a mathematical model of sorption of zirconium and hafnium cations mixture and elution of these ions from a cation exchange resin bed is developed. sulfuric acid is selected as the eluent for selective separation of zr and hf in a packed bed of dowex cation exchange resin. the column model is a dispersed plug flow model,and assumed to consist of randomly packed synthetic and spherical resin bead...

K E Y W O R D S Lipids, lipidome, metabolomics, lipidomics, ion mobility spectrometry, Hydrophilic interaction chromatography (HILIC), HDMS Compare, T-WaveTM Technology A P P L I C AT IO N B E N E F I T S Combining HILIC-UPLC liquid phase separation with gas phase ion mobility mass spectrometry to achieve a multi-dimensional characterization of lipids in complex mixtures enhances profiling of l...

Besides the production process, the product recovery must be also taken into consideration – not only because of its usually high contribution to the total process costs but also on account of the necessity of integrating it on-line into the production process if the product is inhibitory. In the case of pyruvate, some indications have been published that high extra-cellular pyruvate concentrat...

The use of CO(2) as a massive and polarizable drift gas is shown to greatly improve peak-to-peak resolution (R(p-p) ), as compared with N(2) , for the separation of disaccharides in a Synapt G2 traveling wave ion mobility cell. Near or baseline R(p-p) was achieved for three pairs of sodiated molecules of disaccharide isomers, that is, cellobiose and sucrose (R(p-p)  = 0.76), maltose and sucrose...

A method for the determination of arsenic species (arsenide, arsenate) in traditional Chinese medicines using hydride generation atomic fluorescence spectrometry (HG-AFS) with ion exchange resin separation has been studied. The ion exchange resin was used to separate the arsenide and arsenate, and the separation conditions were investigated. The experimental conditions that influence the fluore...

A novel counter-ion, N-methylimipramine, was synthesized and utilized in the separation of inositol phosphates by ion-pair chromatography. The structural identity of the counter-ion was documented by nuclear magnetic resonance spectroscopy. This counter-ion was capable of resolving inositol phosphates isocratically by reversed-phase high-performance liquid chromatography. Solvent polarity and i...

In voltage clamp experiments, ionic flow is measured as electrical current. Macroscopic currents recorded from whole cells, or from relatively large areas of cell membrane, represent the sum of the ion fluxes through many channels, generally of more than one type. The first step in the interpretation of such currents is usually their separation into constituent components, each associated with ...

a) Run the program HPCESIM. Copy all basic parameters (Equipment, Capillary, Buffer, Sample, Inject and Detect) for electrophoretic separation of mixture of 4 organic acids into table 1. Table 1 Voltage U (kV) Current I (μA) Thermostating temperature T (oC) Capillary length to detector L (mm) ID (inner diameter of capillary) (μm) Separation mode (anionic/cationic) Composition of basic electroly...