Search Results - "Hellinghausen, Garrett"

Improving peak capacities over 100 in less than 60 seconds: operating above normal peak capacity limits with signal processing by Hellinghausen, Garrett, Wahab, M. Farooq, Armstrong, Daniel W.

“…A primary focus in liquid chromatography analysis of complex samples is high peak capacity separations. Using advanced instrumentation and optimal small,…”
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Power Law Approach as a Convenient Protocol for Improving Peak Shapes and Recovering Areas from Partially Resolved Peaks by Wahab, M. Farooq, Gritti, Fabrice, O’Haver, Thomas C., Hellinghausen, Garrett, Armstrong, Daniel W.

“…Separation techniques have developed rapidly where sub-second chromatography, ultrahigh resolution recycling chromatography, and two-dimensional liquid…”
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Triple Helical Ir(ppy)3 Phenylene Cage Prepared by Diol‐Mediated Benzannulation: Synthesis, Resolution, Absolute Stereochemistry and Photophysical Properties by Sato, Hiroki, Blemker, Michelle A., Hellinghausen, Garrett, Armstrong, Daniel W., Nafie, Jordan W., Roberts, Sean T., Krische, Michael J.

“…Cyclometalation of a triple helical N‐doped phenylene cage prepared by ruthenium(0)‐catalyzed diol–diene benzannulation delivers a chiral, conformationally…”
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Mass Spectrometry-Compatible Enantiomeric Separations of 100 Pesticides Using Core–Shell Chiral Stationary Phases and Evaluation of Iterative Curve Fitting Models for Overlapping Peaks by Hellinghausen, Garrett, Readel, Elizabeth R., Wahab, M. Farooq, Lee, J. T., Lopez, Diego A., Weatherly, Choyce A., Armstrong, Daniel W.

“…Pesticides are often chiral, and their isomers have different activity, toxicity, metabolism, and degradation properties. Perhaps, the most complex are the…”
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Evaluation of the Edman degradation product of vancomycin bonded to core‐shell particles as a new HPLC chiral stationary phase by Hellinghausen, Garrett, Lopez, Diego A., Lee, Jauh T., Wang, Yadi, Weatherly, Choyce A., Portillo, Abiud E., Berthod, Alain, Armstrong, Daniel W.

“…A modified macrocyclic glycopeptide‐based chiral stationary phase (CSP), prepared via Edman degradation of vancomycin, was evaluated as a chiral selector for…”
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Cyclofructans as Chiral Selectors: An Overview by Hellinghausen, Garrett, Armstrong, Daniel W

“…Cyclofructans are cyclic oligosaccharides made of β-2,1-linked fructofuranose units. They have been utilized as chiral selectors, usually after derivatization,…”
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Increasing chromatographic resolution of analytical signals using derivative enhancement approach by Wahab, M. Farooq, O’Haver, Thomas C., Gritti, Fabrice, Hellinghausen, Garrett, Armstrong, Daniel W.

“…A few decades ago, Giddings made a bleak statistical prediction stating that when using a chromatographic column with a peak capacity of n, one “has no real…”
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Improving visualization of trace components for quantification using a power law based integration approach by Hellinghausen, Garrett, Farooq Wahab, M., Armstrong, Daniel W.

“…•Trace components are often partially overlapping with other major components.•Power laws are employed to decrease noise and recover areas.•First and second…”
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A comprehensive methodology for the chiral separation of 40 tobacco alkaloids and their carcinogenic E/Z-(R,S)-tobacco-specific nitrosamine metabolites by Hellinghausen, Garrett, Roy, Daipayan, Wang, Yadi, Lee, Jauh T., Lopez, Diego A., Weatherly, Choyce A., Armstrong, Daniel W.

“…The predominant enantiomer of nicotine found in nature is (S)-nicotine and its pharmacology has been widely established. However, pharmacologic information…”
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Effective methodologies for enantiomeric separations of 150 pharmacology and toxicology related 1°, 2°, and 3° amines with core-shell chiral stationary phases by Hellinghausen, Garrett, Roy, Daipayan, Lee, Jauh T., Wang, Yadi, Weatherly, Choyce A., Lopez, Diego A., Nguyen, Kate A., Armstrong, John D., Armstrong, Daniel W.

“…[Display omitted] •Rapid method development for optimized enantiomeric separations of 150 amines.•Biological compatible MS analysis of 150…”
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Development, Evaluation, and Application of Chromatographic Resolution Enhancement Strategies by Hellinghausen, Garrett

“…With the emergence of advanced separation technologies, like high-efficiency stationary phases bonded with superficially porous particles, or sub-2 μm fully…”
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Evaluation of nicotine in tobacco‐free‐nicotine commercial products by Hellinghausen, Garrett, Lee, Jauh T., Weatherly, Choyce A., Lopez, Diego A., Armstrong, Daniel W.

“…Recently, a variety of new tobacco‐free‐nicotine, TFN, products have been commercialized as e‐liquids. Tobacco‐derived nicotine contains predominantly…”
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