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

Eco-friendly chalcones derivatives as corrosion inhibitors for carbon steel in hydrochloric acid solution

October 2013

  The inhibiting effect of some chalcones derivatives on the corrosion of carbon steel in 1 M HCl was studied by weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. The results showed that the inhibition efficiency increases with increasing the inhibitor concentration, while it decreases with increasing the...

Author(s): A. S. Fouda, M. A. Elmorsi and A. Elmekkawy

Electronic and steric effects in the control of the Anilinium chloride catalyzed condensation reaction between Aldones and 4-Phenylthiosemicarbazide

September 2013

  A concise series of aldehydes and ketones were reacted in a condensation reaction with 4-phenylthiosemicarbazide in order to assess the relative influence of the steric and electronic effects in the control of this reaction. While steric effects had a modest impact, electronic effects and in particular the mesomeric donating effect delivered by a phenyl ring produced a strong passivating influence on the...

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

Assessment of dissolved manganese (II) pollution in river water by differential pulse cathodic stripping voltammetry: A case study of River Boubo, Côte d'Ivoire

September 2013

  Boubo river and lagoon, south Côte d’Ivoire, are contaminated by manganese released in wastewater from manganese exploitation and from the soil of Grand-Lahou region in Côte d’Ivoire. So, there is a need to develop a simple method for the evaluation of manganese present in natural water. This work reports the utility of rapid and inexpensive method for determination of dissolved...

Author(s): Coulibaly Mariame, , Yao N’Guessan Alfred, Bamba Drissa, Ghanjaoui Mohammed El Amine, Yousry M. Issa and El Rhazi Mamia

Chromium, an essential nutrient and pollutant: A review

September 2013

  The increased use of chromium (Cr) in several anthropogenic activities has led to the subsequent soil, surface water and ground water contamination. It has wide applications in the dyes, stainless steel, leather tanning, electroplating of chrome, and wood preservatives industries. Chromium exists in the environment in several diverse forms such as Cr(0), Cr(III) and Cr(VI) species. Cr toxicity depends on its...

Author(s): Mandina Shadreck and Tawanda Mugadza

Anti-Helicobacter pylori activity of Abelmoschus esculentus L. Moench (okra): An in vitro study

September 2013

The anti-Helicobacter pylori activity of the methanol and hexane extracts of Abelmoschus esculentus L. Moench (okra) dried fruits were evaluated on forty-one clinical isolates and a standard ATCC 43504 strain by the use of agar well diffusion technique. The methanol extract of A. esculentus showed A. esculentus L. Moench (okra) dried fruit had inhibitory effects against Helicobacter strains; with diameters zone of...

Author(s): Olorunnipa Taiye A., Lawal Temitope O., Igbokwe Christopher C. and  Adeniyi Bolanle A

Uvaria chamea root as green corrosion inhibitor for mild steel in acidic solution

August 2013

  The corrosion inhibition of mild steel is the subject of tremendous technological importance due to the increased industrial applications of these materials. This study reports the corrosion inhibition of mild steel in acidic solution of 0.5 M HCl using root extract of Uvaria chamea by way of gravimetric measurements. It was shown that the presence of U. chamea root extract inhibited the...

Author(s): Lebe A. Nnanna, Onyinyechi C. Nwadiuko, Francis O. Nwosu, David O. Dimojiand Kingsley I. Mejeh

Analysis of the levels of arsenic in home-made brews, spirits, in water and raw materials using Hgaas in Nairobi county

August 2013

  This study was carried out to determine the levels of arsenic in the home-made brews, home-made spirits, raw materials and water. One hundred and thirty two home - made alcoholic beverages, one hundred and ten water and eighteen raw materials samples obtained from various parts of Nairobi slums and its environs were analyzed for arsenic. The method of analysis was hydride generation atomic absorption...

Author(s): Masime Jeremiah O, Wanjau Ruth, Murungi Jane and Onindo Charles

Investigation of some factors that affect jakura limestone burning

August 2013

  Limestone calcination reaction seems to be a very simple and straight-forward reaction. However, there are numerous critical variables that exert profound effect on lime burning operations. The factors and variables that affect the burning of limestones must be considered in the selection, design and optimization of the calcininig equipment. Limestone burning in a vertical kiln often presents complex problems...

Author(s): P. C. Okonkwo and S. S. Adefila

Sample ion/sample molecule reactions in gas chromatography/chemical ionization mass spectrometry of polyethylene glycols and polyethylene glycols dimethyl ethers

July 2013

Sample ion/sample molecule (SISM) reactions frequently occur under chemical ionization (CI) conditions with large sample size polar compounds, and are useful in forming MH+ions for molecular weight determination. Studies about the variation of chemical ionization spectra with sample size were made in this report using gas chromatography/mass spectrometry, GC/MS, to observe the relative abundances of the major ions in...

Author(s): Adebayo O. Onigbinde, Burnaby Munson and Bamidele M. W. Amos-Tautua

A comparative investigation on the field performance of two mineral diesel engine oil

July 2013

The technique of inductively coupled plasma (ICP), has been employed for monitoring the level of 24 different elements in two equivalent engine oils. Tracing have been made at 0, 500, 1000, 2000, 2500, 3000, 4000, and 6000 km of operation. In the case of both of the oils, the results indicate decreasing as well as increasing trends in concentrations of different elements. The obtained data have been interpreted based on...

Author(s): Sahar Peyman, Abolfazl Semnani, Hamid Shakoori Langeroodi, Ali Reza Zangenehand Saeed  Habibollahi

Acrylonitrile derivatives as corrosion inhibitors for Cu10Ni alloy in 0.5 M hydrochloric acid solution

July 2013

Corrosion inhibition of Cu10Ni alloy in 0.5 M HCl solution using acrylonitrile derivatives namely: (E)-2-(1H-indole-3-carbonyl)-3-(2-oxo-2-phenylethylthio)-3-(phenylamino)acrylonitrile(a),(E)-2-(1H-indole-3-carbonyl)-3-mercapto-3-(phenylamino)acrylonitrile(b)and(Z)-2-(1H-indole-3-carbonyl)-3 phenylacrylonitrile (c) was investigated by potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and...

Author(s): A. S. Fouda, M. Abdallah and M. El-Hoseiny

Preconcentration of trace Ni (II) using C18 disks modified cyclodextrin–chitosan/nano graphene oxide

July 2013

A novel, sensitive and effective method has been developed for preconcentration of Ni on C18 disks modified cyclodextrin–chitosan/nano graphene oxide. Simple chemical bonding method to synthesize cyclodextrin–chitosan/nano graphene oxide (CCGO) was reported. The adsorption behaviors of Ni (II) in aqueous solution on CCGO were systematically investigated. The procedure is based on the selective formation...

Author(s): Ali Moghimi

Ab-initio and DFT studies of the kinetics, mechanisms and thermodynamics of the gas-phase pyrolysis of ethyl bromide

June 2013

The kinetics, mechanisms, thermodynamics and vibrational studies of the pyrolysis of ethyl bromide in the gas – phase at 623 K was studied using HF at 3-21G, 6-31G* and DFT with B3LYP/6 31G*, 6-311++G (2df, 2p) basis sets. The reaction proved to be a unimolecular reaction and followed a first order rate equation. The Arrhenius parameters, such as log A with HF at 3-21G, 6-31G* = 13.93, 13.86; DFT/B3LYP at 6-31G*,...

Author(s): I. A. Adejoro, O. O. Adeboye and T. Esan

Preconcentration of benzene and phenolic compounds in water sample by adsorption on Carbon nanotubes coated fiber

June 2013

A simple method has been developed for the preconcentration of benzene and phenolic compounds (BPC) by the adsorption of its carbon nanotubes (CNTs). The preconcentration of benzene and phenolic compounds (BPC) are ubiquitous pollutants, and many of them are carcinogenic or mutagenic. Carbon nanotubes (CNTs) are a kind of novel and interesting carbon material which can be used for separation and purification. In this...

Author(s): Ali Moghimi and Mahdi Alijanianzadeh

Preparation of Cobalt (III) complexes with trans-1,2-diaminocyclohexane N,N,N’,N’-tetra acetatic acid (CDTA) and ethylenediamine tetraacetic acid (EDTA)

June 2013

The preparation and isolation of complexes trans 1,2 diaminocyclohexane N, N, N’, N’- tetraacetato cobalt (III) [Co(CDTA)] - and ethylenediamine-tetraacetato cobaltate (III) [Co(EDTA)]-  by direct oxidation of cobalt (II) with peroxodisulfate ion in the presence of Ag+ ion as a catalyst is being reported. The stoichiometry of the complexes has been confirmed through spectroscopic techniques i.e....

Author(s): Abida Perveen, Teimoor Nezamoleslam and Iftikhar Imam Naqvi

The chemical composition of essential oil from the root of Cissampelos owariensis (p.beauv) and free radical scavenging activities of its extracts

June 2013

Air dried root of Cissampelos owariensis (P.Beauv) on steam distillation yielded 0.82% (w/w) of essential oil. Gas chromatography–mass spectrometry (GC-MS) analysis of the oil resulted in the identification of 11 compounds, among which 1H-cyclopropa[a]naphthalene,1a, 2, 3, 5, 6, 7, 7a, 7b-octahydro-1, 1, 7, 7a-tetramethyl-,(1aR-1aa, 7a, 7aa, 7ba) was found to be the most abundant at 39%. The antioxidant...

Author(s): Olajide Olutayo, Orishadipe Abayomi, Fatokun Olakunle, Akande Temitope and IIiya Ibrahim

Quinazolin derivatives as eco-friendly corrosion inhibitors for low carbon steel in 2 M HCl solutions

May 2013

Some quinazoline derivatives such as: 3-(4-chlorophenyl)-2-methylquinazolin-4(3H)-one (CMQ) and 2-methyl-3-(4-nitrophenyl) quinazolin-4(3H)-one (MNQ) were investigated as corrosion inhibitors for carbon steel in 2 M HCl solution. Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, electrochemical frequency modulation and weight loss methods were used to study the inhibition action at 30°C....

Author(s): A. S. Fouda, G. Y. Elewady, H. A. Mostafa and S. Habbouba

Determination of some essential minerals in selected edible insects

May 2013

The essential minerals, Cu, Fe, Mg, Co, Zn, Na and K were determined in selected edible insects (Locust, Cricket, Grasshoppers and Termite) using standard analytical method. The result obtained from the study shows that  Cu content ranged from 85.5 ± 3.40 mg/kg; Fe from 390.025 ± 31.61 mg/kg; Mg from 1534.84 ± 85.01 mg/kg; Co from 4.35 ± 0.28 mg/kg; Zn from 208.11 ± 63.90 mg/kg;...

Author(s): Ajai A. I., Bankole M., Jacob J. O. and Audu U. A.

Speciation of heavy metals in soil, and their phytoavailability in edible part of Amaranthus hybridus cultivated along major roads in Ile- Ife, Nigeria

May 2013

Heavy metal content in soil and Amaranthus hybridus cultivated on it were determined by speciation method and acid dissolution. The atomic absorption spectrophotometer was used to quantify the metals in the soil and vegetable. The mobilisation of metals from soil to plants as indicated by the metal contents in the soil and vegetables decreased in this order Fe> Mn > Zn > Cu >Pb >...

Author(s): Olabanji Iyabo Oluremi, Oluyemi Emmanuel Ayodele, Bello Muibat Olabisi and Makinde Oladotun Wasiu

Heavy metal levels in selected green leafy vegetables obtained from Katsina central market, Katsina, North-western Nigeria

May 2013

The levels of Lead (Pb), Cadmium (Cd), Iron (Fe), Zinc (Zn) and Copper (Cu) were determined in four different samples of vegetables purchased from Katsina central market using atomic absorption spectrometer. The mean concentrations of metals ranged from 0.071 mg/kg Pb to 0.632 mg/kg Cu. The relative abundance of metals in vegetables followed the sequence Cu (0.483 mg/kg) > Zn (0.268 mg/kg) > Fe (0.260 mg/kg) >...

Author(s): Shuaibu l. K., Yahaya M., and Abdullahi U. K.

Removal of Erichrome Black T from aqueous solution using low cost waste biomass (cow dung ash) at 303 and 308K

April 2013

Waste biomass cow dung ash was used as an adsorbent for the removal of Erichrome Black T (EBT) from aqueous solution using simple batch technique. The contact time in terms of adsorption capacity was optimized at 303 and 308K, respectively and it was found to be 60 min for both temperatures. All the experiments were carried out at pH = 7. The adsorption capacity of EBT increased from 0.20 to 0.75 and 0.2 to 0.8 mg/g...

Author(s): Rashid Mahmood and Afia Naseer

Polycyclic aromatic hydrocarbons in smoked Lates niloticus from selected markets, Gulu District, Uganda

April 2013

Hot smoking is among the oldest methods of preservation which mankind has used in food processing. Potential health hazards associated with smoked foods may be caused by carcinogenic components of wood smoke – mainly polycyclic aromatic hydrocarbons (PAHs) and their derivatives. This paper presents results based on the determination of PAHs in smoked Lates niloticus from three markets in Gulu district, northern...

Author(s): Acaye Ongwech, George William Nyakairu, Jolocam Mbabazi Justus Kwetegyekaand Margaret Masette

Synthesis and antibacterial activity of 7-deacetoxy-7α-hydroxygedunin

April 2013

A convenient synthetic route for bioactive 7-deacetoxy-7α-hydroxygedunin was realized by one-step conversion of 7-deacetoxy-7α-hydroxygedunin potassium salt. The 7-deacetoxy-7α-hydroxygedunin was obtained in 88% w/w yield as a fluffy white precipitate by recrystallization from methanol. The 7-deacetoxy-7α-hydroxygedunin and the starting material were evaluated for antibacterial activity...

Author(s): Okhale S. E., , Amupitan J. O., Ndukwe I. G., Ayo R. G., Oladosu P. O. and Okogun J. I.

Solid phase extraction and determination of Chromium species using multiwalled carbon nanotubes by solid phase extraction: Flame atomic absorption spectrometry (FAAS)

April 2013

Multiwalled carbon nanotubes (MWNTs) were used as absorbent for extraction of trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)), ions in the presence of diethyldithiocarbamate as a chelate by solid phase extraction method. A novel and selective method for the fast determination of trace amounts of chromium species in water samples has been developed. The procedure is based on the selective formation of...

Author(s): Ali MOGHIMI

A report on soap making in Nigeria using indigenous technology and raw materials

April 2013

In everyday life we use soap to wash dishes, clean clothes, or keep our bodies presentable to nose and eye. Soap therefore has numerous applications in our daily life. One of its great values is keeping our household a far better place to live and work. However, contrary to what one may think, soap was invented not only for the purpose of personal hygiene; rather, it was invented to solve other purposes. Colourful yarns...

Author(s): Warra, A. A.

An assessment of surface water pollution status around Gboko abattoir

March 2013

An assessment of surface water around Gboko abattoir was conducted to ascertain the pollution status of water around the area. The results showed mean values as: total dissolved solids (TDS), 1026.78 mg/L; TSS, 565.22 mg/L; dissolved oxygen (DO), 5.0 mg/L; phosphate, 8.89 mg/L and biochemical oxygen demand (BOD), 484.64 mg/L. These values were above regulatory standards. The values of; pH (6.6), sulphate (86.91 mg/L),...

Author(s): S. T. Ubwa, G. H. Atoo, J. O. Offem, J. Abah and K. Asemave

Preconcentration and determination of Mercury(II) from natural water and milk sample by Histidine functionalized multi-walled carbon nanotubes (MWCNTs-His)

March 2013

A simple method has been developed for the preconcentration of Mercury(II) [Hg(II)] based on the adsorption of its histidine functionalized multi-walled carbon nanotubes (MWCNTs-His) complex. The stability of a chemically MWCNTs-His were determined especially in concentrated hydrochloric acid which was then used as a recycling and pre-concentration reagent for further uses of MWCNTs-His. The application of this...

Author(s): Ali Moghimi and Ali Mazloumifar

Some wet routes for synthesis of hematite nanostructures

March 2013

Increased attention has been paid to the synthesis of hematite nanoparticles recently due to its properties and application in various fields of modern technology. Various methods (aqueous and non-aqueous) have been applied in order to produce hematite nanostructures of required size and morphology suitable for these various applications. The aqueous route has been found to be simpler and more versatile than the...

Author(s): Ibrahim Abdulkadir and Abubakar Babando Aliyu

Free radicals and antioxidants: Myths, facts and mysteries

March 2013

Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are well recognized for playing a dual role as both deleterious and beneficial species. Overproduction of ROS arising either from mitochondrial electron transport chain or excessive stimulation of NAD(P)H oxidase results in oxidative stress, a deleterious process that can be an important mediator of damage to cell structures, including lipids and...

Author(s): Abid A. Lone, Shaiq A. Ganai, Rayees A. Ahanger, Hilal A. Bhat, Tauseef A. Bhat, Imtiyaz A. Wani

Corrosion inhibition for mild steel in 0.5 M H2SO4 solution using Achyranthes aspera L. leaf extract

February 2013

The leaf extract of Achyranthes aspera L. was investigated for corrosion inhibition of mild steel in 0.5 M H2SO4 medium at room temperature. Gravimetric technique was used to study the corrosion behavior in the absence and presence of different concentrations of the leaf extract. The result obtained showed that the A. aspera L. is a good inhibitor for mild steel in 0.5 M H2SO4 solution. The...

Author(s): Francis O. Nwosu, Lebe A. Nnanna and K. B. Okeoma

Preliminary phytochemical screening and antimicrobial evaluation of four medicinal plants traditionally used in Nigeria for skin infection

February 2013

The antimicrobial effect of some selected Nigerian medicinal plants traditionally used by the local people for treating skin infections was evaluated on some microorganisms likeCandida albicans MTCC 227, Staphylococcus aureus ATCC 2785, Proteus mirabilisATCC 21784 and Pseudomonas aeruginosa ATCC 27856. The solvents used for extraction were water, ethanol, methanol and petroleum ether....

Author(s): A. B. Fawehinmi, Hassan Lawal, S. O. Etatuvie and F. O. Oyedeji

Highly efficient epoxidation of olefins with hydrogen peroxide oxidant using modified silver polyoxometalate catalysts

February 2013

The catalytic epoxidation of olefins is an important reaction in chemical industry since epoxides are versatile and important intermediates in the synthesis of fine chemicals and pharmaceuticals. The current epoxidation procedures often use stoichiometric organic and sometimes toxic inorganic oxidants that are less favourable from an environmental and economical point of view. In contrast to such processes, catalytic...

Author(s): Emmanuel Tebandeke, Henry Ssekaalo and Ola F. Wendt

N-doped carbon aerogels for carbon dioxide (CO2) capture

February 2013

The N-doped carbon aerogel materials were investigated to explore their potential use in carbon dioxide (CO2) capture. Carbon aerogels were prepared from a nitrogen-containing polymer precursor using urea as nitrogen source into the polymer matrix through the sol-gel method. CO2 capture performances were evaluated from 273 to 298K at 1 bar. CO2adsorption is influenced by the micropores and amount of a...

Author(s): Aimé Serge Ello, Jacques Aboua Yapo and Albert Trokourey

Benzothiazole derivatives as corrosion inhibitors for carbon steel in 1 M phosphoric acid (H3PO4) solution

February 2013

The inhibition of the corrosion of carbon steel in 1 M Phosphoric acid (H3PO4) solutions by some benzothiazole derivatives had been investigated using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS) and electrochemical frequency modulation (EFM) techniques. Inhibition was found to increase with increasing concentration of the benzothiazole derivatives but decreased with rise in...

Author(s): A. S. Fouda, M. Diab, A. El-Sonbati and Sh. A. Hassan

Separation of lead(II) paraffin-embedded tissues from liver loggerhead turtles specimens by organic-solution-processable functionalized-nano graphene prior to determination by flame atomic absorption spectrometry (FAAS)

February 2013

A novel and selective method for the fast determination of trace amounts of Pb(II) ions in liver loggerhead turtles specimens has been developed. A reliable and rapid method for preconcentration and modification of organic-solution-processable functionalized-nano graphene with Isopropyl 2-[(isopropoxy carbothioyl) disulfanyl] ethanethioate (IIDE) in order to prepare an effective sorbent for the preconcentration and...

Author(s): Ali Moghimi

Physicochemical properties and rheological behaviour of Ficus glumosa gum in aqueous solution

January 2013

The physicochemical properties, cationic composition and rheological behaviour of exudates from Ficus glumosa were investigated. The gum was found to be mild acidic, ionic and soluble in water, sparingly soluble in ethanoland insoluble in acetone and chloroform. The trend for the decreasing concentration of elements determined in the gum sample is Mg > Ca > Mn > Zn > Fe > Ni > Zn...

Author(s): Paul Ocheje Ameh

Synthesis of cholesteryl-(3,4-dihydroxy-5-methoxy tetrahydro-furan-2-yl) methanone

January 2013

Various biological membranes are synthesized from sugars-based compounds. The hydrophobic groups of them made up the amphiphilic properties in the structure of membrane that consisted fatty acids, and long chain alkyl groups. It had established that cholesterol was an integral component and it affects the fluidity of membranes. We prepared the cholesteryl-(3, 4-dihydroxy-5-methoxy-tetrahydro-furan-2-yl)-methanone from...

Author(s): Soheila Sedaghat

Chemical constituents and anti-tuberculosis activity of the root extracts of Cissampelos owariensis (P. Beauv.) Menispermaceae

January 2013

Extractives from the root of Cissampelos owariensis, were screened for antimicrobial activity against Staphylococcus aureus, Streptococcus pyogenes, Escherichia coli, Salmonella typhi, Pseudomonas aeruginosa, and Candida albicans. The crude methanol extract was found to be active against the test organisms except S. pyogenes and P.aeruginosa. The crude extract...

Author(s): Akande Rebecca, Okwute Simon Koma, Iliya Ibrahim and Efiom, Okon Otu

Separation and determination of trace amounts of Pb(II)ions in water samples using organic solution-processable functionalized-nano graphene

January 2013

A novel and selective method for the fast determination of trace amounts of Pb(II) ions in water samples has been developed. The first organic solution-processable functionalized-nano graphene (SPFGraphene) hybrid material with porphyrin–graphene nanohybrid, 5-4 (aminophenyl)-10, 15, 20-triphenyl porphyrin and its photophysical properties including optical triphenyl porphyrin (TPP) and grapheme oxide molecules...

Author(s): Ali Moghimi    

Spectrophotometric determination of Chromium(III) in Egyptian ilmenite from phosphate solution using Egyptian white sand (EWS) as a selective adsorbent

January 2013

Egyptian white sand (EWS) was used as an adsorbent for the selective separation of Cr(III) from phosphate solutions which is to be determined colorimetrically using 1,5-diphenylcarbazide. The experimental factors affecting the maximum selective adsorption/desorption of Cr(III) on/from EWS where the amount of adsorbent (g), pH of initial concentration of Cr(III) in solution, contact time, temperature and initial...

Author(s): Abdou A. Abdou

Kinetics of the adsorption of hexavalent Chromium from aqueous solutions on low cost material

December 2012

This study proposes a Jordanian Pottery (Pot-Jo) as a low cost adsorbent for the removal of chromium from aqueous solutions. The effect of contact time, initial concentration of Cr(VI), temperature and ionic strength on the adsorption of Cr(VI) onto Pot-Jo were studied and discussed. The equilibrium (qe) of adsorption of Cr(VI) onto pottery were found to be 20.287, 17.55, and 13.577 mg Cr(VI) per gram of pottery at...

Author(s): Khaldoun Al-Sou&#;od

Synthetic modification of gedunin and comparative antibacterial activity of gedunin and 7-deacetoxy-7α-hydroxygedunin potassium salt

December 2012

Gedunin, a highly oxidized triterpenoid was obtained from hexane extractive of stem wood of Entandrophragma angolense (Welw) C. D. C. of the family Meliaceae. The gedunin was dissolved in minimum methanol at 40°C and set aside in the dark for recrystallization. Pure gedunin crystals were obtained in 0.92% yield. Methanolic alkaline hydrolysis of the gedunin...

Author(s): Okhale, S. E., Amupitan, J. O., Ndukwe, I. G., Oladosu, P. O. and Okogun, J. I.

Determination and preconcentration of Mercury(II) from natural water and milk sample by Modified nano polyacrylonitrile fiber

December 2012

A simple method was developed for the preconcentration of Mercury(II) based on the adsorption of its Modified nano polyacrylonitrile fiber (PANF) complex. PANF was prepared by addition of acrylic fibers to ethanolamine (EA) with different concentration solutions. The stability of a chemically Modified nano polyacrylonitrile fiber were determined especially in concentrated hydrochloric acid which was then used as a...

Author(s): Ali Moghimi and Majid Abdouss

New compounds based on anthracene as a good candidate for organic dye-sensitized solar cells: Theoretical investigations

December 2012

The specific properties of organic-conjugated molecules and polymers are of great importance since they have become the most promising materials for the optoelectronic device technology such as solar cells. The use of low band gap materials is a viable method for better harvesting of the solar spectrum and increasing its efficiency. The control of the parameter of these materials is a research issue of ongoing interest....

Author(s): N. Belghiti, M. Bennani, M. Hamidi, S. M. Bouzzine and M. Bouachrine

Preliminary screening of aflatoxin level in maize (Zea mays L.) in some selected markets in Benue State, Nigeria

December 2012

Preliminary screening of aflatoxin B1 levels in maize (Zea mays L.) sold in some markets of Benue State, Nigeria, was carried out using thin layer chromatography (TLC). Concentrated chloroform extracts of 10, 15 and 40 μl were used in diethylether - methanol - water solvent system in the ratio of 96:3:1. Moisture contents of the stored and oven-dried fresh maize collected from the markets were in the range...

Author(s): S. T. Ubwa, K. Asemave and G. O. Igbum

Decolorization and mineralization of brilliant golden yellow (BGY) by Fenton and photo-Fenton processes

December 2012

The decolorization and mineralization of an azo dye, brilliant golden yellow (BGY, ï¬max416 nm, ï¥ = 7.81 x 103 Lmol-1 cm-1) by Fenton and photo-Fenton processes were investigated. The rate of decolorization is strongly dependent on the pH, initial concentrations of the dye, Fe(II) and H2O2. The effect of these parameters has been studied and the optimum operational conditions of these two...

Author(s): Md. Ahsan Habib, Iqbal Mohmmad Ibrahim Ismail, Abu Jafar Mahmood and Md. Rafique Ullah

Kinetics and thermodynamic studies of adsorption of malachite green onto unmodified and EDTA-modified groundnut husk

December 2012

A batch experiment was applied to study the adsorption of malachite green from aqueous solution by unmodified and ethylene diamine tetraacetic acid (EDTA)-modified groundnut husk. The effect of initial dye concentration, temperature, contact time and pH on the sorption process was investigated. The Langmuir and Freundlich adsorption isotherms were applied to test the experimental data. The chemically modified groundnut...

Author(s): Bamgbose Janet Titilayo, Bamigbade Akeem Adesina, Nkiko Mojisola Olubunmi, Ahmed Sikiru Akinyeye and Ikotun Adebomi Ayodeji  

An overview of applications of pre-column derivatization reactions for the liquid chromatographic analysis of pharmaceuticals and other compounds

December 2012

The applications of various pre-column derivatization reactions are presented in this review. The reactions are particularly applicable for various detection techniques [ultraviolet (UV), fluorescence, chemiluminscence, enantiomeric determination and mass spectrometry (MS)] in liquid chromatographic analysis of drugs and related compounds in various matrices. This review discovered that an improvement in reaction...

Author(s): Olajire A. Adegoke

Extraction of mercury (II) from sample water by Schiff base-chitosan grafted multi-walled carbon nanotubes

November 2012

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...

Author(s): Ali Moghimi

Distribution and temporal variation of selected heavy metals in sediment of River Osara mainstream drainage in North Central Nigeria

November 2012

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...

Author(s): Olatunji Olatunde Stephen and Osibanjo Oladele

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