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Showing 1 to 20 of 52 for “"supercritical fluid extraction"”.
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Supercritical fluid extraction of non-traditional matrices
Supercritical extraction (SFE) has most often been linked to the use of modified or unmodified CO₂ for the recovery of relatively non-polar analytes from solid matrices. The objective of this research was to expand current supercritical fluid (SF) techniques to the recovery of analytes from …
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Liquid collection efficiencies after supercritical fluid extraction
The design of any supercritical fluid extraction (SFE) experiment should break down into two parts: 1) removal of the analytes of interest from the bulk matrix and 2) deposition of those analytes in a user friendly manner for further studies (spectroscopy or chromatography). While great attention …
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Investigation of Liquid Trapping Following Supercritical Fluid Extraction
Supercritical fluid extraction (SFE) is an alternative to traditional extractions with organic solvents. SFE consists of removing the analyte(s) from the matrix, solubilizing them, moving the analyte(s) into the bulk fluid, and sweeping the fluid containing the analyte(s) out of the extraction …
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Applications of modifiers in supercritical fluid extraction and chromatography
The use of modifiers in supercritical fluid chromatography and extraction has become quite common due to the inability of pure carbon dioxide alone to solvate many of the compounds of interest. The effects of modifiers in supercritical fluid chromatography have been more thoroughly studied than the …
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Supercritical Fluid Extraction of Nylon 6,6 Fiber Finish and Oligomers
… led to investigations of alternate methods of extraction. Several studies have shown that supercritical fluid extraction (SFE) using carbon dioxide as the extraction fluid is an important alternative to conventional organic solvent extraction for the removal of both textile finishes and …
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Efficiency of PAHs removal from clayey soil using supercritical fluid extraction
… and the remediation process. The difficulty in extraction of HOC (hydrophobic organic compounds) from clay material was reported. Therefore, the SFE (supercritical fluid extraction) has a potential to substitute classical methods. The efficiency of using SFE (ISCO 200 model) for clay soil …
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Supercritical Fluid Extraction and Chromatography of Various Lipids from Soybean Lecithin
… and phosphatidylserine have been studied by supercritical fluid chromatography (SFC) coupled with evaporative light scattering detection (ELSD) and mass spectrometry (MS). Four different silica-based stationary phases were studied: 2-ethylpyridine, 4-ethylpyridine, diol and conventional …
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Supercritical fluid extraction applied to environmental pollutants from Chesapeake Bay sediment
Sample preparation via supercritical fluid extraction (SFE) has been increasingly used to determine polynuclear aromatic hydrocarbons (P AHs) in environmental samples. As an alternative sample preparation technique, SFE offers the distinct advantages of greatly reduced sample preparation time, …
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The Fractionation of Crude Petroleum using Chromatography, Extrography and Supercritical Fluid Extraction
… of column chromatography, extrography and supercritical fluid extraction was compared.<br/> <br/>Column chromatography with a silica gel as stationary phase provided a means of fractionating a standard mixture of saturated and aromatic hydrocarbons and crude oils such that the aromatic …
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Forensic sample analysis using supercritical fluid extraction coupled with solid phase microextraction
… hair for target analytes. A new method combining supercritical fluid extraction and solid phase micro-extraction (SFE/SPME) is introduced. This coupled procedure utilises the advantages of using supercritical carbon dioxide as an extraction solvent and collecting the extract on a selected SPME …
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Supercritical fluid extraction of rice bran with adsorption on rice hull ash
… oil was extracted using environmentally-friendly supercritical carbon dioxide at varying conditions. Experimental treatments included pressure (27.6, 41.4 and 55.2 MPa), temperature (40 and 60 oC) and flow rates (25, 45 and 65 g/min) of supercritical carbon dioxide. Extracts collected at different …
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Supercritical fluid extraction : a study of binary and multicomponent solid-fluid equilibria
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1981.
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Fermentation product recovery by supercritical fluid extraction : microbiological and phase equilibrium aspects
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemical Engineering, 1988
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The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese
… derivatization of samples and difficulties in extraction and separation of short, medium and long chain fatty acids in a single analysis. Enhanced FFA recoveries from spiked matrix samples were obtained at 680 atm by SFE/SFC procedure with a 5% methanol modifier containing 1% acetic acid. A …
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Investigation of the supercritical fluid extraction and detection of metals in contaminated soils
In this work the Supercritical Fluid Extraction (SFE) and detection of sorbed metals in contaminated soils is explored. Iron containing samples were spiked onto sea sand and extracted with Supercritical Fluid CO₂. On-line detection was accomplished by decompressing the SF-CO₂ and analyte into a …
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Supercritical fluid extraction/chromatography and Fourier transform infrared spectrometry: methods optimization and applications
This work examines the use of supercritical fluid extraction (SFE)as a sample introduction technique for supercritical fluid chromatography (SFC) and Fourier transform infrared spectrometry (FT-IR). In order to study the effects of a supercritical mobile phase on the resulting IR spectra, carbon …
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Supercritical fluid extraction of polychlorinated biphenyls and organochlorine pesticides from mussel tissue (Mytilus edulis)
The supercritical fluid extraction (SFE) of twenty one polychlorinated biphenyls (PCBs) and eight organochlorine pesticides (OCPs) from freeze dried mussel tissue is discussed, demonstrated, and compared to traditional Soxhlet extractions. The aim of this study was to determine the efficacy of SFE …
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Study of single-screw extruders for continuous feeding of canola paste for supercritical fluid extraction
… to feed Canola seeds continuously into a supercritical fluid extractor was studied. The experiments were conducted with a custom-built extruder (0.44 m long, 36.75 mm ID barrel) fitted with a screw having a single flight 4.9 mm high and 3 mm wide. The clearance between the top of the …
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Wheat bran valorization by supercritical fluid extraction: characterization, formulation and application of wheat bran oil
La adición de antioxidantes es la estrategia más utilizada en la industria alimentaria para preservar la calidad de los alimentos, retardando su deterioro, rancidez o decoloración debida a la oxidación. Antioxidantes fenólicos sintéticos como el butilhidroxianisol (BHA), butilhidroxitolueno (BHT) y …
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