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Showing 1 to 20 of 3202 for “"Chromatography"”.
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Multifunctional chromatography supports
… this study was to create a bi-layered packed bed chromatography support for the purification of nano-sized bioproducts. The effect of three different chemistry approaches, different solvent conditions, and microwave heating were investigated on construction of a bi-layered support. Sepharose CL-6B …
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Brown Girl Chromatography
This poetry manuscript is based on the experiences of a Bangladeshi-born American female. The narrator of these poems navigates the conflict between her two cultural identities while growing up as a first generation immigrant in the United States. This creative work interrogates issues of race, …
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Investigation of mass spectrometric interfaces for supercritical fluid chromatography and liquid chromatography
… interface (PB) coupled to supercritical fluid chromatography (SFC) and mass spectrometry (MS) were assessed with pure and methanol-modified CO₂. Factors which affect the nebulization and the subsequent desolvation of the droplets were assessed. The quantitative performance was evaluated …
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Chip-Scale Gas Chromatography
… are thus less prone to cross-contamination. Gas chromatography (GC) is the leading analytical instrument for the analysis of volatile organic compounds (VOCs). Due to its wide-ranging applications, it has received great attention both from industrial sectors and scientific communities. Recently, …
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Capillary supercritical fluid chromatography
The modification of a gas chromatograph for capillary supercritical fluid was demonstrated. The resulting instrument was used to characterize the performance of capillary columns manufactured specifically for SFC applications. The columns were tested for inertness, efficiency, and immobilization …
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Advances in DNA Affinity Chromatography
<p>Different aspects of DNA affinity chromatography such as DNA complexity heparin elution, the Bi-column method and the oligonucluotide trapping method were studied. The complexity (length) of a DNA sequence attached to an affinity chromatography column affects column retention, and the purity of …
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Supercritical fluid chromatography - mass spectrometry
High performance liquid chromatography (HPLC) is the most widely used<br/>separation technique within the pharmaceutical industry. Due to the growing need for<br/>high speed and high quality separations other techniques, such as supercritical fluid<br/>chromatography (SFC), are now being …
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Quantitative detection in gas chromatography
… encountered in quantitative analysis by gas chromatography are discussed, with particular reference to detection systems. The properties of an ideal detector for quantitative analysis are listed. A description is given of the mode of operation of detectors for gas chromatography, and the …
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Methods Development in Chiral Chromatography
Chiral stationary phases derived from N-3,5-dinitrobenzoyl amino acids, amides of 1-aryl-1-alkylamines and N-2-naphthyl amino acids have proven to be viable sorbents for the direct liquid chromatographic separation of enantiomers. In an effort to extend the utility of these chrial stationary …
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Microbore columns in liquid chromatography
… for their application to High Performance Liquid Chromatography. Microbore columns consist of stainless steel tubing, 1/16¹¹ OD x 1mm ID, packed with silica gel or other suitable material. These columns were evaluated in terms of extra-column variance effects, mass sensitivity, and solvent …
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Preparative high performance liquid chromatography
A balanced density slurry-packing apparatus was developed and used to pack sixteen HPLC columns having different lengths and internal diameters with 10 µm Lichrosorb Sl-100. The evaluation of these columns led to several conclusions: the column efficiency, expressed in plates per meter, is a …
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Studies in ion exchange chromatography
… to the field of quantitative analysis. Since ion chromatography is primarily a quantitative technique, the linear range of the detector is of particular interest. The linear range was determined to be nearly five orders of magnitude for several common ions. The probes used were fluoride, chloride, …
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Adiabatic Packed Column Supercritical Fluid Chromatography
A well-known problem in supercritical fluid chromatography is the drastic decrease in chromatographic performance at temperatures above 40 C and outlet pressures below 120 bar. This phenomenon has been attributed to isenthalpic expansion and cooling of the mobile phase and poor heat transport under …
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Thermodynamic Measurements by Gas-Liquid Chromatography
The aim of the first part of this work was to provide solubility data for the large scale continuous and semi-continuous gas liquid chromatographs (G.L.C.) in operation in this department by using analytical G.L.C. equipment. A commercial dual-channel chromatograph was modified to enable the …
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"Vector chromatography" : modeling micropatterned separation devices
… through the chromatographic column. Vector chromatography is quantified by two global "macrotransport coefficients," namely the solute mobility dyadic M* (representing the tensor proportionality coefficient between the mean solute velocity vector U* and the external force vector F acting …
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A network model for perfusion chromatography
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1995.
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Packed capillary columns for liquid chromatography
… capillary columns for high performance liquid chromatography are examined. Historically, the advantages are smaller sample and phase consumption, enhancement in sensitivity, easy column synthesis, higher obtainable efficiency, and easier interfacing to other techniques. These points are …
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Supercritical Fluid Chromatography of Ionic Compounds
… analytes via packed column supercritical fluid chromatography (SFC). Firstly, we focused on the elution of sodium arylsulfonate analytes by using various ionic additives, such as lithium acetate, ammonium acetate, tetramethylammonium acetate, tetrabutylammonium acetate, and ammonium chloride. …
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Semi-Packed Micro Gas Chromatography Columns
Separation of complex gaseous mixtures using gas chromatography (GC) is an important step in analytical systems for environmental monitoring, medical diagnosis, and forensic science. Due to its high resolving power, analysis speed, and small sample size, GC, has become the premier technique for …
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