Packed column supercritical fluid chromatography–mobile phase elimination Fourier transform infrared spectrometry employing modified fluids

Smith, Stephen; Jordan, Sheri L.; Taylor, Larry T.; Dwyer, James L.; Willis, J

doi:10.1016/s0021-9673(96)00908-9

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…We needed to separate them to each component by any method in order to prepare the single crystals and to obtain the detailed information on the crystal structure through the X-ray analysis. As for the separation of a mixture into components, the various types of methods have been reported, among which a supercritical fluid chromatography (SFC) is now becoming a quite useful method. − In many cases carbon dioxide is used as a development fluid for chromatography. When the temperature and pressure of carbon dioxide gas are increased above the critical temperature (31.3 °C) and critical pressure (72.9 atm), the gas changes into the so-called supercritical fluid state.…”

Section: Introductionmentioning

confidence: 99%

Confirmation of Crystal Structure of Poly(vinylidene fluoride) through the Detailed Structure Analysis of Vinylidene Fluoride Oligomers Separated by Supercritical Fluid Chromatography

Tashiro

Hanesaka

2001

Macromolecules

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Vinylidene fluoride (VDF) oligomers with uniform molecular weights were separated successfully by using supercritical fluid chromatography, and the crystal structures were determined by X-ray analysis of the single crystals. Although the chemical formulas of these oligomer components had not been known clearly, the X-ray structure analysis gave us the following results: CF(CF 3)2-(CH2-CF2)n-I with n ) 6-12. The oligomer chains were found to form a layer structure, in which the chains are tilted slightly from the normal to the layer plane. The chain conformation of the oligomers, when crystallized from ethanol solutions, was a repetition of TGTG h , essentially the same with that of poly-(vinylidene fluoride) crystal form II. The packing structure of central VDF sequence parts was also found to be the same with that of form II: the chains are packed in an antiparallel mode with respect to the chain direction as well as the direction of CF 2 dipoles. A series of oligomers were found to show a variety of crystal modifications depending on the sample preparation conditions, as seen from the infrared spectral patterns.

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Section: Introductionmentioning

confidence: 99%

Confirmation of Crystal Structure of Poly(vinylidene fluoride) through the Detailed Structure Analysis of Vinylidene Fluoride Oligomers Separated by Supercritical Fluid Chromatography

Tashiro

Hanesaka

2001

Macromolecules

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“…Smith et al separated, detected, and identified Irganox 1076 by SFC-IR using a solvent elimination interface originally designed for LC/IR (104). They reported obtaining high-quality spectra from 700 to 4000 cm -1 with no interference from the methanol modifier.…”

Section: Supercritical Fluid Chromatographymentioning

confidence: 99%

Supercritical Fluid Chromatography and Extraction

1998

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“…IR characteristic peaks of target contaminants are masked in a mobile phase with strong infrared adsorption. Although some methods were reported to solve this difficult problem in the 1990s, such as flow extraction 23 24 , chemical reaction 25 , metal wire 26 , and continuous spray 27 , each of these methods had some defects needing further modification. For example, the disadvantage of flow extraction and chemical reaction is not to eliminate the interference of water and organic solvents in the IR measurement of the target contaminants; the defects of metal wire is only to collect a part of sample amount; the shortcoming of continuous spray is to the lower signal-to-noise ratio.…”

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confidence: 99%

Separation and determination of estrogen in the water environment by high performance liquid chromatography-fourier transform infrared spectroscopy

Zheng

et al. 2016

Sci Rep

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The components for connecting high-performance liquid chromatography (HPLC) with Fourier-transform infrared spectroscopy (FTIR) were investigated to determine estrogen in the water environment, including heating for atomization, solvent removal, sample deposition, drive control, spectrum collection, chip swap, cleaning and drying. Results showed that when the atomization temperature was increased to 388 K, the interference of mobile phase components (methanol, H2O, acetonitrile, and NaH2PO4) were completely removed in the IR measurement of estrogen, with 0.999 of similarity between IR spectra obtained after separation and corresponding to the standard IR spectra. In experiments with varying HPLC injection volumes, high similarity for IR spectra was obtained at 20 ul injection volume at 0.01 mg/L BPA while a useful IR spectrum for 10 ng/L BPA was obtained at 80 ul injection volume. In addition, estrogen concentrations in the natural water samples were calculated semi-quantitatively from the peak intensities of IR spectrum in the mid-infrared region.

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Packed column supercritical fluid chromatography–mobile phase elimination Fourier transform infrared spectrometry employing modified fluids

Cited by 12 publications

References 7 publications

Confirmation of Crystal Structure of Poly(vinylidene fluoride) through the Detailed Structure Analysis of Vinylidene Fluoride Oligomers Separated by Supercritical Fluid Chromatography

Confirmation of Crystal Structure of Poly(vinylidene fluoride) through the Detailed Structure Analysis of Vinylidene Fluoride Oligomers Separated by Supercritical Fluid Chromatography

Supercritical Fluid Chromatography and Extraction

Separation and determination of estrogen in the water environment by high performance liquid chromatography-fourier transform infrared spectroscopy

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