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Browsing Issue 04 by Issue Date

Now showing items 1-20 of 30

Optimization of Acid-Activated Bentonites on Bleaching of Cotton Oil

ORAL LACIN; ENES SAYAN; ELIF GULSAH KIRALI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-07-01)

Bentonites are commonly used adsorbent on bleaching cotton oil to produce edible oil products. Bleaching capacities of neutralized cotton oil were investigated with acid-activated Arguvan and Kurşunlu bentonites. Two models ...
Structural Elucidation of in Vitro and in Vivo Metabolites of Emodin in Rats by LC -ESI-MS/MS

DONGGENG WANG; LINA CHEN; QING ZHU; GUANGTONG CHEN; BAOHUA LIU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-01)

Emodin is a widely occurring natural product and has been studied extensively for its varieties of pharmacological activity. In attempt to know more deeply about its metabolism, this paper investigated the metabolites of ...
Simultaneous Determination of Six Food Additives in Drinks by High Performance Liquid Chromatography Coupled to Diode Array Detector Detection

QINGHUA YAN; LI YANG; XIAOQIN MA; HUIGEN FENG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-02)

A reversed-phase high performance liquid chromatographic method for the successful separation and determination of 6 synthetic food additives (aspartame, acesulfame potassium, benzoic acid, sodium saccharin, tartrazine and ...
Development of High Performance Liquid Chromatographic Method with Pre-Column Derivatization for Determination of Enantiomeric Purity of Hydantoin-5-acetic Acid

DAO CAI WANG; YU CAO; ZHI JIAN HE; SHUN YAO; HANG SONG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-02)

The objective of the present work was to develop and validate a rapid analytical method for determination of enantiomeric purity of hydantoin-5-acetic acid. The method was based on pre-column derivatization of hydantoin-5-acetic ...
Synthesis of N, N'-bis(benzoyl) azelaic acid dihydrazide and its Effect on Performance of Poly (L-lactic acid)

YAN-HUA CAI (The chemical society of Pakistan is an approved society from the PSF., 2013-08-02)

In order to synthesize more function amides, N, N'-bis(benzoyl) azelaic acid dihydrazide(NA(A)) was synthesized from benzoyl hydrazine and azelaoyl chloride which was deprived from azelaic acid via acylation. The influence ...
Density, Electrical Conductivity, Acidity, Viscosity and Raman Spectra of Aqueous NaBO₂, Na₂B₄O₇ and NaB₅O₈ Solutions at 298.15 and 323.15K

ZHOU YONGQUAN; FANG CHUNHUI; FANG YAN; ZHU FAYAN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-03)

Density, electrical conductivity, viscosity and acidity of aqueous NaBO₂, Na₂B₄O₇ and NaB₅O₈ solutions were preciously measured as functions of concentration from dilute to super-saturation at 298.15 and 323.15 K. The ...
Poly (N-vinyl-2-pyrrolidone-co-acrylic acid): Comparing of “Traditional Heating” and “Microwave-Assisted” Free Radical Polymerization

KADRIYE KIZILBEY; SERAP DERMAN; ZEYNEP MUSTAFAEVA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-03)

In organic chemistry microwave irradiation has become a common heat source and the use of microwave irradiation is also increasingly studied for polymerization reactions. Polymers have been synthesized at long reaction ...
Synthesis and In vitro Antioxidant Activities of Novel 4-(3-methyl-2-thienylmethyleneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one Derivatives with Their Acidic Properties

OZLEM GURSOY KOL; HAYDAR YUKSEK; FATIH ISLAMOGLU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-03)

In the present study 3-alkyl(aryl)-4-amino-4,5-dihydro-1H-1,2,4-triazol-5-ones 2a-i reacted with 3-methyl-thiophene-2-carboxyaldehyde to afford the corresponding 3-alkyl(aryl)-4-(3-methyl-2-thienylmethyleneamino)-4,5-dih ...
Novel QSAR Combination Forecast Model for Insect Repellent Coupling Support Vector Regression and K-Nearest-Neighbor

LI-FENG WANG; XIAN-SHENG TAN; ZHE-MING YUAN; LIAN-YANG BAI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-04)

To improve the precision of quantitative structure-activity relationship (QSAR) modeling for aromatic carboxylic acid derivatives insect repellent, a novel nonlinear combination forecast model was proposed integrating ...
Synthesis of 8-substituted 4, 4-difluoro-4-bora-3a,4a-diaza-s-indacene Dyes (BODIPY)

AHMET TUTAR; RAMAZAN ERENLER; JEAN-FRANÇOIS BIELLMANN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-04)

4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dyes are important in synthetic and applied chemistry. The reaction of pyrrolomethane 1 with acetyl chloride and boron trifluoride etherate in the presence of triethylamine ...
Determination of Estrogens in Milk by HPLC using Salting-Out Extraction

DEQING ZOU; YAN ZOU; ZHIGANG TAI; QI WANG; YALING YANG (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-04)

A simple salting-out assisted liquid–liquid extraction (SALLE) method with acetonitrile combined with high-performance liquid-chromatography was developed and applied for the determination four kinds of estrogens (estradiol ...
Synthesis of Attapulgite Clay@Fe₂O₃ Composite via Ionic Liquid and Its Application in the Oxidation of Elemental Mercury

HUI CANG YU LU; FEN NV HAN; JING LING SHAO; QI XU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-04)

Attapulgite clay@Fe₂O₃ (ATP@Fe₂O₃) composite was prepared by a one-pot calcination process via the ionic liquid (IL), [bmim]PF₆, using two cheap, ecofriendly materials (i.e., Fe(NO₃)₃•9H₂O and ATP, which is a magnesium ...
Synthesis of Substituted 1, 4-dihydro-4-ferrocenylpyridines and 3-ferrocenyl-2-pyrazolines Catalyzed by Ionic Liquid [Bmim] OH

JIAN ZHANG; CHENGXIANG SHANG; LONGFEI JIN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-04)

5-aryl-3-ferrocenyl-1-phenyl-2-pyrazolines have been synthesized by the reaction of α, β-unsaturated ketones with phenylhydrazine in ionic liquid [Bmim]OH. While 4-ferrocenyl-1,4-dihydropyridine-2,6-dimethyl-3,5-dicarboxylic ...
Study on the Way of Urea Removal by BAF

YAN LILONG; LI WEIGUANG; REN YUAN; LIU YU; ZHANG YING (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2013-08-05)

Biofilm process is a kind of efficient way for sewage with high concentration of urea. A lot of researches on removal efficiency were carried out, but there existed less research for the process of urea removal. To understand ...
Application of Antioxidant Indicators to Select Nicotine-Degrading Bacterium for Bioaugmented Treatment of Tobacco Wastewater

HONGZHEN HE; MEIZHEN WANG; HUAJUN FENG; XIN ZHENG; DONGSHENG SHEN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-05)

To select nicotine-degrading bacterium for bioaugmented treatment of tobacco wastewater, the activities of antioxidant indicators such as superoxide dismutase (SOD), catalase (CAT) and glutathione (GSH), and the ability ...
Application of l-Ascorbic Acid and its Derivatives (Sodium Ascorbyl Phosphate and Magnesium Ascorbyl Phosphate) in Topical Cosmetic Formulations: Stability Studies

SLIM SMAOUI; HAJER BEN HLIMA; ADEL KADRI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-06)

The present study aimed to formulate and subsequently evaluate a topical skin-care cream (o/w emulsion) from l-ascorbic acid and its derivatives (sodium ascorbyl phosphate and magnesium ascorbyl phosphate) at 2% versus its ...
Study of Co (II) and Cr (VI) Adsorption from Aqueous Solution by CaCO³

FRANCISCO GRANADOS-CORREA; ELIZABETH GARCÍA ALCÁNTARA (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-06)

Calcium carbonate was synthesized, characterized, and utilized in water purification. The adsorption of Co(II) and Cr(VI) ions from aqueous solutions in CaCO₃ was studied as a function of different optimal conditions, such ...
Synthesis of Three New Donor- Acceptor [4] Dendralenes

MIR MUNSIF ALI TALPUR; TAJNEES PIRZADA; PETER SKABARA; THOMAS WESTGATE; MOHAMMAD RAZA SHAH (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-06)

Three new donor - acceptor [4] dendralene compounds have been synthesized. Wittig reaction was used for the preparation of first two compounds and third one by Knoevehagel condensation. Their mass was calculated by APCI ...
Gas Chromatographic Mass Spectrometric Analysis of n-Hexane Fraction of the Leaves of Sugar Beets (Beta vulgarus)

ZAHID HUSSAIN; PIR MOHAMMAD; KHAIR ZAMAN; KHALID MOHAMMED KHAN; SHAHNAZ PERVEEN; SADAF NIAZ (HEJ Research Institute of Chemistry, University of Karachi, Karachi, 2013-08-06)

The n-hexane fraction of the leaves of sugar beet was analyzed qualitatively and quantitatively using GC-MS and GC equipped with FID in separate experiments. The crude was extracted using ethanol and fractionated by n-hexane, ...
A Facile Multi Component Synthesis of Some Functionalized Chromenes and Spiroindole Derivatives using DABCO as an Efficient Catalyst

AKBAR MOBINIKHALEDI; MAHSA JABBARPOUR (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-06)

Chromene and spirocyclic 2-oxindole derivatives were readily synthesized in good yields via a one-pot three-component reaction involving Knoevenagel condensation of aromatic aldehyde or isatin with an active methylene ...

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