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Analytical chemistry

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https://www.readbyqxmd.com/read/28102384/predicting-point-defect-equilibria-across-oxide-hetero-interfaces-model-system-of-zro2-cr2o3
#1
Jing Yang, Mostafa Youssef, Bilge Yildiz
We present a multi-scale approach to predict equilibrium defect concentrations across oxide/oxide hetero-interfaces. There are three factors that need to be taken into account simultaneously for computing defect redistribution around the hetero-interfaces: the variation of local bonding environment at the interface as epitomized in defect segregation energies, the band offset at the interface, and the equilibration of the chemical potentials of species and electrons via ionic and electronic drift-diffusion fluxes...
January 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28092796/global-open-data-management-in-metabolomics
#2
REVIEW
Kenneth Haug, Reza M Salek, Christoph Steinbeck
Chemical Biology employs chemical synthesis, analytical chemistry and other tools to study biological systems. Recent advances in both molecular biology such as next generation sequencing (NGS) have led to unprecedented insights towards the evolution of organisms' biochemical repertoires. Because of the specific data sharing culture in Genomics, genomes from all kingdoms of life become readily available for further analysis by other researchers. While the genome expresses the potential of an organism to adapt to external influences, the Metabolome presents a molecular phenotype that allows us to asses the external influences under which an organism exists and develops in a dynamic way...
January 13, 2017: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/28092430/optimal-reactivity-and-improved-self-healing-capability-of-structurally-dynamic-polymers-grafted-on-janus-nanoparticles-governed-by-chain-stiffness-and-spatial-organization
#3
Guoxi Xu, Zihan Huang, Pengyu Chen, Tianqi Cui, Xinghua Zhang, Bing Miao, Li-Tang Yan
Structurally dynamic polymers are recognized as a key potential to revolutionize technologies ranging from design of self-healing materials to numerous biomedical applications. Despite intense research in this area, optimizing reactivity and thereby improving self-healing ability at the most fundamental level pose urgent issue for wider applications of such emerging materials. Here, the authors report the first mechanistic investigation of the fundamental principle for the dependence of reactivity and self-healing capabilities on the properties inherent to dynamic polymers by combining large-scale computer simulation, theoretical analysis, and experimental discussion...
January 16, 2017: Small
https://www.readbyqxmd.com/read/28088276/solid-supports-for-extraction-and-preconcentration-of-proteins-and-peptides-in-microfluidic-devices-a-review
#4
REVIEW
Szymon Dziomba, Monica Araya-Farias, Claire Smadja, Myriam Taverna, Benjamin Carbonnier, N Thuy Tran
Determination of proteins and peptides is among the main challenges of today's bioanalytical chemistry. The application of microchip technology in this field is an exhaustively developed concept that aims to create integrated and fully automated analytical devices able to quantify or detect one or several proteins from a complex matrix. Selective extraction and preconcentration of targeted proteins and peptides especially from biological fluids is of the highest importance for a successful realization of these microsystems...
February 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28087127/the-route-from-problem-to-solution-in-multistep-continuous-flow-synthesis-of-pharmaceutical-compounds
#5
Péter Bana, Róbert Örkényi, Klára Lövei, Ágnes Lakó, György István Túrós, János Éles, Ferenc Faigl, István Greiner
Recent advances in the field of continuous flow chemistry allow the multistep preparation of complex molecules such as APIs (Active Pharmaceutical Ingredients) in a telescoped manner. Numerous examples of laboratory-scale applications are described, which are pointing towards novel manufacturing processes of pharmaceutical compounds, in accordance with recent regulatory, economical and quality guidances. The chemical and technical knowledge gained during these studies is considerable; nevertheless, connecting several individual chemical transformations and the attached analytics and purification holds hidden traps...
December 29, 2016: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28080221/molecular-mechanisms-of-antisense-oligonucleotides
#6
Stanley T Crooke
In 1987, when I became interested in the notion of antisense technology, I returned to my roots in RNA biochemistry and began work to understand how oligonucleotides behave in biological systems. Since 1989, my research has focused primarily on this topic, although I have been involved in most areas of research in antisense technology. I believe that the art of excellent science is to frame large important questions that are perhaps not immediately answerable with existing knowledge and methods, and then conceive a long-term (multiyear) research strategy that begins by answering the most pressing answerable questions on the path to the long-term goals...
January 12, 2017: Nucleic Acid Therapeutics
https://www.readbyqxmd.com/read/28078499/carbonaceous-chondrite-meteorites-the-chronicle-of-a-potential-evolutionary-path-between-stars-and-life
#7
Sandra Pizzarello, Everett Shock
The biogenic elements, H, C, N, O, P and S, have a long cosmic history, whose evolution can still be observed in diverse locales of the known universe, from interstellar clouds of gas and dust, to pre-stellar cores, nebulas, protoplanetary discs, planets and planetesimals. The best analytical window into this cosmochemical evolution as it neared Earth has been provided so far by the small bodies of the Solar System, some of which were not significantly altered by the high gravitational pressures and temperatures that accompanied the formation of larger planets and may carry a pristine record of early nebular chemistry...
January 11, 2017: Origins of Life and Evolution of the Biosphere
https://www.readbyqxmd.com/read/28076303/implementation-and-application-of-moving-average-as-continuous-analytical-quality-control-instrument-demonstrated-for-24-routine-chemistry-assays
#8
Huub H van Rossum, Hans Kemperman
BACKGROUND: General application of a moving average (MA) as continuous analytical quality control (QC) for routine chemistry assays has failed due to lack of a simple method that allows optimization of MAs. A new method was applied to optimize the MA for routine chemistry and was evaluated in daily practice as continuous analytical QC instrument. METHODS: MA procedures were optimized using an MA bias detection simulation procedure. Optimization was graphically supported by bias detection curves...
January 11, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28070068/-frontiers-of-vibrational-spectroscopy-in-analytical-chemistry
#9
(no author information available yet)
No abstract text is available yet for this article.
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28069495/surface-modification-of-copolymerized-films-from-three-armed-biodegradable-macromers-an-analytical-platform-for-modified-tissue-engineering-scaffolds
#10
Benno M Müller, Rudi Loth, Peter-Georg Hoffmeister, Friederike Zühl, Liv Kalbitzer, Michael C Hacker, Michaela Schulz-Siegmund
: The concept of macromers allows for a broad adjustment of biomaterial properties by macromer chemistry or copolymerization. Copolymerization strategies can also be used to introduce reactive sites for subsequent surface modification. Control over surface features enables adjustment of cellular reactions with regard to site and object of implantation. We designed macromer-derived polymer films which function as non-implantable analytical substrates for the investigation of surface properties of equally composed scaffolds for bone tissue engineering...
January 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28069235/sonochemical-synthesis-of-novel-pyrano-3-4-e-1-3-oxazines-a-green-protocol
#11
Tamer S Saleh, Abdullah S Al-Bogami, Ahmed E M Mekky, Hamad Z Alkhathlan
The atom-efficient and green protocol for formation of pyrano[3,4-e][1,3]oxazines utilizing dimethyl carbonate under ultrasound irradiation in a presence of KF/basic alumina was reported. We provide a novel series of pyrano[3,4-e][1,3]oxazine derivatives interesting for biological screening tests. In general, it was found that ultrasound irradiations enable the reactions to occur which could not be carried out under silent conditions. These remarkable effects appeared in sonicated reactions can be reasonably interpreted in terms of acoustic cavitation phenomenon...
May 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28068053/surface-modification-of-gold-nanoparticles-with-small-molecules-for-biochemical-analysis
#12
Yiping Chen, Yunlei Xianyu, Xingyu Jiang
As one of the major tools for and by chemical science, biochemical analysis is becoming increasingly important in fields like clinical diagnosis, food safety, environmental monitoring, and the development of chemistry and biochemistry. The advancement of nanotechnology boosts the development of analytical chemistry, particularly the nanoparticle (NP)-based approaches for biochemical assays. Functional NPs can greatly improve the performance of biochemical analysis because they can accelerate signal transduction, enhance the signal intensity, and enable convenient signal readout due to their unique physical and chemical properties...
January 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28067433/plasmonic-imaging-of-the-interfacial-potential-distribution-on-bipolar-electrodes
#13
Meisam Hasheminejad, Yimin Fang, Meng Li, Yingyan Jiang, Wei Wang, Hong-Yuan Chen
Bipolar electrochemistry is based on the gradient distribution of free-electron density along an electrically isolated electrode, which causes a positive electrode potential at one end and a negative potential at the other, allowing for wide applications in analytical chemistry and materials science. To take full advantage of its wireless and high-throughput features, various types of optical probes, such as pH indicators and fluorescence and electrochemiluminescence reagents, have often been used to indirectly monitor the interfacial electron transfer through chromogenic or fluorogenic reactions...
January 9, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28067218/nonlinear-detection-of-secondary-isotopic-chemical-shifts-in-nmr-through-spin-noise
#14
Maria Theresia Pöschko, Victor V Rodin, Judith Schlagnitweit, Norbert Müller, Hervé Desvaux
The detection of minor species in the presence of large amounts of similar main components remains a key challenge in analytical chemistry, for instance, to obtain isotopic fingerprints. As an alternative to the classical NMR scheme based on coherent excitation and detection, here we introduce an approach based on spin-noise detection. Chemical shifts and transverse relaxation rates are determined using only the detection circuit. Thanks to a nonlinear effect in mixtures with small chemical shift dispersion, small signals on top of a larger one can be observed with increased sensitivity as bumps on a dip; the latter being the signature of the main magnetization...
January 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28059423/strategies-for-sensing-neurotransmitters-with-responsive-mri-contrast-agents
#15
Goran Angelovski, Éva Tóth
A great deal of research involving multidisciplinary approaches is currently dedicated to the understanding of brain function. The complexity of physiological processes that underlie neural activity is the greatest hurdle to faster advances. Among imaging techniques, MRI has great potential to enable mapping of neural events with excellent specificity, spatiotemporal resolution and unlimited tissue penetration depth. To this end, molecular imaging approaches using neurotransmitter-sensitive MRI agents have appeared recently to study neuronal activity, along with the first successful in vivo MRI studies...
January 6, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28054632/a-sensitive-three-monoclonal-antibodies-based-automatic-latex-particle-enhanced-turbidimetric-immunoassay-for-golgi-protein-73-detection
#16
Yanyan Xia, Han Shen, Yefei Zhu, Hongpan Xu, Zhiyang Li, Jin Si
Golgi protein 73 (GP73) is a novel and potential marker for diagnosing hepatocellular carcinoma (HCC) that has been found to be abnormally elevated in liver disease. A latex particle-enhanced turbidimetric immunoassay (LTIA) was recently introduced and licensed for application in a variety of automated clinical chemistry analyzers. However, no studies have reported sufficient data on analytical performance of this method when using 3 monoclonal antibodies for GP73 measurement. The experimental conditions were firstly optimized and range of linearity, diagnostic potential, clinical relevance were compared with the LTIA based on polyclonal antibodies and ELISA...
January 5, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28051175/continuous-fabrication-of-nanostructure-arrays-for-flexible-surface-enhanced-raman-scattering-substrate
#17
Chengpeng Zhang, Peiyun Yi, Linfa Peng, Xinmin Lai, Jie Chen, Meizhen Huang, Jun Ni
Surface-enhanced Raman spectroscopy (SERS) has been a powerful tool for applications including single molecule detection, analytical chemistry, electrochemistry, medical diagnostics and bio-sensing. Especially, flexible SERS substrates are highly desirable for daily-life applications, such as real-time and in situ Raman detection of chemical and biological targets, which can be used onto irregular surfaces. However, it is still a major challenge to fabricate the flexible SERS substrate on large-area substrates using a facile and cost-effective technique...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28042940/improved-performance-of-dna-microarray-multiplex-hybridization-using-probes-anchored-at-several-points-by-thiol-ene-or-thiol-yne-click-chemistry
#18
Maria-Jose Bañuls, Pilar Jiménez-Meneses, Albert Meyer, Jean-Jacques Vasseur, François Morvan, Jorge Escorihuela, Rosa Puchades, Angel Maquieira
Nucleic acid microarray-based assay technology has recognized lacks in reproducibility, reliability and analytical sensitivity. Here, a new strategy of probe attachment modes for silicon-based materials is built up. Thus, hybridization ability is enhanced combining thiol-ene or thiol-yne click chemistry reactions, with a multi-point attachment of polythiolated probes. The viability and performance of this approach were demonstrated determining specifically Salmonella PCR products up to 20 pM sensitivity level...
January 2, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28025028/ifcc-approved-hplc-reference-measurement-procedure-for-the-alcohol-consumption-biomarker-carbohydrate-deficient-transferrin-cdt-its-validation-and-use
#19
François Schellenberg, Jos Wielders, Raymond Anton, Vincenza Bianchi, Jean Deenmamode, Cas Weykamp, John Whitfield, Jan-Olof Jeppsson, Anders Helander
Carbohydrate-deficient transferrin (CDT) is used as a biomarker of sustained high alcohol consumption. The currently available measurement procedures for CDT are based on various analytical techniques (HPLC, capillary electrophoresis, nephelometry), some differing in the definition of the analyte and using different reference intervals and cut-off values. The Working Group on Standardization of CDT (WG-CDT), initiated by the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC), has validated an HPLC candidate reference measurement procedure (cRMP) for CDT (% disialotransferrin to total transferrin based on peak areas), demonstrating that it is suitable as a reference measurement procedure (RMP) for CDT...
December 23, 2016: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/28012654/the-role-of-calcium-concentration-in-the-invasive-capacity-of-corbicula-fluminea-in-crystalline-basins
#20
Noé Ferreira-Rodríguez, Ignacio Fernández, Simone Varandas, Rui Cortes, M Leonor Cancela, Isabel Pardo
The natural variation of environmental factors in freshwater basins determines their biodiversity. Among them, calcium is a key physiological compound for freshwater invertebrates. It is required for shell formation, muscle contraction, it mediates gene expression and allows counteracting acidosis during stress periods, among other functions. Although the distribution of different freshwater species has been suggested to be linked with the environmental calcium concentration, as yet, no research studies have confirmed this...
December 21, 2016: Science of the Total Environment
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