue levels in marketed Silver Fish (Rastreneobola argentea) caught from major water bodies in Uganda

June 2014

Silver fish (Rastreneobola argentea) samples from Lake Victoria and Lake Kyoga were analyzed for dichloro-diphenyl-trichloroethane (DDT) and metabolites using a Gas Chromatograph equipped with an Electron Capture Detector. Confirmation of results was by Gas Chromatography equipped with Mass Spectrophotometer (GC-MS). DDT and metabolites were detected in 90% of the total samples (63 out of 70). pp’ DDT was the most...

Author(s): Proscovia Nnamuyomba, Jolocam Mbabazi and Muhammad Ntale

Colour of starch-iodine complex as index of retrogradability of starch pastes

May 2014

Starch retrogradation is mainly due to the amylose fraction of starch. Amylose quantification is usually done by iodine staining with which it forms a blue colour complex while starch retrogradability can be monitored by freeze-thaw stability measurements. In this work, spectroscopic determination of the blue value and visual monitoring of starch–iodine colour complex were used to study starch retrogradation. The...

Author(s): Louis M. Nwokocha and Gabriel B. Ogunmola

Phytochemical screening of the leaf extracts of Hyptis spicigera plant

May 2014

The present study reports the screening of phytochemical constituents of the leaf extracts of Hyptis spicigera using hexane, ethylacetate and methanol and the leaf powder of the plant. Qualitative analysis of phytochemical constituents showed the presence of the following secondary metabolites vitannins, carbohydrates, saponins, flavonoids, steroids, alkaloids, quinones, coumarin, terpenoids, resins and cardiac...

Author(s): Z. Ladan, J. O. Amupitan, O. A. Oyewale, R. G. Ayo, E. Temple and E. O. Ladan

Determination of some heavy metals in selected edible vegetables grown along River Yedzaram in Uba area Adamawa State, Nigeria

April 2014

The levels of some heavy metals were investigated in selected edible potions of the vegetables; Amarathus caudatus (Spinach) and Hibiscus sabdariffa (Rosella) are grown in Uba area along the Yedzaram River in North Eastern Adamawa State, Nigeria. All samples were randomly collected from two different gardens. The levels of the heavy metals, (Cu, Fe, Cd, Cr and Zn) were analyzed using Atomic Absorption Spectrophotometer...

Author(s): Alexander P. and Ubandoma W. H.

1-Indanone chalcones and their 2,4-Dinitrophenylhydrazone derivatives: Synthesis, physicochemical properties and in vitro antibacterial activity

April 2014

Chalcones are natural biocides. Several publications appear every year covering the synthesis of chalcones because they exhibit an array of pharmacological activities. In this study, some condensation reactions of 1-Indanone with substituted benzaldehydes were carried out under different reaction conditions. The chalcone products were converted to their corresponding 2,4-Dinitrophenylhydrazone derivatives and evaluated...

Author(s): Olatomide A. Fadare, David A. Akinpelu, Henry Ejemubu and Craig A. Obafemi

Kinetics of the corrosion of mild steel in petroleum-water mixture using ethyl ester of lard as inhibitor

March 2014

Ethyl Esters of Pork Oil (EEL) has been investigated as a mild steel corrosion inhibitor in petroleum-water mixture by weight-loss tests at different concentrations (0.1l, 0.2, 0.3, 0.4 and 0.5g/L) of inhibitor, and at temperatures of 303, 313, 323 and 333K. Results show that inhibition efficiency increases as the inhibitor concentration increases, decreases with temperature, and follows the Langmuir adsorption...

Author(s): Jerome Anguel Undiandeye, Ternenge Joseph Chior, Abubakar Mohammed and Julius Chigozie Offurum

Substituent effects of 2-aryl-trans-decahydroquinolin-4-ones in CTADC oxidation: Spectrophotometric approach

March 2014

A kinetic study was carried out using spectrophotometric approach on the oxidation of nine differently substituted 2-aryl-trans-decahydroquinolin-4-ones by Cetyltrimethylammonium dichromate (CTADC) as oxidant at 30°C and in aqueous acetic acid (50%) containing catalytic amount of sulphuric acid (6N). The reactions were studied at 350 nm. The reaction was found to follow second order kinetics. The substitution of...

Author(s): Sharmila N., Rao R. S. C. , Hari Babu B., Trimurtulu G. and Satyanarayana P. V. V

Adsorption kinetics of 2-chloroacétophénone and 4-bromoacétophénone thiosemicarbazone on Oueme Valley clays (R. Benin)

March 2014

2-chloroacetophenone-thiosemicarbazone and 4-bromoacétophénone-thiosemicarbazone are compounds endowed with numerous pharmacological properties.  In order to produce therapeutic agents using clay as excipient, this paper deals with the absorption kinetics of a clay originating from Oueme valley in Benin. A prospection in this area gave rise to the collection of 4 samples classified according to their...

Author(s): Tadjou DO REGO, Serge Fredys Rodrigue O. SENOU, Fidèl DIMON, Salome KPOVIESSI, Alban HOUNGBEME, Coffi AZANDEGBE ENI, Georges C. ACCROMBESSI, Jacques POUPAERT and Fernand A. GBAGUIDI

Inhibitory action of Albizia zygia gum on mild steel corrosion in acid medium

February 2014

The corrosion and inhibition behaviours of mild steel in sulphuric acid in the presence of Albizia zygia gum (AZ) have been studied using the weight loss, gasometric, Fourier transform infrared (FTIR) and thermometric techniques. The temperature studies reflect that the percentage of inhibition efficiency is decreased with rise in temperature and that indicates the mechanism of physical adsorption. The calculated...

Author(s): Paul Ocheje Ameh

Phytochemical study on the benzene:acetone extract of the leaves of Artabotrys odoratissimus

February 2014

Artabotrys odoratissimus has been investigated by many workers for its constituents. The compounds so far isolated from the leaves of A. odoratissimus are Pentadecyl-7-hydroxy- dodecanote, Pentadecyltritriacontanonte, 4,5-epoxy -26-ol- dopentacontane, β-Sitosterol, Aplysterol, Nonacosanylhexaconsanoate, Pentatetraacont-19-ol, triacont-2-ol, Dotriacont-7-ene, Octacose-7-ene,...

Author(s): Faizan Danish Khaleel, S. M. Zuber, B. K. Mehta, Darshina Mehta and S. R. Kolisetty

Studies on urea treated rice milling waste and its application as animal feed

February 2014

The composition of urea treated rice milling waste and its application as animal feed was studied. The proximate analysis of the urea treated rice milling waste showed that it contained 94.90% dry matter, 10.38% crude protein, 5.89% crude fibre, 0.16% ether extract, 7.47% ash, and 54.81% nitrogen-free extracts. The untreated rice milling waste contained 94.34% dry matter, 9.11% crude protein, 6.37% crude fibre, 0.18%...

Author(s): Simon Terver Ubwa, James Abah, Barnabas Atsinafe Oshido and Esther Otokpa

Preconcentration of Cd(II) by chemically converted graphene sheets adsorbed on surfactant- coated C18 before determination by flame atomic absorption spectrometry (FAAS)

January 2014

A simple, highly sensitive, accurate and selective method for determination of trace amounts of Cd(II) in water samples is presented. A novel chemically converted graphene sheets (CCG) solid-phase extraction adsorbent was synthesized by CCG sheets. The stability of a CCG especially in concentrated hydrochloric acid was studied which used as a recycling and preconcentration reagent for further uses of CCG. The method is...

Author(s): Moghimi Ali and Farahmandjou Majid

Inhibition of mild steel corrosion using Juniperus plants as green inhibitior

January 2014

The corrosion inhibition of mild steel in H2SO4 solution in the presence of Juniperus  plant at a temperature range of 30 to 60°C was studied using chemical (HE and WL) and electrochemical (PDP and EIS) methods. The Juniperus plant acts as an inhibitor in the acid environment. The inhibition efficiency increases with increase in inhibitor concentration but decreases with an increase in temperature. The...

Author(s): Saedah R. Al-Mhyawi

Extraction and separation of Ni(II) from by functionalized graphene oxide with covalently linked porphyrin (GO–H2NP) adsorbed on surfactant coated C18

November 2013

A novel, simple, sensitive and effective method has been developed for preconcentration of Ni (II) on functionalized Graphene oxide with covalently linked porphyrin (GO–H2NP) solid-phase extraction adsorbent. The stability of a chemical (GO–H2NP), especially in concentrated hydrochloric acid, was then used as a recycling and pre-concentration reagent. The method is based on selective chelation of Ni(II) on...

Author(s): Ali Moghimi, Mahdi Alijanianzadeh and Rezvan Pourahmad

Microstructure contradistinction for indirect/direct desulfurization product layer of limestone particle in coal-fired flue gas

November 2013

The micro morphology of limestone sorbent is a key for improving the SO2 removal efficiency in the coal-fired power plant. The tube furnace system was built for imitating the indirect desulfurization reaction in traditional boiler atmosphere (65%N2, 15%CO2, 4.7%O2, 15%H2O, 0.3%SO2) and the direct desulfurization reaction in oxygen-fired atmosphere (80%CO2, 4.7%O2, 15%H2O, 0.3%SO2). The reacted limestone particle samples...

Author(s): Jian-yu Shang, Zhong-liang Liu and Chun-bo Wang

Didecanoate compound: Isolated from Momordica charantia Linn. seeds from Nigeria

November 2013

The seeds of Momordica charantia were extracted with hexane, ethyl acetate and 95% ethanol successively by percolation and concentrated at 37°C. Fractions 19-21 and 247 gave two compounds. However, only one has been elucidated to be 4a-phorbol-12, 13-didecanoate using the state- of –art- tools of spectrometry. The phytochemical screening of seeds of M. charantia showed the presence of...

Author(s): Oragwa Leonard N., Olajide Olutayo O., Efiom Otu O. and Okwute Simon K.

Corrosion inhibition of Aluminum in 1 M phosphoric acid solutions using some Chalcones derivatives and synergistic action with halide ions

November 2013

The purpose of this paper is to investigate the inhibition effect of some Chalcone derivatives on the corrosion behavior of aluminum in 1 M phosphoric acid solutions with and without Chalcone derivatives and to investigate the influence of halide additives namely: KCl, KBr and KI on the inhibition efficiency of aluminum. For this purpose, polarization (DC) and weight loss measurements were used. To increase the...

Author(s): A. S. Fouda, M. Abdallah and M. Eissa

Phytochemicals, anti-microbial and free radical scavenging activities of Momordica charantia Linn (Palisota Reichb) seeds

November 2013

Extractives from the seeds of Momordica charantia Linn were screened for phytochemical, antioxidant and anti-microbial activities against Escherichia coli, Candida albicans, Staphylococcus aureus, Staphylococcus epidedermis, Klebsiella pneumonia and Proteus mirabilis. The phytochemical screening of Momordica charantia seeds showed the presence of flavonoids, glycosides, sterols, fat and oil in hexane, ethyl acetate and...

Author(s): Oragwa Leonard N., Efiom Otu O. and Okwute Simon K.

Potentials of Nigerian calcined kaolin as paint pigment

November 2013

Pigment is one of the main components in paint formulation which is dominated with the use of titanium dioxide, due primarily to three important physical characteristics; which are high refractive index, high opacity and chemical inertness. However, due to increasing demand of this important pigment and the attendant increase in price, it has become imperative to develop cheaper alternative source with similar...

Author(s): Alabi F. M. and Omojola. M. O.

Status and distributions of pesticides buried at five sites in Arusha and Mbeya regions, Tanzania

November 2013

This study investigated the compositions and distributions of pesticides buried at five sites in Tanzania. Samples were collected from various depths up to 220 cm. The analytes in samples were extracted by pressurized fluid extraction. Labelled internal standards were used for identification and quantification. Clean-up of extracts was conducted by using column chromatographic techniques. Determination of the analytes...

Author(s): John A. M.  Mahugija

Aqueous extract of propolis as corrosion inhibitor for carbon steel in aqueous solutions

October 2013

  The inhibition efficiency of aqueous extract of propolis on the corrosion of carbon steel in 35 ppm aluminum sulfate and 10 ppm chloride solution was investigated by weight loss and electrochemical measurements. The corrosion rate of carbon steel and the inhibition efficiency of the propolis were calculated. The results obtained showed that propolis could serve as an effective inhibitor for the corrosion of...

Author(s): A. S. Fouda and A. Hamdy Badr

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