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Modeling of Polyamide 66 Solid State Polymerization: Drawing a Chemical Reaction Scheme

13-11-2014 | Viviane Filgueiras, Stamatina N. Vouyiouka, Maria O. Konstantakopoulou, Anastasia C. Boussia, Constantine D. Papaspy ..., Macromolecular Reaction Engineering, 2014

Abstract A chemical reaction scheme is proposed here to describe the polyamide 66 (PA 66) solid state polymerization (SSP) with effective kinetic parameters. The main objective of the suggested model is to predict the maximum molecular weight attainable at each SSP isotherm, which is in turn ...

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Ionic‐liquid‐based, manual‐shaking‐ and ultrasound‐assisted, surfactant‐enhanced emulsification microextraction for the determination of three fungicide residues in juice samples

13-11-2014 | Xiaochu Chen, Xiangwei You, Fengmao Liu, Fan Hou, Xu Zhang, Journal of Separation Science, 2014

A novel manual shaking and ultrasound‐assisted surfactant‐enhanced emulsification microextraction method was developed for the determination of three fungicides in juice samples. In this method, the ionic liquid, 1‐ethyl‐3‐methylimidazolium bis[(trifluoromethyl)sulfonyl]imide, instead of a ...

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Evaluation of the combination of a dispersive liquid‐liquid microextraction method with micellar electrokinetic chromatography coupled to mass‐spectrometry for the determination of estrogenic compounds in milk and yogurt

13-11-2014 | Giovanni D'Orazio, María Asensio‐Ramos, Javier Hernández‐Borges, Miguel Ángel Rodríguez‐Delgado, Salvatore Fanali, ELECTROPHORESIS, 2014

In this work, the suitability of a methodology based on dispersive liquid‐liquid microextraction (DLLME) has been evaluated for the extraction of four endoestrogens (estriol, 17α‐estradiol, 17β‐estradiol and estrone), an exoestrogen (17α‐etynylestradiol) and a mycotoxin (zearalenone), together ...

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Application of the Zr/Hf Ratio in the Determination of Hafnium in Geochemical Samples by High-Resolution Inductively Coupled Plasma Mass Spectrometry

12-11-2014 | Ya Xuan Liu; Qing Xia Li; Na Ma; Xiao Ling Sun; Jin Feng Bai; Qin Zhang, Analytical Chemistry, 2014

Hafnium content and its change are of significance in geochemistry and cosmochemistry; however, the determination of hafnium has always been problematic in analytical chemistry. In this paper, a new idea is proposed for the determination of hafnium in geochemical samples, including rocks, soils, ...

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Voltammetric Determination of 2‐Aminofluoren‐9‐one and Investigation of Its Interaction with DNA on a Glassy Carbon Electrode

11-11-2014 | Andrea Hájková, Jiří Barek, Vlastimil Vyskočil, Electroanalysis, 2014

Abstract Voltammetric behavior of the genotoxic environmental pollutant 2‐aminofluoren‐9‐one (2‐AFN) was investigated using direct current voltammetry (DCV) and differential pulse voltammetry (DPV) at a glassy carbon electrode (GCE) in both negative and positive potential regions. For the ...

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Determination of human albumin in serum and urine samples by constant‐energy synchronous fluorescence method

07-11-2014 | Tayyebeh Madrakian, Habibollah Bagheri, Abbas Afkhami, Luminescence, 2014

ABSTRACT A sensitive spectrofluorimetric method using constant‐energy synchronous fluorescence technique is proposed for the determination of human albumin without separation. In this method, no reagent was used for enhancement of the fluorescence signal of albumin in the solution. Effects of ...

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Ovine β‐lactoglobulin at atomic resolution

05-11-2014 | George Kontopidis, Anna Nordle Gilliver, Lindsay Sawyer, Acta Crystallographica Section F, 2014

The crystal structure of the triclinic form of the milk protein β‐lactoglobulin from sheep (Ovis aries) at 1.1 Å resolution is described together with a comparison of the triclinic structures of the low‐pH bovine and high‐pH ovine proteins. All three structures are remarkably similar, despite ...

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The structure of rice weevil pectin methylesterase

05-11-2014 | David C. Teller, Craig A. Behnke, Kirk Pappan, Zicheng Shen, John C. Reese, Gerald R. Reeck, Ronald E. Stenkamp, Acta Crystallographica Section F, 2014

Rice weevils (Sitophilus oryzae) use a pectin methylesterase (EC 3.1.1.11), along with other enzymes, to digest cell walls in cereal grains. The enzyme is a right‐handed β‐helix protein, but is circularly permuted relative to plant and bacterial pectin methylesterases, as shown by the crystal ...

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Studying the Interactions of Polyethylene with Graphite in the Presence of Solvent by High Temperature Thermal Gradient Interactive Chromatography, Thermal Gradient Nuclear Magnetic Resonance Spectroscopy, and Solution Differential Scanning Calorimetry

05-11-2014 | D. Mekap; F. Malz; R. Brüll; Z. Zhou; R. Cong; A. W. deGroot; A. R. Parrott, Macromolecules, 2014

High temperature thermal gradient interactive chromatography (HT-TGIC or TGIC) has emerged as an important analytical tool to determine the comonomer content distribution (CCD) present in copolymers of polyethylene (PE). The method separates the macromolecules according to the differences in ...

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Online Photochemical Vapour Generation of Inorganic Tin for Inductively Coupled Plasma Mass Spectrometric Detection

04-11-2014 | Hualing Duan; Zhenbin Gong; Shifeng Yang, Journal of Analytical Atomic Spectrometry, 2014

Photochemical vapour generation (PCVG) as sample introduction technique was adopted for the quantitative determination of trace levels of inorganic tin with inductively coupled plasma mass spectrometry (ICPMS) for the first time. Volatile tin species could be generated online when a solution of ...

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