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Analytical chemistry

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  1. Competitive Host-Guest Interaction between β-Cyclodextrin Polymer and Pyrene-Labeled Probes for Fluorescence Analyses.

    Analytical chemistry 87(5):2665 (2015) PMID 25622804

    We developed a novel homogeneous fluorescence analysis based on a novel competitive host-guest interaction (CHGI) mechanism between β-cyclodextrin polymer (polyβ CD) and pyrene-labeled probe for biochemical assay. Pyrene labeling with oligonucleotide strands can be recruited and reside in lipophilic...
  2. Chemical imaging of latent fingerprints by mass spectrometry based on laser activated electron tunneling.

    Analytical chemistry 87(5):2693 (2015) PMID 25647159

    Identification of endogenous and exogenous chemicals contained in latent fingerprints is important for forensic science in order to acquire evidence of criminal identities and contacts with specific chemicals. Mass spectrometry has emerged as a powerful technique for such applications without any de...
  3. Pyridine-biquinoline-metal complexes for sensing pyrophosphate and hydrogen sulfide in aqueous buffer and in cells.

    Analytical chemistry 87(5):2678 (2015) PMID 25673091

    We report a new pyridine-biquinoline-derivative fluorophore L for effectively sensing pyrophosphate (PPi) and monohydrogen sulfide (HS(-)) in aqueous buffer and in living cells. L could selectively coordinate with metal ions (M(n+)) in Groups IB and IIB to form L-M(n+) complexes with 1:1 stoichiomet...
  4. Nonfaradaic nanoporous electrochemistry for conductometry at high electrolyte concentration.

    Analytical chemistry 87(4):2443 (2015) PMID 25590534

    We report the contributions of ion concentration and applied ac frequency to the electrode impedance through an electrical double layer overlap and ion transport along the nanopores. Nanoporous Pt with uniform pore size and geometry (L2-ePt) responded more sensitively to conductivity changes in aque...
  5. Probing Combustion Chemistry in a Miniature Shock Tube with Synchrotron VUV Photo Ionization Mass Spectrometry.

    Analytical chemistry 87(4):2345 (2015) PMID 25594229

    We present results of a PI-TOF-MS study at the Advanced Light Source at Lawrence Berkeley National Laboratory. Dimethyl ether pyrolysis (2% CH3OCH3/Ar) was observed behind the reflected shock (1400 < T5 < 1700 K, 3 < P5 < 16 bar) with ionization energies between 10 and 13 eV. Individual experiments...
  6. Controlled rotation and vibration of patterned cell clusters using dielectrophoresis.

    Analytical chemistry 87(4):2389 (2015) PMID 25611070

    We demonstrate a new strategy for the mechanical stimulation of large cell clusters, taking advantage of dielectrophoresis. This strategy is based on the cellular spin resonance mechanism, but it utilizes coating agents, such as bovine serum albumin, to create consistent rotation and vibration of in...
  7. Accumulation and separation of membrane-bound proteins using hydrodynamic forces.

    Analytical chemistry 83(2):604 (2011) PMID 21155531

    We demonstrate how hydrodynamic forces can be used to both accumulate and separate membrane-bound proteins in their native state. A supported lipid bilayer (SLB) was formed inside a microfluidic channel with the two proteins streptavidin (SA) and cholera toxin (CT) coupled to receptors in the lipid...
  8. Ion-selective optode nanospheres as heterogeneous indicator reagents in complexometric titrations.

    Analytical chemistry 87(5):2827 (2015) PMID 25622089

    We present here alternative, heterogeneous ionophore-based ion-selective nanospheres as indicators and chelators for optical titrations. The indicating nanospheres rely on a weaker extraction of the analyte of interest by ion-exchange, owing to the additional incorporation of a lipophilic pH indicat...
  9. Development and Validation of an Universal Interface for Compound-Specific Stable Isotope Analysis of Chlorine ((37)Cl/(35)Cl) by GC-High-Te...

    Analytical chemistry 87(5):2832 (2015) PMID 25647449

    A universal application of compound-specific isotope analysis of chlorine was thus far limited by the availability of suitable analysis techniques. In this study, gas chromatography in combination with a high-temperature conversion interface (GC-HTC), converting organic chlorine in the presence of H...
  10. Improved data-dependent acquisition for untargeted metabolomics using gas-phase fractionation with staggered mass range.

    Analytical chemistry 87(5):2861 (2015) PMID 25654645

    We report an improved DDA method for untargeted metabolomics using gas-phase fractionation with staggered mass range (sGPF). Unlike the single m/z segment for conventional GPF, the m/z segments for sGPF were narrower, multiplex, and discrete to allow more homogeneous selection of precursor ions in l...