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Analytical chemistry

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  1. Mass-selective soft-landing of protein assemblies with controlled landing energies.

    Analytical chemistry 86(16):8321 (2014) PMID 25026391

    We have developed a tandem mass spectrometer with the capability for controlled ion soft-landing and ex situ visualization of the soft-landed particles by means of transmission electron microscopy. The deposition conditions can be controlled by adjusting the kinetic energies of the ions by applying...
  2. Dual Electrochemical and Physiological Apoptosis Assay Detection of in Vivo Generated Nickel Chloride Induced DNA Damage in Caenorhabditis e...

    Analytical chemistry 86(16):8418 (2014) PMID 25048399

    Environmental nickel exposure is known to cause allergic reactions, respiratory illness, and may be responsible for some forms of cancer in humans. Nematodes are an excellent model organism to test for environmental toxins, as they are prevalent in many different environments. Nickel exposure has pr...
  3. Expansion of the Ion Library for Mining SWATH-MS Data through Fractionation Proteomics.

    Analytical chemistry 86(15):7242 (2014) PMID 24969961

    We propose an approach to construct an expanded ion library using the data-dependent acquisition (DDA) data generated by fractionation proteomics. We identified three critical elements for achieving a satisfactory ion library during the iterative process of our ion library expansion, including a cor...
  4. Subnanomolar detection limit of stripping voltammetric ca(2+)-selective electrode: effects of analyte charge and sample contamination.

    Analytical chemistry 86(15):7939 (2014) PMID 24992261

    We report on stripping voltammetry of down to 0.1 nM Ca(2+) by using a thin-polymer-coated electrode and demonstrate the advantageous effects of the divalent charge on sensitivity. A simple theory predicts that the maximum concentration of an analyte ion preconcentrated in the thin membrane depends...
  5. Microfluidic paper-based analytical device for the determination of nitrite and nitrate.

    Analytical chemistry 86(15):7274 (2014) PMID 25001619

    A low-cost disposable colorimetric microfluidic paper-based analytical device (μPAD) was developed for the determination of nitrite and nitrate. Nitrite is determined directly by the Griess reaction while nitrate is first reduced to nitrite in a hydrophilic channel of the μPAD with immobilized zinc...
  6. Simultaneous Mass Quantification of Nanoparticles of Different Composition in a Mixture by Microdroplet Generator-ICPTOFMS.

    Analytical chemistry 86(16):8142 (2014) PMID 25014784

    This work investigated the potential of a high temporal resolution inductively coupled plasma time-of-flight mass spectrometer (ICPTOFMS) in combination with a microdroplet generator (MDG) for simultaneous mass quantification of different nanoparticles (NPs) in a mixture. For this purpose, a test sy...
  7. Inappropriate use of the quasi-reversible electrode kinetic model in simulation-experiment comparisons of voltammetric processes that approa...

    Analytical chemistry 86(16):8408 (2014) PMID 25047798

    Many electrode processes that approach the "reversible" (infinitely fast) limit under voltammetric conditions have been inappropriately analyzed by comparison of experimental data and theory derived from the "quasi-reversible" model. Simulations based on "reversible" and "quasi-reversible" models ha...
  8. Heterologous Antigen Selection of Camelid Heavy Chain Single Domain Antibodies against Tetrabromobisphenol A.

    Analytical chemistry 86(16):8296 (2014) PMID 25068372 PMCID PMC4139172

    We conclude the many advantages of VHH make them attractive for the development of immunoassays to small molecules....
  9. Exploring metabolic pathways in vivo by a combined approach of mixed stable isotope-labeled Raman microspectroscopy and multivariate curve r...

    Analytical chemistry 86(15):7828 (2014) PMID 24975289

    We report that metabolic pathways can be explored in vivo by mixed stable isotope-labeled Raman microspectroscopy in conjunction with multivariate curve resolution analysis. As a model system, we studied ergosterol biosynthesis in single living fission yeast cells grown in mixtures of normal and (13...
  10. Picking vanished proteins from the void: how to collect and ship/share extremely dilute proteins in a reproducible and highly efficient mann...

    Analytical chemistry 86(15):7421 (2014) PMID 24987932

    We suggest an optimized universal protocol ensuring reproducibility and effective enrichment of dilute samples by commercial affinity beads. By comparably assessing the performance of the new protocol with selected standard enrichment techniques, we show the seamless application of the enrichment in...