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Analytical and Bioanalytical Chemistry

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https://www.readbyqxmd.com/read/28527002/design-and-development-of-amperometric-biosensor-for-the-detection-of-lead-and-mercury-ions-in-water-matrix-a-permeability-approach
#1
Manju Bhargavi Gumpu, Uma Maheswari Krishnan, John Bosco Balaguru Rayappan
Intake of water contaminated with lead (Pb(2+)) and mercury (Hg(2+)) ions leads to various toxic effects and health issues. In this context, an amperometric urease inhibition-based biosensor was developed to detect Pb(2+) and Hg(2+) ions in water matrix. The modified Pt/CeO2/urease electrode was fabricated by immobilizing CeO2 nanoparticles and urease using a semi-permeable adsorption layer of nafion. With urea as a substrate, urease catalytic activity was examined through cyclic voltammetry. Further, maximum amperometric inhibitive response of the modified Pt/CeO2/urease electrode was observed in the presence of Pb(2+) and Hg(2+) ions due to the urease inhibition at specific potentials of -0...
May 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28527001/the-relative-abundance-of-dimethylsulfoniopropionate-dmsp-among-other-zwitterions-in-branching-coral-at-heron-island-southern-great-barrier-reef
#2
Hilton B Swan, Elisabeth S M Deschaseaux, Graham B Jones, Bradley D Eyre
Dimethylsulfoniopropionate (DMSP) and eleven other target zwitterions were quantified in the branch tips of six Acropora species and Stylophora pistillata hard coral growing on the reef flat surrounding Heron Island in the southern Great Barrier Reef (GBR), Australia. Hydrophilic interaction liquid chromatography mass spectrometry (HILIC-MS) was used for sample analysis with isotope dilution MS applied to quantify DMSP. The concentration of DMSP was ten times greater in A. aspera than A. valida, with this difference being maintained throughout the spring, summer and winter seasons...
May 20, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28527000/fluorescent-coelenteramide-containing-protein-as-a-color-bioindicator-for-low-dose-radiation-effects
#3
Alena S Petrova, Anna A Lukonina, Gennadii A Badun, Nadezhda S Kudryasheva
The study addresses the application of fluorescent coelenteramide-containing proteins as color bioindicators for radiotoxicity evaluation. Biological effects of chronic low-dose radiation are under investigation. Tritiated water (200 MBq/L) was used as a model source of low-intensive ionizing radiation of beta type. 'Discharged obelin,' product of bioluminescent reaction of marine coelenterate Obelia longissimi, was used as a representative of the coelenteramide-containing proteins. Coelenteramide, fluorophore of discharged obelin, is a photochemically active molecule; it produces fluorescence forms of different color...
May 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28526999/solid-film-sampling-method-for-the-determination-of-protein-secondary-structure-by-fourier-transform-infrared-spectroscopy
#4
Junting Zhang, Xiaoning Zhang, Fan Zhang, Shaoning Yu
Fourier transform infrared (FTIR) spectroscopy is one of the widely used vibrational spectroscopic methods in protein structural analysis. The protein solution sample loaded in demountable CaF2 liquid cell presents a challenge and is limited to high concentrations. Some researchers attempted the simpler solid-film sampling method for the collection of protein FTIR spectra. In this study, the solid-film sampling FTIR method was studied in detail. The secondary structure components of some globular proteins were determined by this sampling method, and the results were consistent with those data determined by the traditional solution sampling FTIR method and X-ray crystallography, indicating that this sampling method is feasible and efficient for the structural characterization of proteins...
May 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28526998/fritz-scholz-uwe-schr%C3%A3-der-rubin-gulaboski-and-antonio-dom%C3%A3-nech-carb%C3%A3-electrochemistry-of-immobilized-particles-and-droplets-experiments-with-three-phase-electrodes-2nd-ed
#5
https://www.readbyqxmd.com/read/28516281/tof-sims-study-of-differentiation-of-human-bone-derived-stromal-cells-new-insights-into-osteoporosis
#6
Kaija Schaepe, Janina Werner, Kristina Glenske, Tessa Bartges, Anja Henss, Marcus Rohnke, Sabine Wenisch, Jürgen Janek
Lipids have numerous important functions in the human body, as they form the cells' plasma membranes and play a key role in many disease states, presumably also in osteoporosis. Here, the fatty acid composition of the outer plasma membranes of cells differentiated into the osteogenic and adipogenic direction is studied with surface-sensitive time-of-flight secondary ion mass spectrometry (ToF-SIMS). For data evaluation, principal component analysis (PCA) is applied. Human (bone-derived) mesenchymal stromal cells (hMSCs) from an osteoporotic donor and a control donor are compared to reveal differences in the fatty acid composition of the membranes...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516280/optimization-of-an-ultrasound-assisted-derivatization-for-gc-ms-analysis-of-oxygenated-organic-species-in-atmospheric-aerosol
#7
Maria Chiara Pietrogrande, Francesco Manarini, José Benito Quintana, Rosario Rodil, Eugenia Villaverde-de-Sáa, Marco Visentin
A novel ultrasound-assisted derivatization followed by GC/MS analysis was developed for the quantification of oxygenated organic species in ambient aerosol. Derivatization parameters mostly influencing the analytical response were investigated, i.e., solvent type, reagent concentration, and reaction duration. Response surface methodology was used to design experiments and a quadratic model was utilized to predict the variables and establish the optimal conditions. The study was performed on standard solutions of 30 compounds representing the major classes of oxygenated compounds typically found in ambient aerosol, i...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516279/a-new-carbon-based-magnetic-material-for-the-dispersive-solid-phase-extraction-of-uv-filters-from-water-samples-before-liquid-chromatography-tandem-mass-spectrometry-analysis
#8
Susy Piovesana, Anna Laura Capriotti, Chiara Cavaliere, Giorgia La Barbera, Roberto Samperi, Riccardo Zenezini Chiozzi, Aldo Laganà
Magnetic solid-phase extraction is one of the most promising new extraction methods for liquid samples before ultra-high-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) analysis. Several types of materials, including carbonaceous ones, have been prepared for this purpose. In this paper, for the first time, the preparation, characterization, and sorption capability of Fe3O4-graphitized carbon black (mGCB) composite toward some compounds of environmental interest were investigated. The synthesized mGCB consisted of micrometric GCB particles with 55 m(2) g(-1) surface area bearing some carbonyl and hydroxyl functionalities and the surface partially decorated by Fe3O4 microparticles...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516278/molecularly-imprinted-polymers-based-stir-bar-sorptive-extraction-for-determination-of-cefaclor-and-cefalexin-in-environmental-water
#9
Jun Peng, Donghao Liu, Tian Shi, Huairu Tian, Xuanhong Hui, Hua He
Although stir bar sportive extraction was thought to be a highly efficiency and simple pretreatment approach, its wide application was limited by low selectivity, short service life, and relatively high cost. In order to improve the performance of the stir bar, molecular imprinted polymers and magnetic carbon nanotubes were combined in the present study. In addition, two monomers were utilized to intensify the selectivity of molecularly imprinted polymers. Fourier transform infrared spectroscopy, scanning electron microscopy, and selectivity experiments showed that the molecularly imprinted polymeric stir bar was successfully prepared...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516277/analysis-of-cellular-autofluorescence-in-touch-samples-by-flow-cytometry-implications-for-front-end-separation-of-trace-mixture-evidence
#10
M Katherine Philpott, Cristina E Stanciu, Ye Jin Kwon, Eduardo E Bustamante, Susan A Greenspoon, Christopher J Ehrhardt
The goal of this study was to survey optical and biochemical variation in cell populations deposited onto a surface through touch or contact and identify specific features that may be used to distinguish and then sort cell populations from separate contributors in a trace biological mixture. Although we were not able to detect meaningful biochemical variation in touch samples deposited by different contributors through preliminary antibody surveys, we did observe distinct differences in red autofluorescence emissions (650-670 nm), with as much as a tenfold difference in mean fluorescence intensities observed between certain pairs of donors...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28512717/infrared-laser-ablation-sample-transfer-of-tissue-dna-for-genomic-analysis
#11
Kelin Wang, Fabrizio Donnarumma, Scott W Herke, Patrick F Herke, Kermit K Murray
Infrared (IR) laser ablation was used to remove material from tissue sections mounted on microscope slides, with subsequent capture in a solvent-containing microcentrifuge tube. Experiments conducted with a 3200-bp double-stranded plasmid DNA template demonstrated IR-laser ablation transfer of intact DNA. The transfer efficiency and the molecular integrity of the captured DNA were evaluated using Sanger sequencing, gel electrophoresis, and fluorimetric analysis. The plasmid DNA was reproducibly transferred with an efficiency of 59 ± 3% at laser fluences of between 10 and 20 kJ/m(2) at a wavelength of 3 μm...
May 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28512716/clint-m-alfaro-wins-abc-best-paper-award
#12
EDITORIAL
Nicola Oberbeckmann-Winter
No abstract text is available yet for this article.
May 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28508925/using-maldi-tof-ms-imaging-and-lc-hrms-for-the-investigation-of-the-degradation-of-polycaprolactone-diol-exposed-to-different-wastewater-treatments
#13
Daniel Rivas, Bozo Zonja, Peter Eichhorn, Antoni Ginebreda, Sandra Pérez, Damià Barceló
Polymers are used in high amounts in a wide range of applications from biomedicine to industry. Because of the growing awareness of the increasing amounts of plastic wastes in the aquatic environment during recent years, the evaluation of their biodegradability deserves special attention. In the past, most efforts were dedicated to studying the biodegradation of polyesters in soil and compost, while very little research has been conducted on their fate in wastewater. Here, we assessed the ability of bacterial communities residing in the aerobic and denitrification tank from a wastewater treatment plant (WWTP) to degrade the polymeric ester polycaprolactone diol (PCLD; average molecular weight of 1250 Da)...
May 16, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28508088/characterization-of-the-molar-mass-distribution-of-macromolecules-in-beer-for-different-mashing-processes-using-asymmetric-flow-field-flow-fractionation-af4-coupled-with-multiple-detectors
#14
Jaeyeong Choi, Claudia Zielke, Lars Nilsson, Seungho Lee
The macromolecular composition of beer is largely determined by the brewing and the mashing process. It is known that the physico-chemical properties of proteinaceous and polysaccharide molecules are closely related to the mechanism of foam stability. Three types of "American pale ale" style beer were prepared using different mashing protocols. The foam stability of the beers was assessed using the Derek Rudin standard method. Asymmetric flow field-flow fractionation (AF4) in combination with ultraviolet (UV), multiangle light scattering (MALS) and differential refractive index (dRI) detectors was used to separate the macromolecules present in the beers and the molar mass (M) and molar mass distributions (MD) were determined...
May 15, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28500372/ion-mobility-mass-spectrometry-as-a-tool-to-investigate-protein-ligand-interactions
#15
REVIEW
Melanie Göth, Kevin Pagel
Ion mobility-mass spectrometry (IM-MS) is a powerful tool for the simultaneous analysis of mass, charge, size, and shape of ionic species. It allows the characterization of even low-abundant species in complex samples and is therefore particularly suitable for the analysis of proteins and their assemblies. In the last few years even complex and intractable species have been investigated successfully with IM-MS and the number of publications in this field is steadily growing. This trend article highlights recent advances in which IM-MS was used to study protein-ligand complexes and in particular focuses on the catch and release (CaR) strategy and collision-induced unfolding (CIU)...
May 13, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28493022/in-vitro-anti-thrombotic-and-anti-coagulant-properties-of-blacklip-abalone-haliotis-rubra-viscera-hydrolysate
#16
Hafiz Ansar Rasul Suleria, Paul P Masci, Rama Addepalli, Wei Chen, Glenda C Gobe, Simone A Osborne
Abalone viscera contain sulphated polysaccharides with anti-thrombotic and anti-coagulant activities. In this study, a hydrolysate was prepared from blacklip abalone (Haliotis rubra) viscera using papain and bromelain and fractionated using ion exchange and size exclusion chromatography. Hydrolysates and fractions were investigated for in vitro thrombin inhibition mediated through heparin cofactor II (HCII) as well as anti-coagulant activity in plasma and whole blood. On the basis of sulphated polysaccharide concentration, the hydrolysate inhibited thrombin through HCII with an inhibitor concentration at 50% (IC50) of 16...
May 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28493021/cobalt-oxyhydroxide-nanoflakes-with-intrinsic-peroxidase-catalytic-activity-and-their-application-to-serum-glucose-detection
#17
Yu-Min Wang, Jin-Wen Liu, Jian-Hui Jiang, Wenwan Zhong
Cobalt oxyhydroxide (CoOOH) nanoflakes, an emerging type of two-dimensional nanomaterial, show great potential for use in molecular detection. Previous assays utilizing such materials have largely been based on their outstanding fluorescence quenching ability and oxidizing power. Herein, we report the intrinsic peroxidase-like activity of cobalt oxyhydroxide (CoOOH) nanoflakes, and we show how this activity can be employed for glucose detection. We found that, in the presence of hydrogen peroxide (H2O2), the nanoflakes accelerated the conversion of peroxidase substrates such as 3,3',5,5'-tetramethylbenzidine (TMB) into colored products...
May 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28493020/development-and-validation-of-an-analytical-method-based-on-liquid-chromatography-tandem-mass-spectrometry-detection-for-the-simultaneous-determination-of-13-relevant-wastewater-derived-contaminants-in-lettuce
#18
Nicola Montemurro, Cristina Postigo, Antonio Lonigro, Sandra Perez, Damià Barceló
We present an analytical method developed and validated to study the potential uptake of 13 selected drugs (ten pharmaceuticals, one illicit drug, and two transformation products) into lettuce plants from contaminated water and soil. Some of the selected drugs (i.e., cocaine, methadone, cis-diltiazem, valsartan, and valsartan acid), which are commonly present in treated wastewater, were investigated for the first time in plant tissues. The method is based on ultrasonic solvent extraction with acetonitrile-methanol (1:1, v/v) and subsequent automated extract cleanup and analysis by means of online solid-phase extraction-liquid chromatography-tandem mass spectrometry...
May 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28484810/improving-repeatability-of-capillary-electrophoresis-a-critical-comparison-of-ten-different-capillary-inner-surfaces-and-three-criteria-of-peak-identification
#19
Paweł Mateusz Nowak, Michał Woźniakiewicz, Marta Gładysz, Magdalena Janus, Paweł Kościelniak
A poor repeatability of migration times caused by the fluctuations of electroosmotic flow (EOF) is an inherent weakness of capillary electrophoresis. Most researchers endeavor to prevent this problem using relative migration times or various capillary coatings which are expensive and not easy in comparison. Herein, we present an original approach to this problem: we apply a model sample designed to induce significant EOF instability, in order to critically compare ten capillary types with different physicochemical characteristics...
May 8, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28484809/novel-fast-analytical-method-for-indirect-determination-of-mcpd-fatty-acid-esters-in-edible-oils-and-fats-based-on-simultaneous-extraction-and-derivatization
#20
Renata Jędrkiewicz, Agnieszka Głowacz-Różyńska, Justyna Gromadzka, Piotr Konieczka, Jacek Namieśnik
A novel method for indirect determination of MCPD esters levels in lipid samples has been developed. The method is based on combination of extraction and derivatization in the same sample preparation step. It is achieved by the application of diethyl ether as extraction solvent for isolation of analytes released from esterified forms from the water phase and as dilution solvent for solid PBA - the derivatization agent. It is a noteworthy improvement of recommended indirect approaches available in the literature because such steps as sample clean-up, multiple liquid-liquid extractions, and preconcentration are excluded in the proposed solution...
May 8, 2017: Analytical and Bioanalytical Chemistry
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