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Browsing Volume 35 by Title

Browsing Volume 35 by Title

Now showing items 1-20 of 59

Analysis of Samarium and Europium in Wheat by ICP-MS after On-Line Separation and Preconcentration

Yong Zhang; Zhihua Ning; Luzhi Sui; Hao Zhong (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Europium and Samarium in wheat were determined by inductively coupled plasma mass spectrometry (ICP-MS) after flow injection on-line separation and preconcentration with P507 resin micro-column. The enhancement factors of ...
Antioxidant Activity of the Various Extracts of Cyclamen graecum Link Tubers and Leaves from Turkey

Hulya Metın; Cıgdem Aydın; Cennet Ozay; Ramazan Mammadov (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

IIn this study, antioxidant activities of various solvent extracts (methanol, ethanol, acetone and petroleum benzine) obtained from tubers and leaves of Cyclamen graecum Link (Primulaceae) were determined. Antioxidant ...
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 ...
Application of Multi-Walled Carbon Nanotubes Modified Glassy Carbon Electrode for Determination of Mefenamic Acid in Pharmaceutical Preparations and Biological Fluids

MOHAMMAD AFRASIABI; SHOKAT KIANIPOUR; ZEINAB REZAYATI ZAD; ALI BABAEI (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-08)

A chemically modified electrode is constructed based on multi-walled carbon nanotube modified glassy carbon electrode (MWCNTs/GCE). It is demonstrated that this sensor could be used for determination of pharmaceutically ...
Asymmetric Epoxidation of Chalcones Promoted by Chiral Schiff Bases and Amino Alcohols

Tianhua Shen; Junqi Li; Funa Cui; Xiaocong Zhou; Xiaoli Chen; Qingbao Song (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A series of chiral ligands were conveniently prepared from L-phenylalanine and characterized. Their application to the asymmetric epoxidation of chalcone was studied. The results demonstrated that 3a were efficient catalysts ...
Combined Influence of Extraction Parameters on Degree of Esterification of Sugar Beet Pulp Pectin: A Preliminary Study

Deqiang Li; Jianjiang Shang; Xinfang Ma; Xiaoyan Zhu; Zhiyong Liu (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A Box-Behnken design was employed to study the combined effects of variables of microwave-assisted extraction on pectin from sugar beet pulp. The independent variables were time and power of microwave-assisted extraction, ...
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 ...
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 ...
Determination of Synthetic Phenolic Antioxidants in Cake by HPLC/DAD after Mixed Micelle–Mediated Cloud Point Extraction

Peijin Wang; Dongling Meng; Chang liu; Yaling Yang (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

A mixed micelle-mediated cloud point extraction (MMCPE) system was developed for the extraction and preconcentration of four synthetic phenolic antioxidants (SPAs) (propyl gallate (PG), tert-butylhydroquinone (TBHQ), ...
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 ...
The Dissipation of Pyrimorph in Lake Water/Sediment Systems

ZHUONAN LI; WENBI GUAN; YONGQIANG MA; HENG ZHAO; ZHAOHAI QIN (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-10)

A study into the environmental behavior of pyrimorph in lake water/sediment systems has been carried out. The residue of pyrimorph in water and sediment for aerobic and anaerobic tests was determined, respectively. For ...
Electrochemical Analysis of Phenols through Charging of Phenol Solutions: A New Approach to Electrochemical Analysis of Phenols

Zahid Hussain; Nadia Bashir; Nisar Ahmad; Shahnaz Perveen (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Five different phenols including catechol, hydroquinone, phenol, phloroglucinol and resorcinol were analyzed using a novel electrochemical method of analysis. This method exploits the properties of the phenols to store ...
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 ...
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, ...
Investigation of a New Spectrophotometric Method for the Analysis of Carbohydrates using glucose as model

Zahid Hussain; Khalid Mohammed Khan; Asif Ali; Nasr ullah Shah; Shahnaz Perveen (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Carbohydrates are biomolecule of significant importance. Its analysis is of prime importance in the clinical investigations, delivery of medicines and quality control operations of food and fuel products. Based on its ...
Microwave Assistant Synthesis, Crystal Structure and Biological Activity of A 1,2,4-Triazole Compound

WEI KE; NA-BO SUN; HONG-KE WU (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-08-09)

The title compound (C₁₇H₁₄F₂N₄SO) were synthesized and recrystallized from CH₃CN. The compound was characterized by ¹H-NMR, FTIR, MS, HRMS and X-ray diffraction. The compound crystallized in the Monoclinic space group C2/c ...
Molten Salt Synthesis of Iron Oxide Modified Attapulgite for Catalytic Oxidation of Elemental Mercury

Yu Lu; Jing Ling, Shao; Hui Cang; Fen Nv Han; Zhi Dong, Chen; Qi Xu (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

IIron oxide modified attapulgite (Fe₂O₃-ATP) catalysts, with special network structure, were prepared by molten salt method, and were applied to investigate Hg⁰ oxidation ability in simulated flue gas from 100 to 260°C. ...
New Antibacterial Diazotized Derivatives of 5-Amino Azaheterocycles

Humaira Yasmeen Gondal; Muhammad Ali (HEJ Research Institute of Chemistry, University of Karachi, Karachi., 2013-10-20)

Six new diazotized derivatives of pharmacologically important azaheterocycles (2a-d, 4a-b) were prepared from their corresponding 5-amino benzimidazoles (1a-d) and benzimidazolones (3a-b). All new compounds have been ...

Now showing items 1-20 of 59

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