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Synthesis and evaluation of porous polymethylsilsesquioxane microspheres as low silanol activity chromatographic stationary phase for basic compound separation
10.1016/j.chroma.2018.04.024 2018-04-11 Polymethylsilsesquioxanes (PMSQ) are potentially useful materials for liquid chromatography owing to their unique chemical, electrical and mechanical properties. Surprisingly however, no systematic studies on the use of spherical PMSQ particles as chromatogra... |
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PH-Zone-Refining Counter-Current Chromatography with A Hydrophilic Organic/Salt-Containing Two-Phase Solvent System for Preparative Separation of Polar Alkaloids from Natural Products
10.1016/j.chroma.2018.04.007 2018-04-10 This study presents an efficient strategy based on pH-zone-refining counter-current chromatography with a hydrophilic organic/salt-containing two-phase system composed of acetonitrile, sodium chloride and water for preparative separation of polar alkaloids fr... |
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Hydrophilicity nano-titania coating modified magnetic graphene oxide for pass-through cleanup of fipronil and its metabolites in human blood
10.1016/j.chroma.2018.04.019 2018-04-09 A novel hydrophilicity nano-titania coating modified magnetic graphene oxide (HTC-Mag-GO) has been synthesized. It has been evaluated in PRiME (process, robustness, improvements, matrix effects, ease of use) pass-through cleanup procedure for human blood prio... |
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Free silanols and ionic liquids as their suppressors in liquid chromatography
10.1016/j.chroma.2018.04.002 2018-04-07 In this review, we will firstly discuss the types and the general properties of silica, focusing on the silica support used in chromatography and capillary electrophoresis. Additionally, the characterization of functional groups (silanols and siloxnes) will b... |
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One-pot polymerization of monolith coated stir bar for high efficient sorptive extraction of perfluoroalkyl acids from environmental water samples followed by high performance liquid chromatography-electrospray tandem mass spectrometry detection
10.1016/j.chroma.2018.04.014 2018-04-06 In this work, poly(1-vinylimidazole-ethyleneglycol dimethacrylate) (poly(VI-EDMA)) monolith coated stir bars were synthesized by one-pot polymerization, and they exhibited higher extraction efficiency and faster extraction dynamics for selected PFAAs than com... |
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Simultaneous determination of nine bisphenols in sewage and sludge using dummy molecularly imprinted solid-phase extraction coupled with liquid chromatography tandem mass spectrometry
10.1016/j.chroma.2018.04.004 2018-04-03 This paper describes the simultaneous determination of bisphenol A (BPA), bisphenol S (BPS), bisphenol F (BPF), bisphenol E (BPE), bisphenol B (BPB), bisphenol AF (BPAF), bisphenol AP (BPAP), bisphenol Z (BPZ) and tetrabromobisphenol A (TBBPA) in sewage and s... |
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Numerical investigation of band spreading generated by flow-through needle and fixed loop sample injectors
10.1016/j.chroma.2018.04.001 2018-04-03 The present study reports on a computational fluid dynamics study of the band broadening occurring in injector systems frequently used in contemporary liquid chromatography instruments. The aim of this work is to determine band broadening originating purely f... |
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Pore Size Effect of Mesoporous Silica Stationary Phase on the Separation Performance of Microfabricated Gas Chromatography Columns
10.1016/j.chroma.2018.04.006 2018-04-03 Microfabricated semi-packed gas chromatography (GC) columns coated with two kinds of mesoporous silica (MS) stationary phase have been explored and compared in this paper. The micro GC (μGC) columns are fabricated by microelectromechanical system (MEMS) techn... |
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Ion exchange column capacities. Predicting retention behavior of open tubular columns coated with the same phase
10.1016/j.chroma.2018.03.056 2018-03-31 We discuss the reported capacities of available packed column ion exchange columns and the different methods used for their measurement. We outline basic considerations related to both packed and open tubular columns based on ion exchange latex particles. The... |
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High performance liquid chromatography column efficiency enhancement by zero dead volume recycling and practical approach using park and recycle arrangement
10.1016/j.chroma.2018.03.058 2018-03-31 A new instrumental approach to recycling HPLC is described. The concept is based on fast reintroduction of incremental peak sections back onto the separation column. The re-circulation is performed within a closed loop containing only the column and two synch... |