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Modeling of removal of an organophosphorus pesticide from aqueous solution by amagnetic metal–organic framework composite

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Chinese Journal of Chemical Engineering 2021年第12期34卷 323-335页

作者： Abdolraouf Samadi-Maybodi Mohsen Nikou analytical division Faculty of ChemistryUniversity of MazandaranBabolsarIran

Today,a variety of pesticides are used to fight plant pests in the *** entry of these resistant pollutants into water resources can have devastating effects on human health and the environment,hence their removal from the environment is a vital *** the present work,the magnetic iron-based metalorganic framework(Fe_(3) O_(4)/MIL-101(Fe)) was synthesized by a simple and feasible method and characterized by FT-IR,XRD,BET,FESEM,TEM,TGA,and VSM *** synthesized nanocom posite was successfully applied for the removal of fenitrothion(FEN) pesticide from the aqueous *** isothermal and kinetic models were also *** Langmuir isotherm model(type I) and pseudo-second-order kinetic model were more consistent in the adsorption *** thermodynamic parameters of fenitrothion sorption were also *** results revealed that the adsorption of fenitrothion onto Fe_(3) O_(4)/MIL-101(Fe) was spontaneous and endothermic under optimized ***,the removal efficiency of FEN was predicted using the developed fuzzy logic *** input variables including the initial concentration of FEN(mg·L^(-1)),pH of the solution,adsorbent dosage(mg).and contact time(min) versus removal efficiency as output were fuzzified by the usage of an artificial intelligence-based *** fuzzy subsets consisted of Triangular and Trapezoidal membership functions(MFs) with six levels and a total of 23 rules in IF-THEN format which was applied on a Mamdani inference *** obtained coefficient of determination value(R_(pred)^(2)=0.98205) proved the excellent accuracy of the fuzzy logic model as a powerful tool for the prediction of FEN removal efficiency.

关键词： Fenitrothion Magnetic iron-based metal–organic framework Fuzzy logic Adsorption Isotherm Mamdani

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Eco-friendly reduced graphene oxide for the determination of mycophenolate mofetil in pharmaceutical formulations

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Journal of Pharmaceutical Analysis 2018年第2期8卷 131-137页

作者： Prashanth S.Narayan Nagappa L.Teradal Seetharamappa Jaldappagari Ashis K.Satpati Department of chemistry Karnatak University analytical chemistry division Bhabha Atomic Research Centre

Graphene oxide(GO) was synthesized and characterized by scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDX), atomic force microscopy(AFM), X-ray diffraction(XRD), Fourier transform-infrared spectroscopy(FT-IR) and thermogravimetric analysis(TGA). GO was then electrochemically reduced and used for electrochemical study of mycophenolate mofetil(MMF). The electrochemically reduced graphene oxide(ERGO) film on glassy carbon electrode(GCE) showed enhanced peak current for electrooxidation of MMF. MMF exhibited two irreversible oxidation peaks at 0.84 V(peak a_1)and 1.1 V(peak a_2). Effects of accumulation time, pH and scan rate were studied and various electrochemical parameters were calculated. A differential pulse voltammetric method was developed for the determination of MMF in bulk samples and pharmaceutical formulations. Linear relationship was observed between the peak current and concentration of MMF in the range of 40 nM–15 μM with a limit of detection of 11.3 nM. The proposed method is simple, sensitive and inexpensive and, hence, could be readily adopted in clinical and quality control laboratories.

关键词： Mycophenolate mofetil Electroreduced graphene oxide Electrochemical sensor analytical application

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Fabrication of the electrochemically reduced graphene oxide-bismuth nanoparticles composite and its analytical application for an anticancer drug gemcitabine

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Chinese Chemical Letters 2017年第7期28卷 1429-1437页

作者： Ranjita Tandel Nagappa Teradal Ashis Satpati Seetharamappa Jaldappagari Department of chemistry Karnatak University analytical chemistry division Bhabha Atomic Research Center

The present study explores an electroreduced graphene oxide-bismuth nanoparticles composite（ErGOBi） as an electrochemical sensor for the determination of an anticancer drug, gemcitabine hydrochloride（GMB）. The Er-GOBi interface was prepared by drop casting of bismuth nitrate-graphene oxide suspension on a glassy carbon electrode（GCE） followed by electro-reduction in the potential range of 0.6 V to 1.7 V. SEM, FTIR, EDAX and AFM techniques were employed for the characterization of prepared materials. Cyclic voltammetric and electrochemical impedance spectroscopic methods were used to understand the charge transfer properties of stepwise modification of Er-GOBi/GCE. GMB exhibited an irreversible oxidation peak at 1.144 V on Er-GOBi/GCE in phosphate buffer of p H 3. A 100-fold enhanced oxidation peak current was observed at Er-GOBi/GCE when compared to that at bare *** performance of Er GO-Bi/GCE was optimized by varying peak current dependent *** relationship between the peak current and concentration of GMB was observed in the range of 0.1–51.1 mmol/L in differential pulse voltammetric method and 2.1–61.1 mmol/L in linear sweep voltammetric method. The practical utility of the proposed sensor, Er-GOBi/GCE was demonstrated by determining GMB in pharmaceutical formulations and spiked urine samples.

关键词： Gemcitabine Nanocomposite Electrochemical sensor Pharmaceutical formulations Graphene oxide

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Hydroxyapatites enriched in silicon-Bioceramic materials for biomedical and pharmaceutical applications

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Progress in Natural Science:Materials International 2017年第4期27卷 401-409页

作者： Katarzyna Szurkowska Joanna Kolmas Medical University of Warsaw Faculty of Pharmacy with Laboratory Medicine Division Department of Inorganic and Analytical Chemistry

Hydroxyapatite ((Ca10（PO4）)6（OH）2, abbreviated as HA) plays a crucial role in implantology, dentistry and bone surgery. Due to its considerable similarity to the inorganic fraction of the mineralized tissues（bones, enamel and dentin）, it is used as component in many bone substitutes, coatings of metallic implants and dental materials. Biomaterial engineering often takes advantage of HA capacity for partial ion substitution because the incorporation of different ions in the HA structure leads to materials with improved biological or physicochemical properties. The objective of the work is to provide an overview of current knowledge about apatite materials substituted with silicon ions. Although the exact mechanism of action of silicon in the bone formation process has not been fully elucidated, research has shown beneficial effects of this element on bone matrix mineralization as well as on collagen type I synthesis and stabilization. The paper gives an account of the functions of silicon in bone tissue and outlines the present state of research on synthetic HA containing silicate ions（Si-HA）. Finally, methods of HA production as well as potential and actual applications of HA materials modified with silicon ions are discussed.

关键词： Hydroxyapatite Silicon Biomaterials Ionic substitution Bioceramics

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Methylated and thiolated arsenic species for environmental and health research——A review on synthesis and characterization

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Journal of Environmental Sciences 2016年第11期28卷 7-27页

作者： William R.Cullen Qingqing Liu Xiufen Lu Anthony McKnight-Whitford Hanyong Peng Aleksandra Popowich Xiaowen Yan Qi Zhang Michael Fricke Hongsui Sun X.Chris Le Department of chemistry University of British Columbia division of analytical and Environmental Toxicology Department of Laboratory Medicine and Pathology University of Alberta Department of chemistry University of Alberta

Hundreds of millions of people around the world are exposed to elevated concentrations of inorganic and organic arsenic compounds, increasing the risk of a wide range of health effects. Studies of the environmental fate and human health effects of arsenic require authentic arsenic compounds. We summarize here the synthesis and characterization of more than a dozen methylated and thiolated arsenic compounds that are not commercially available. We discuss the methods of synthesis for the following14 trivalent（Ⅲ） and pentavalent（） arsenic compounds： monomethylarsonous acid（MMA~Ⅲ）, dicysteinylmethyldithioarsenite（MMA~Ⅲ（Cys）_2）, monomethylarsonic acid（MMA~Ⅴ）,monomethylmonothioarsonic acid（MMMTAⅤ） or monothio-MMA~Ⅴ, monomethyldithioarsonic acid（MMDTA~Ⅴ） or dithio-MMA~Ⅴ, monomethyltrithioarsonate（MMTTA~Ⅴ） or trithio-MMA~Ⅴ,dimethylarsinous acid（DMA~Ⅲ）, dimethylarsino-glutathione（DMA~Ⅲ（SG））, dimethylarsinic acid（DMA~Ⅴ）, dimethylmonothioarsinic acid（DMMTA~Ⅴ） or monothio-DMAⅤ, dimethyldithioarsinic acid（DMDTA~Ⅴ） or dithio-DMA~Ⅴ, trimethylarsine oxide（TMAO~Ⅴ）, arsenobetaine（AsB）, and an arsenicin-A model compound. We have reviewed and compared the available methods,synthesized the arsenic compounds in our laboratories, and provided characterization information. On the basis of reaction yield, ease of synthesis and purification of product, safety considerations, and our experience, we recommend a method for the synthesis of each of these arsenic compounds.

关键词： Arsenic standards Speciation analysis Arsenic metabolites Sulphur-containing arsenic species Synthetic chemistry of arsenic Pentavalent and trivalent methylarsenicals

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Benefits and risks associated with consumption of Great Lakes fish containing omega-3 fatty acids and polychlorinated biphenyls(PCBs)

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Journal of Environmental Sciences 2016年第3期28卷 1-5页

作者： Rebecca E.Paliwoda Ashley M.Newbigging Zhixin Wang X.Chris Le Department of chemistry University of Alberta division of analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of Alberta

Introduction Assessment of environmental health effects arising from exposure to multiple substances is often very *** is particularly true when humans are exposed to a mixture that contains both beneficial and harmfu... 详细信息

关键词： Environmental epidemiology Polychlorinated biphenyls(PCBs) Omega-3 fatty acids Thyroid cancer Dietary exposure Food contamination New York fishermen

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Optimization and validation of a fast RP-HPLC method for the determination of dobutamine in rat plasma:Pharmacokinetic studies in healthy rat subjects

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Journal of Pharmaceutical Analysis 2013年第6期3卷 434-439页

作者： Ramesh Thippani Nageswara Rao Pothuraju Nageswara Rao Ramisetti Saida Shaik Department of chemistry National Institute of Technology analytical chemistry division IICT

A novel isocratic reverse phase high performance liquid chromatography （RP-HPLC） with photo diode array （PDA） detection method for the determination of dobutamine （DBT） in rat plasma was developed and validated after optimization of various chromatographic conditions and other experimental parameters. Homoveratrylamiue was used as an internal standard. Methanol was used as the extracting solvent for the preparation of plasma samples. Samples were separated on a Symmetry C18 （250ram x4.6mm i.d., 5 pro） analytical column. Acetonitrile and 15raM potassium dihydrogen phosphate （pH 5.0 with 0.3% TEA）（20：80, v/v） was used. The column oven temperature was optimized at 35 ~C and the flow rate was 0.8 mL/min. The detection wavelength was fixed at 230 nm for entire analysis. The calibration curve was found to be linear over the concentration range of 50-2000 ng/mL （ra=0.9992）. The limit of quantification （LOQ） of the method was 50 ng/mL. The % RSD values of accuracy and precision values for intra and inter days were 〈 15% at quality control （QC） concentrations. Recovery, stability and robustness were studied within the acceptable range according to ICH guidelines. The method was efficiently applied to a pharmacokinetic study in healthy Wistar rats.

关键词： Dobutamine RP-HPLC Validation Rat plasma Pharmacokinetics

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Arsenobetaine:the ongoing mystery

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National Science Review 2016年第4期3卷 451-458页

作者： Aleksandra Popowich Qi Zhang X.Chris Le Department of chemistry University of Alberta division of analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of Alberta

Arsenobetaine(As B) is a non-toxic organoarsenical identiied as a major arsenic species in marine animals and a number of terrestrial *** its irst identiication nearly 40 years ago,numerous studies investigating the biosynthesis and function of As B have been carried out,although molecular mechanisms have not been fully *** and how is As B formed? Why do marine animals acquire high concentrations of As B? his review briely summarizes the current progress of As B research toward understanding its origin,function and the putative pathways for its *** paper also suggests potential future studies in the atempt to solve the As B mystery.

关键词： arsenic arsenobetaine arsenocholine arsenosugars biosynthesis arsenic metabolism speciation

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Composition and Physico-Chemical Properties of Meat from Capons Fed Cereals

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Journal of Integrative Agriculture 2013年第11期12卷 1953-1960页

作者： Olga Díaz Luisana Rodríguez Alexandr Torres ngel Cobos Food Technology division Department of Analytical ChemistryNutrition and Food ScienceFaculty of SciencesUniversity of Santiago de Compostela

Chemical composition, physico-chemical properties and fatty acid composition of breast and drumstick meat from capons （castrated male cockerels） fed cereals were studied. Three groups of capons were reared. One group was fed ad libitum the same commercial diet until the 4th mon of life. The last month of its life, the capons of this group were fed corn. The second and third group of capons were fed the same diet from caponization. The second group was fed mixture of corn （50%） and wheat （50%）. The third group of capons was fed 2/3 corn and 1/3 mixture of corn （50%） and barley （50%）. Capons were reared under free-range conditions and slaughtered at 150 d of age. Caponization was performed at 48 d. No signiifcant effects of feeding in chemical composition, pH, water holding capacity, drip and cooking losses and texture of the meat were observed. The meat of the third group （capons fed 83%corn） was more yellow and showed higher content of C18：2 than that of the other capons.

关键词： castrated male cockerel feeding meat quality fatty acids

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以方沸石负载Ni(Ⅱ)催化剂修饰的电极电氧化甲醇(英文)

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催化学报 2014年第3期35卷 383-390页

作者： Seyed Naser Azizi Shahram Ghasemi Neda Salek Gilani analytical division Faculty of ChemistryUniversity of Mazandaran Faculty of chemistry University of Mazandaran

There is a high overvoltage in the oxidation of methanol in fuel cells,and so modified electrodes are used to decrease it.A modified electrode that used Ni(II) loaded analcime zeolite to catalyze the electrooxidation of methanol in alkaline solution was *** zeolite was synthesized by hydrothermal synthesis,and Ni(II) ions were incorporated into the analcime structure,which was then mixed with carbon paste to prepare modified *** electrocatalytic oxidation of methanol on the surface of the modified electrode in alkaline solution was investigated by cyclic voltammetry and *** effects of the scan rate of the potential,concentration of methanol,and amount of zeolite were *** rate constant for the catalytic reaction of methanol was 6 × 103 cm3 mol-1 s-1 from measurements using *** proposed electrode significantly improved the electron transfer rate and decreased the overpotential for methanol oxidation.

关键词：甲醇燃料电池沸石催化剂修饰电极 Ni 电氧化方沸石沸石分子筛改性电极

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