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Volume 34: Recent submissions

Now showing items 21-40 of 47

Regioselective Ring-Opening of Aziridines and Epoxides with Amines under Catalyst- and Solvent-Free Condition on Solid Phase

WANMEI LI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

: Ring opening of aziridines and epoxides with various amines afforded high regioselective products in high yields by solid phase reaction under catalyst- and solvent- free condition. The ring opening reaction proceeded ...
Facile Synthesis of Poly (Carbonyl Urea) Oligomer (Pcuo) from Urea and Dipropyl Carbonate (Dprc) Applied as Nitrogen Slow-Release Fertilizers

JIANCHAO CHEN; YAQING LIU; HONGFANG JIU; PEIHUA ZHAO; FUTIAN ZHU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

a novel slow-release nitrogen fertilizer poly(carbonyl urea)oligomer (PCUO) was prepared by the condensation polymerization of urea and dipropyl carbonate (DPrC) at normal pressure, in which anhydrous potassium carbonate ...
Development and Validation of Green Method for Estimation of Clarithromycin in Pharmaceutical Formulation by Transmission Fourier Transform Infrared Spectroscopy

MUHAMMAD ALI MALLAH; SYED TUFAIL HUSSAIN Sherazi; SARFARAZ AHMED MAHESAR; ABDUL RAUF (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A rapid, sensitive and environmental friendly analytical method for the direct determination of clarithromycin in tablet formulations through transmission Fourier Transform Infrared (FT-IR) spectroscopy has been successfully ...
Phenolic Contents, Antioxidant Properties Phenolic Contents and Antioxidant Properties of Muscari parviflorum Desf.

RAMAZAN MAMMADOV; PINAR ILI; OLCAY DUSEN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Oxidative stress can be the result of normal metabolic activity or environmental factors. Geophytes, especially the Muscari Mill. species are very important in the plant groups. Many kinds of flavonoids have been identified ...
Synthesis of Gluconic Acid and its Salts by using Bimetallic Catalyst

M. ABDUL QADIR; SADIA ATTA; FAISAL JAMSHAID (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

The present work deals with the oxidation of glucose to gluconic acid over bimetallic (Pd-Bi) catalysts supported on glassy carbon. The 10-25 µg/g quantities of Pd and Bi was supported on glassy carbon by means of ...
Synthesis and Physicochemical Studies of Metal Carboxylates Bearing Phenyl Ferrocene

SUMERA AZIZ; ZAREEN AKHTER; ASGHARI GUL (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Some novel metal carboxylates bearing phenyl ferrocene were synthesized by the reaction of Na salt of 4-ferrocenylbenzoic acid with different transition metal phosphine complexes using dichloromethane as solvent. ...
Vernonione, A New Urease Inhibitory Carvotacetone Derivative from Vernonia cinerascens

IRSHAD AHMAD; BASHIR AHMAD CHAUDHARY; MUHAMMAD ASHRAF; MUHAMMAD UZAIR; KHALID HUSSAIN JANBAZ (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Vernonione, a new 7-deoxycarvotacetone derivative 1, together with three known sesquiterpene lactones; vernolide A, C (2,3) and potamopholide (4) has been isolated from the methanolic extract of the roots of Vernonia ...
Effect of Zirconium Nanoparticles on the Mechanical Properties of Light-Cured Resin Based Dental Composites

NIGHAT AFZA; ITRAT ANIS; MUHAMMAD ASLAM; MUHAMMAD RAZA SHAH; MUHAMMAD TAHIR HUSSAIN; TANVEER HUSSAIN BOKHARI; AJAZ HUSSAIN; MUHAMMAD SAFDER (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

The aim of this study was to evaluate the mechanical properties of conventional composite resins (Solare-P) and the modified composite resin having mixed with zirconium nanoparticles. The composite resins are used to replace ...
Oxidative Degradation of Phenol in Aqueous Medium Catalyzed by Lab Prepared Cobalt Oxide

MUHAMMAD SAEED; MOHAMMAD ILYAS; MOHSIN SIDDIQUE (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

This work explores the preparation and characterization of cobalt oxide catalyst and investigation of its catalytic activities for oxidative degradation of phenol in aqueous medium. The catalyst was prepared by mechanochemical ...
FORMATION OF NOVEL AMINO VIC-DIOXIME COMPLEXES OF CU(II), NI(II), CO(II) AND CD(II) OF 1,3-DIOXALANE GROUPS CONTAINING THE OXIME MOIETY: THERMAL, MAGNETIC AND SPECTRAL STUDIES

SIBEL DUMAN; MEMET SEKERCI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A novel substituted vic-dioxime ligand containing the amino group, N,N′-[2,2′-{ethane1,2-di-yl-bis(oxy)bis(2,1-phenylene)}bis(N′-hydroxy)-2-(hydroxyimino)acetimidamide] (L1 ) has been prepared from 1,2-bis(o-aminophenoxy)ethane, ...
Fabrication of TiO₂ and Poly(Styrene Sulfonate) Nanocomposite Films and Their Application in Photocatalytic Degradation for Methylene Blue

PING NIU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Photocatalytic nanocomposite films with different number of bilayers were prepared via an electrostatic layer-by-layer (LbL) self-assembly method. These LbL films were further characterized by atomic force microscopy (AFM) ...
Sol–Gel Synthesis of Cathode Material MgMnSiO₄ for Magnesium Cells

JIAN-ZHI SUN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A cathode materials for magnesium cells MgMnSiO₄ was synthesized via sol-gel method in this work. DSC-DTA, XRD, IR, SEM were used to characterize the reaction and product. The results showed that the product is well-crystalled ...
Investigations on Catalytic Oxidation of Acetaldehyde into Peracetic Acid in a Trickle Bed Reactor

YI WANG; BO LIU; LIBO LI; JUN YOU; YONGBIN SONG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Acetaldehyde in liquid phase was oxidized into peracetic acid (PAA) by O₂ in a trickle bed reactor in the presence of various organic ferric salts as catalysts. The reaction conditions including temperature, O₂ pressure ...
Studies on the Performances of SO₄²⁻/ZrO₂-Fe₃O₄-MxOy (M=Mg, Zn, Ti) Magnetic Solid Acids

BO REN; MEIQING FAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A series of solid acid catalysts Studies on the Performances of SO₄²⁻/ZrO₂-Fe₃O₄ (SCFZ), SO₄²⁻/ZrO₂-Fe₃O₄MgO (SZM), SO₄²⁻/ZrO₂-Fe₃O₄-TiO₂ (SZT) and SO₄²⁻/ZrO₂-Fe₃O₄-ZnO (SZZ) are prepared in chemical co-precipitation method. ...
Brønsted Acidic Ionic Liquid 1-n-butylimidazolium tetrafluoroborate ([hbim]bf4): A Green Catalyst and Recyclable Medium for the Azidolysis of Epoxides

FARIBA HEIDARIZADEH; AMANOLAH ZAREI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Epoxides undergo rapidly ring opening with sodium azide in [Hbim]BF4/H2O (2:1) medium, under mild condition to afford the corresponding 2-azidoalchols in high yields. The remarkable features of this procedure are improved ...
Antibacterial Activity of Vacuum Liquid Chromatography (VLC) Isolated Fractions of Chloroform Extracts of Seeds of Achyranthes Aspera

NOOR-UL-AMIN; M. IMRAN QADIR; TAHIR JAVED KHAN; GHULAM ABBAS; BASHIR AHMAD; KHALID HUSSAIN JANBAZ; MUHAMMAD ALI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

Antibacterial activities of locally occurring weed Achyranthes aspera were studied. Three solvents (Hexane, Chloroform, and Ethanol) were used successively for the extraction of active principles from the seeds of this ...
Synthesis Route and Characterization of Hydroxyapatite Powder Prepared from Waste Egg Shells

FARZANA HABIB; SHAHZAD ALAM; NASEEM ZAHRA; MUHAMMAD IRFAN; WAQAS IQBAL (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A novel route is reported to prepare Hydroxyapatite powder (HAp) from egg shells. Eggshells were used as calcium precursor containing 94-97 % CaCO₃. HAp was synthesized by reacting calcined egg shell powder with reagent ...
Effect of Ce Substitution on Structural and Electrical Properties of W-type Strontium Hexaferrite Nanomaterials

IMRAN KHAN; MUHAMMAD NAEEM ASHIQ; IMRAN SADIQ; ASHEAQ MAHMOOD QURESHI; MAZHAR URANA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

A series of W-type hexaferrites having composition Sr₃CexFe₁₆xO₂₇(x = 0.00, 0.02, 0.04, 0.06) has been prepared by the chemical co-precipitation method. The effect of cerium substitution at Fe site on the structural and ...
Adsorption Kinetics of Protons by α-Aluminium Hydroxide

SYED MUSTAFA; MUHAMMAD SAFDAR; MUHAMMAD WASEEM; ABDUL NAEEM; SYED TASLEEM; KHIZAR HUSSAIN SHAH; MOHAMMAD TARIQ JAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

The adsorption desorption rate of H⁺ ions on α-aluminium hydroxide has been investigated as a function of pH and temperature from aqueous electrolyte solution of ZnCl₂. It is observed that the protonation of the α-Al(OH)₃ ...
Ultrasonically Assisted Extraction and HPLC Determination of Chondroitin Sulfate from Fish Heads

CHUN LIN KE; XIAO XIONG ZENG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2012-06-20)

In the present study, we investigated the ultrasonically assisted extraction(UAE) and high-performance liquid chromatography (HPLC) determination of chondroitin sulfate(CS) from fish heads. Firstly, the optimized parameters ...

Now showing items 21-40 of 47

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