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Analytical chemistry

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  1. Single-cell Western blotting after whole-cell imaging to assess cancer chemotherapeutic response.

    Analytical chemistry 86(20):10429 (2014) PMID 25226230

    We optimize and apply a new targeted proteomics modality, single-cell western blotting (scWestern), to a human glioblastoma cell line. To acquire both phenotypic and proteomic data on the same, single glioblastoma cells, we integrate high-content imaging prior to the scWestern assays. The scWestern...
  2. Multiwavelength fluorescence otoscope for video-rate chemical imaging of middle ear pathology.

    Analytical chemistry 86(20):10454 (2014) PMID 25226556

    We propose a novel multiwavelength fluorescence-based video-rate imaging strategy that combines readily available optical elements and software components to create a novel otoscopic device. This modified otoscope enables low-cost, detailed and objective diagnosis of common middle ear pathological c...
  3. Creation of libraries of recurring mass spectra from large data sets assisted by a dual-column workflow.

    Analytical chemistry 86(20):10231 (2014) PMID 25233296

    An analytical methodology has been developed for extracting recurrent unidentified spectra (RUS) from large GC/MS data sets. Spectra were first extracted from original data files by the Automated Mass Spectral Deconvolution and Identification System (AMDIS; Stein, S. E. J. Am. Soc. Mass Spectrom. 19...
  4. 1,5-diaminonaphthalene hydrochloride assisted laser desorption/ionization mass spectrometry imaging of small molecules in tissues following ...

    Analytical chemistry 86(20):10114 (2014) PMID 25247713

    Our results suggested that the newly prepared matrix possessed brilliant features including low cost, strong ultraviolet absorption, high salt tolerance capacity, and fewer background signals especially in the low mass range (typically m/z < 500), which permitted us to visualize the spatial distribu...
  5. Recombinant streptavidin nanopeptamer anti-immunocomplex assay for noncompetitive detection of small analytes.

    Analytical chemistry 86(20):10467 (2014) PMID 25257512

    We generated recombinant chimeras by fusing anti-immunocomplex peptides selected from phage libraries to the N- or C-termini of core streptavidin and used them to setup phage-free noncompetitive assays for the herbicide clomazone (MW 240 Da). The best conditions for refolding were optimized by a hig...
  6. Ratiometric Two-Photon Fluorescent Probe for Quantitative Detection of β-Galactosidase Activity in Senescent Cells.

    Analytical chemistry 86(20):10001 (2014) PMID 25293957

    We reported a ratiometric two-photon fluorescent probe (SG1) for β-galactosidase (β-gal) and its application to quantitative detection of β-gal activity during cellular senescence in live cells and in aged tissues. This probe is characterized by a significant two-photon excited fluorescence, a marke...
  7. Ratiometric fluorescent probe based on gold nanoclusters and alizarin red-boronic Acid for monitoring glucose in brain microdialysate.

    Analytical chemistry 86(19):9758 (2014) PMID 25157796

    Glucose monitoring with high sensitivity and accuracy in the cerebrospinal fluid is a challenge for evaluating the role of glucose in the physiological and pathological processes. In this work, a ratiometric fluorescent probe for sensing glucose was developed. In the probe, the gold nanoclusters pro...
  8. Method of Atmospheric Pressure Charge Stripping for Electrospray Ionization Mass Spectrometry and Its Application for the Analysis of Large ...

    Analytical chemistry 86(19):9644 (2014) PMID 25188777

    We introduce a new atmospheric pressure charge stripping (AP-CS) method for the electrospray ionization mass spectrometry (ESI-MS) analysis of heterogeneous mixtures, utilizing ion/ion proton transfer reactions within an experimental ion source to remove excess charge from sample ions and thereby re...
  9. Semiautomated pH Gradient Ion-Exchange Chromatography of Monoclonal Antibody Charge Variants.

    Analytical chemistry 86(19):9794 (2014) PMID 25199803

    A new approach using a chromatography system equipped with isocratic pumps and an electrolytic eluent generator (EG) is introduced, replacing external pH gradient delivery using conventional gradient systems, in which bottled buffers with preadjusted pH are mixed using a gradient pump. The EG is cap...
  10. Quantifying biomass composition by gas chromatography/mass spectrometry.

    Analytical chemistry 86(19):9423 (2014) PMID 25208224

    We developed a set of methods for the quantification of four major components of microbial biomass using gas chromatography/mass spectrometry (GC/MS). Specifically, methods are described to quantify amino acids, RNA, fatty acids, and glycogen, which comprise an estimated 88% of the dry weight of Esc...