Chromatography, Supercritical Fluid: A CHROMATOGRAPHY method using supercritical fluid, usually carbon dioxide under very high pressure (around 73 atmospheres or 1070 psi at room temperature) as the mobile phase. Other solvents are sometimes added as modifiers. This is used both for analytical (SFC) and extraction (SFE) purposes.Chromatography, High Pressure Liquid: Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.Directories as Topic: Lists of persons or organizations, systematically arranged, usually in alphabetic or classed order, giving address, affiliations, etc., for individuals, and giving address, officers, functions, and similar data for organizations. (ALA Glossary of Library and Information Science, 1983)Ubiquinone: A lipid-soluble benzoquinone which is involved in ELECTRON TRANSPORT in mitochondrial preparations. The compound occurs in the majority of aerobic organisms, from bacteria to higher plants and animals.Plant Oils: Oils derived from plants or plant products.Antioxidants: Naturally occurring or synthetic substances that inhibit or retard the oxidation of a substance to which it is added. They counteract the harmful and damaging effects of oxidation in animal tissues.Coenzymes: Small molecules that are required for the catalytic function of ENZYMES. Many VITAMINS are coenzymes.Arecaceae: The palm family of order Arecales, subclass Arecidae, class Liliopsida.Materials Management, Hospital: The management of all procurement, distribution, and storage of equipment and supplies, as well as logistics management including laundry, processing of reusables, etc.Stereoisomerism: The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)Technology, Pharmaceutical: The application of scientific knowledge or technology to pharmacy and the pharmaceutical industry. It includes methods, techniques, and instrumentation in the manufacture, preparation, compounding, dispensing, packaging, and storing of drugs and other preparations used in diagnostic and determinative procedures, and in the treatment of patients.Pharmacopoeias as Topic: Authoritative treatises on drugs and preparations, their description, formulation, analytic composition, physical constants, main chemical properties used in identification, standards for strength, purity, and dosage, chemical tests for determining identity and purity, etc. They are usually published under governmental jurisdiction (e.g., USP, the United States Pharmacopoeia; BP, British Pharmacopoeia; P. Helv., the Swiss Pharmacopoeia). They differ from FORMULARIES in that they are far more complete: formularies tend to be mere listings of formulas and prescriptions.Drug Industry: That segment of commercial enterprise devoted to the design, development, and manufacture of chemical products for use in the diagnosis and treatment of disease, disability, or other dysfunction, or to improve function.Chromatography, Gas: Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix.Chemistry, Pharmaceutical: Chemistry dealing with the composition and preparation of agents having PHARMACOLOGIC ACTIONS or diagnostic use.Carbon Dioxide: A colorless, odorless gas that can be formed by the body and is necessary for the respiration cycle of plants and animals.Chromatography, Liquid: Chromatographic techniques in which the mobile phase is a liquid.Congresses as Topic: Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.Tandem Mass Spectrometry: A mass spectrometry technique using two (MS/MS) or more mass analyzers. With two in tandem, the precursor ions are mass-selected by a first mass analyzer, and focused into a collision region where they are then fragmented into product ions which are then characterized by a second mass analyzer. A variety of techniques are used to separate the compounds, ionize them, and introduce them to the first mass analyzer. For example, for in GC-MS/MS, GAS CHROMATOGRAPHY-MASS SPECTROMETRY is involved in separating relatively small compounds by GAS CHROMATOGRAPHY prior to injecting them into an ionization chamber for the mass selection.Capillary Electrochromatography: A separation technique which combines LIQUID CHROMATOGRAPHY and CAPILLARY ELECTROPHORESIS.

Field-based supercritical fluid extraction of hydrocarbons at industrially contaminated sites. (1/62)

Examination of organic pollutants in groundwaters should also consider the source of the pollution, which is often a solid matrix such as soil, landfill waste, or sediment. This premise should be viewed alongside the growing trend towards field-based characterisation of contaminated sites for reasons of speed and cost. Field-based methods for the extraction of organic compounds from solid samples are generally cumbersome, time consuming, or inefficient. This paper describes the development of a field-based supercritical fluid extraction (SFE) system for the recovery of organic contaminants (benzene, toluene, ethylbenzene, and xylene and polynuclear aromatic hydrocarbons) from soils. A simple, compact, and robust SFE system has been constructed and was found to offer the same extraction efficiency as a well-established laboratory SFE system. Extraction optimisation was statistically evaluated using a factorial analysis procedure. Under optimised conditions, the device yielded recovery efficiencies of >70% with RSD values of 4% against the standard EPA Soxhlet method, compared with a mean recovery efficiency of 48% for a commercially available field-extraction kit. The device will next be evaluated with real samples prior to field deployment.  (+info)

Simultaneous measurement of fluoroquinolones in eggs by a combination of supercritical fluid extraction and high pressure liquid chromatography. (2/62)

Simultaneous detection of the fluoroquinolone antibiotics ciprofloxacin, enrofloxacin, ofloxacin, and norfloxacin in eggs by a combination of supercritical fluid extraction (SFE) and high pressure liquid chromatography (HPLC) was studied. Lipid matrices that have been considered to result in poor extraction and isolation of fluoroquinolones in eggs were removed first by SFE with supercritical CO(2) alone, and then the fluoroquinolones were extracted by SFE with supercritical CO(2) containing 20% (v/v) methanol for HPLC analysis. A time-course study of the extraction of lipid matrices of eggs suggested that the SFE method successfully removed the matrices within 20 min. When the fluoroquinolones added to control eggs were extracted by SFE, the extraction efficiency was similar to that by the solvent extraction method, giving the recovery percentages from 83 to 96% in a 40 min-extraction time. The fluoroquinolones extracted from eggs by SFE were analyzed simultaneously by HPLC equipped with a fluorescence detector with detection sensitivity at about 10 ppb for the detection limit. The standard calibration profiles of fluoroquinolones showed linear responses to HPLC, showing more than 0.995 for the mean r(2) value. This is the first report of the simultaneous measurement of fluoroquinolones in eggs by a combination of SFE and HPLC. Using the SFE method allowed us to avoid extensive sample preparation such as solvent extraction and chromatographic cleanup that are basically required in extraction of fluoroquinolones.  (+info)

Pesticide residues in canned foods, fruits, and vegetables: the application of Supercritical Fluid Extraction and chromatographic techniques in the analysis. (3/62)

Multiple pesticide residues have been observed in some samples of canned foods, frozen vegetables, and fruit jam, which put the health of the consumers at risk of adverse effects. It is quite apparent that such a state of affairs calls for the need of more accurate, cost-effective, and rapid analytical techniques capable of detecting the minimum concentrations of the multiple pesticide residues. The aims of this paper were first, to determine the effectiveness of the use of Supercritical Fluid Extraction (SFE) and Supercritical Fluid Chromatography (SFC) techniques in the analysis of the levels of pesticide residues in canned foods, vegetables, and fruits; and second, to contribute to the promotion of consumer safety by excluding pesticide residue contamination from markets. Fifteen different types of imported canned and frozen fruits and vegetables samples obtained from the Houston local food markets were investigated. The major types of pesticides tested were pyrethroids, herbicides, fungicides, and carbamates. By using these techniques, the overall data showed 60.82% of the food samples had no detection of any pesticide residues under this investigation. On the other hand, 39.15% different food samples were contaminated by four different pyrethroid residues +/- RSD% ranging from 0.03 +/- 0.005 to 0.05 +/- 0.03 ppm, of which most of the pyrethroid residues were detected in frozen vegetables and strawberry jam. Herbicide residues in test samples ranged from 0.03 +/- 0.005 to 0.8 +/- 0.01 ppm. Five different fungicides, ranging from 0.05 +/- 0.02 to 0.8 +/- 0.1 ppm, were found in five different frozen vegetable samples. Carbamate residues were not detected in 60% of investigated food samples. It was concluded that SFE and SFC techniques were accurate, reliable, less time consuming, and cost effective in the analysis of imported canned foods, fruits, and vegetables and are recommended for the monitoring of pesticide contaminations.  (+info)

Supercritical fluid clean-up of environmental samples for the analysis of polycyclic aromatic hydrocarbons using time-of-flight secondary ion mass spectrometry. (4/62)

A novel sample-pretreatment method for time-of-flight secondary ion mass spectrometry (TOF-SIMS) was developed using supercritical fluid extraction (SFE). In SFE, the extraction efficiency of a certain organic matter is controlled by the pressure and temperature of supercritical CO2. Two-step SFE (1st step at 10 Mpa, 40 degrees C; 2nd step at 30 MPa, 120 degrees C) was applied to diesel exhaust particles containing many kinds of n-alkanes and aromatic species. n-Alkanes and polycyclic aromatic hydrocarbons (PAHs) were extracted in the 1st and 2nd steps, respectively. This selectivity was utilized for the sample preparation of TOF-SIMS analysis. Diesel exhaust particles after the 1st step of extraction were analyzed with TOF-SIMS, aiming at PAHs as analytical targets. The obtained spectrum was simplified, and mass peaks of individual PAHs were easily assigned, because unwanted compounds, like n-alkanes, were selectively removed by SFE. Furthermore, a simple calculation elucidated the outline of the spectrum.  (+info)

Impacts of extraction methods in the rapid determination of atrazine residues in foods using supercritical fluid chromatography and enzyme-linked immunosorbent assay: microwave solvent vs. supercritical fluid extractions. (5/62)

It is an accepted fact that many food products that we eat today have the possibility of being contaminated by various chemicals used from planting to processing. These chemicals have been shown to cause illnesses for which some concerned government agencies have instituted regulatory mechanisms to minimize the risks and the effects on humans. It is for these concerns that reliable and accurate rapid determination techniques are needed to effect proper regulatory standards for the protection of people's nutritional health. This paper, therefore, reports the comparative evaluation of the extraction methods in the determination of atrazine (commonly used in agricultural as a herbicide) residues in foods using supercritical fluid chromatography (SFC) and enzyme-linked immunosorbent assay (ELISA) techniques. Supercritical fluid extraction (SFE) and microwave solvent extraction (MSE) methods were used to test samples of frozen vegetables, fruit juice, and jam from local food markets in Houston. Results showed a high recovery percentage of atrazine residues using supercritical fluid coupled with ELISA and SFC than with MSE. Comparatively, however, atrazine was detected 90.9 and 54.5% using SFC and ELISA techniques, respectively. ELISA technique was, however, less time consuming, lower in cost, and more sensitive with low detection limit of atrazine residues than SFC technique.  (+info)

Stabilized nanoparticles of phytosterol by rapid expansion from supercritical solution into aqueous solution. (6/62)

The basic objective of this work was to form stable suspensions of submicron particles of phytosterol, a water-insoluble drug, by rapid expansion of supercritical solution into aqueous solution (RESSAS). A supercritical phytosterol/CO2 mixture was expanded into an aqueous surfactant solution. In these experiments 4 different surfactants were used to impede growth and agglomeration of the submicron particles resulting from collisions in the free jet. The concentration of the drug in the aqueous surfactant solution was determined by high-performance liquid chromatography, while the size of the stabilized particles was measured by dynamic light scattering. Submicron phytosterol particles (<500 nm) were stabilized and in most cases a bimodal particle size distribution was obtained. Depending on surfactant and concentration of the surfactant solution, suspensions with drug concentrations up to 17 g/dm3 could be achieved, which is 2 orders of magnitude higher than the equilibrium solubility of phytosterol. Long-term stability studies indicate modest particle growth over 12 months. Thus, the results demonstrate that RESSAS can be a promising process for stabilizing submicron particles in aqueous solutions.  (+info)

Isolation of palm tocols using supercritical fluid chromatography. (7/62)

Crude palm oil contains 600 to 1000 ppm of tocols in the form of tocopherols and tocotrienols. These palm tocols have been isolated and analyzed in the past by various chromatographic techniques such as open column chromatography, high-performance liquid chromatography, as well as thin-layer chromatography. Supercritical fluid chromatography (SFC) has emerged as a more advanced chromatographic technique in recent years. The tocols present in palm oil are successfully isolated using SFC. Identification of these tocols is supported by various spectroscopic techniques such as 1H NMR, 13C NMR, and mass spectrometry.  (+info)

Feasibility study of online supercritical fluid extraction-liquid chromatography-UV absorbance-mass spectrometry for the determination of proanthocyanidins in grape seeds. (8/62)

Online coupling of supercritical fluid extraction (SFE) with liquid chromatography (LC)-UV absorbance-electrospray ionization (ESI)-mass spectrometry (MS) is evaluated for the determination of proanthocyanidins in grape seeds. The solid-phase intermediate trap is optimized in order to enhance the collection efficiency for the extracted polar components. Pure supercritical CO2 is used first to remove the oil in the seeds. Then methanol-modified CO2 is used to remove the polar components (e.g., phenolic compounds). Catechin and epicatechin (90%) are extracted out of the de-oiled after 240 min with 40% methanol as a modifier. Both singly-linked (B-type) and doubly-linked (A-type) procyanidins are identified by LC-ESI-MS, as well as their galloylated derivatives. The hyphenated system combines the extraction, separation, and detection in series. The experimental design minimizes the chance of analyte oxidation, degradation, and contamination. The traditional off-line SFE-LC method is also studied for comparison with the online method. Both advantages and disadvantages are observed for the online mode.  (+info)

*Supercritical fluid chromatography

... (SFC) is a form of normal phase chromatography that uses a supercritical fluid such as ... Taylor, Larry T. (2009). "Supercritical fluid chromatography for the 21st century". The Journal of Supercritical Fluids. 47 (3 ... "Integration of supercritical fluid chromatography into drug discovery as a routine support tool". Journal of Chromatography A. ... supercritical fluid chromatography is sometimes called convergence chromatography. SFC is used in industry primarily for ...

*Richard D. Smith

Smith, R. D.; Fjeldsted, J. C.; Lee, M. T.; Felix, W.D. (1982). "Capillary Column Supercritical Fluid Chromatography-Mass ... and Supercritical Fluid Chromatography-MS (1983). He was the recipient of the 2013 Award for a Distinguished Contribution in ... Matson, D.W.; Petersen, R.C.; Smith, R.D. (1986). "Formation of Silica Powders from the Rapid Expansion of Supercritical Fluid ... Matson, D.W.; Petersen, R.C.; Smith, R.D. (1986). "Rapid Precipitation of Low Vapor Pressure Solids from Supercritical Fluid ...

*Supercritical fluid

... chromatography (SFC) can be used on an analytical scale, where it combines many of the advantages of high ... Recent supercritical fluids have shown the capability to reduce particles up to a range of 5-2000 nm. Supercritical fluids act ... "What is a supercritical fluid?". Budapest University of Technology and Economics. Retrieved 2014-06-26. "Supercritical Fluid ... gases and supercritical fluids. In addition, there is no surface tension in a supercritical fluid, as there is no liquid/gas ...

*Atmospheric-pressure laser ionization

D. Klink; O. Schmitz (2016). "SFC-APLI-(TOF)MS: Hyphenation of Supercritical Fluid Chromatography to Atmospheric Pressure Laser ... Couplings with separation methods like Supercritical Fluid Chromatography (SFC) and Chip-Electrospray (Chip-ESI) have also been ... Thiäner, Jan B.; Achten, Christine (2017-03-01). "Liquid chromatography-atmospheric pressure laser ionization-mass spectrometry ... in particular in applications with liquid chromatography (LC-MS) .The selectivity of APLI is one factor contributing to the ...

*Pittcon Editors' Awards

Nexera UC fully automated supercritical fluid extraction - supercritical fluid chromatography - mass spectrometry system; ... AQUITY® QDa™ mass detector for chromatography; Bronze - AB Sciex LLC - CESI-MS system using capillary electrophoresis combined ... 2003: Gold - Dionex Corp - ICS 2000 Reagent-Free ion chromatography system; Silver - Thermo Electron Corp - Finnigan LTQ hybrid ... 2012: Gold - Waters - ACQUITY UPC (UltraPerformance Convergence Chromatography™); Silver - Bruker - SCION TQ triple quadrupole ...

*Chromatography

... or a supercritical fluid (supercritical-fluid chromatography, SFC). The mobile phase consists of the sample being separated/ ... Supercritical fluid chromatography is a separation technique in which the mobile phase is a fluid above and relatively close to ... Size-exclusion chromatography (SEC) is also known as gel permeation chromatography (GPC) or gel filtration chromatography and ... Affinity chromatography Aqueous normal-phase chromatography Binding selectivity Chromatofocusing Chromatography in blood ...

*Waters Corporation

... supercritical fluid chromatography, laboratory informatics, rheometry and microcalorimetry. The business was started by James ( ... The company's first major break came when Dow Chemical bought one of Waters' first gel permeation chromatography instruments, ... Waters markets to the laboratory-dependent organization in these market areas: liquid chromatography, mass spectrometry, ... Empower chromatography and MassLynx mass spectrometry software, Oasis sample preparation products, NuGenesis lab management ...

*Bioanalysis

... gas chromatography) UPLC (ultra performance liquid chromatography) Supercritical fluid chromatography Electrophoresis Ligand ... gas chromatography-mass spectrometry) LC-DAD (liquid chromatography-diode array detection) CE-MS (capillary electrophoresis- ... The first studies measuring drugs in biological fluids were carried out to determine possible overdosing as part of the new ... Initially, nonspecific assays were applied to measuring drugs in biological fluids. These were unable to discriminate between ...

*Interchim

Determination of Uranium by Packed-Column Supercritical Fluid Chromatography - CEA Saclay Robust liquid chromatography-tandem ... and flash chromatography. Interchim developed a unique flash chromatography system (PuriFlashEvo430 - integrated functions). ... The activity in Chromatography spans HPLC, LC/MS, FPLC, MPLC - GC, GC/MS, GPC, GFC - RMN - AA, IR, ICP, UV - SPE. Interchim ... The activity started with distribution of fine chemicals, then chromatography and Biology. Production was developed as well, in ...

*Robert Brownlee

Simulated distillation of high-boiling petroleum fractions by capillary supercritical fluid chromatography and vacuum thermal ... 7, 1992 The Scientist, June, 1990 Robert Brownlee Foundation Chromatography Forum. ... to form the Bay Area Chromatography Colloquium. Bob Stevenson is quoted as saying in his Nine Lives of the California ... a manufacturer of columns and pumps for high performance liquid chromatography systems. Bob Brownlee took the initiative "along ...

*Countercurrent chromatography

History of chromatography Supercritical fluid chromatography Berthod, Alain; Maryutina, Tatyana; Spivakov, Boris; Shpigun, Oleg ... Countercurrent chromatography (CCC, also counter-current chromatography) is a form of liquid-liquid chromatography that uses a ... Unlike column chromatography and high-performance liquid chromatography, countercurrent chromatography operators can inject ... Comparing multilayer toroidal coil chromatography with centrifugal partition chromatography". Journal of Chromatography A. 1218 ...

*Sophora flavescens

"Supercritical fluid extraction of quinolizidine alkaloids from Sophora flavescens Ait. and purification by high-speed counter- ... current chromatography" (PDF). Journal of Chromatography A. 1145: 123-127. doi:10.1016/j.chroma.2007.01.080. A review on ... by high-performance liquid chromatography-electrospray ionization tandem mass spectrometry". Journal of Pharmaceutical and ...

*Tangeretin

... column chromatography preparative-high performance liquid chromatography super critical fluid chromatography high speed counter ... chromatography a combination of vacuum flash silica gel chromatography and flash C8 column chromatography flash chromatography ...

*Supercritical

... carbon dioxide: Supercritical fluid chromatography, a form of liquid chromatography using supercritical carbon ... a Generation IV nuclear reactor concept that uses supercritical water as the working fluid Supercritical flow, where flow ... similar to freeze drying Supercritical fluid, a substance at a temperature and pressure above its thermodynamic critical point ... the bifurcation is called supercritical Pitchfork bifurcation, in mathematics, similar to Hopf bifurcation Super Critical, an ...

*Simulated moving bed

... consumption High product concentration High productivity Continuous process This system is useful in the supercritical fluid ... True moving bed chromatography (TMBC) is only a theoretical concept. Its simulation, SMBC is achieved by the use of a ... A continuous chromatography technique to overcome the two fraction limit and to apply gradients is multicolumn countercurrent ... Chromatography Multicolumn countercurrent solvent gradient purification Bailly, M. and Nicoud, R.-M. (LSGC-ENSIC, 1, rue ...

*Milton L. Lee

In 1984, he co-founded Lee Scientific to develop and market supercritical fluid chromatographic instrumentation and, in 1991, ... Tswett Chromatography Medal (1984), the Keene P. Dimick Chromatography Award (1988), the American Chemical Society Award in ... the Russian Tswett Chromatography Medal (1992), the Martin Gold Medal (1996), the Latin-American Chromatography Congress Medal ... He is a co-founder of Torion Technologies, which markets a hand-portable gas chromatography-mass spectrometry system. He is ...

*Supercritical carbon dioxide

Journal of Chromatography A. 1152 (1-2): 234-246. doi:10.1016/j.chroma.2007.02.046. U.S.EPA Method 3560 Supercritical Fluid ... Yeo, S.; Kiran, E. (2005). "Formation of polymer particles with supercritical fluids: A review". J. Supercrit. Fluids. 34: 287- ... Supercritical carbon dioxide (sCO 2) is a fluid state of carbon dioxide where it is held at or above its critical temperature ... Supercritical CO 2 could be used as a working fluid in enhanced geothermal systems. Possible advantages compared to water ...

*Puerarin

2009). "Investigation of supercritical fluid extraction of puerarin from Pueraria Lobata". Journal of Food Process Engineering ... Journal of Chromatography A. Elsevier. 923 (1 - 2): 255-262. doi:10.1016/S0021-9673(01)00996-7. PMID 11510548. Kintzios, ...

*Supercritical adsorption

There are different tacit understandings of supercritical fluids. For example, "a fluid is considered to be 'supercritical' ... adsorption from supercritical gases in extraction processes and chromatography. Besides, knowledge of gas/solid interface ... Supercritical Adsorption also referred to as the adsorption of supercritical fluids, is the adsorption at above-critical ... Fabrication of block copolymer monolayers by adsorption from supercritical fluids: A versatile concept for modification and ...

*Unsaturated fat

"Optimization of Supercritical Fluid Consecutive Extractions of Fatty Acids and Polyphenols from Vitis Vinifera Grape Wastes". ... In chemical analysis, fatty acids are separated by gas chromatography of methyl esters; additionally, a separation of ... This fatty acid composition results in a more fluid cell membrane but also one that is permeable to various ions (H+ & Na+), ... fluid, heavy whipping nutritiondata.com → Egg, yolk, raw, fresh Retrieved on August 24, 2009 "09038, Avocados, raw, California ...

*Carvacrol

Supercritical carbon dioxide extraction and mathematical modeling of extraction process". The Journal of Supercritical Fluids. ... "Characterization of volatile compounds from ethnic Agave alcoholic beverages by gas chromatography-mass spectrometry". Food ...

*Kava

"Supercritical fluid extraction of kava lactones from Piper methysticum (kava) herb". Hüthig GmbH. doi:10.1002/jhrc.1240201007/ ... using high performance thin layer chromatography (HPTLC)". Food Chemistry. 151: 554-560. doi:10.1016/j.foodchem.2013.11.120. ... Pharmaceutical and herbal supplement companies extract kavalactones from the kava plant using solvents such as supercritical ...

*Superheated water

Oxidation of alkyl aromatics". Journal of Supercritical Fluids. Elsevier. 12 (3): 255-260. doi:10.1016/S0896-8446(98)00084-9. ... permanent dead link] Smith, Roger; Young, E.; Sharp, B. "Superheated water chromatography - flame ionization detection" (PDF). ... Clifford, Tony (Nov 5-8, 2006). "Separations using superheated water". 8th International Symposium on Supercritical Fluids. ... by either extraction alone or extraction linked to supercritical or wet oxidation. Superheated water, along with supercritical ...

*Decaffeination

... and Supercritical Carbon Dioxide method but it is technically known as supercritical fluid extraction. The supercritical CO2 ... many coffee companies choose to employ High-performance liquid chromatography to quantitatively measure how much caffeine ... The extractor is then sealed and supercritical CO2 is forced into the coffee at pressures of 1,000 pounds per square inch ( ... ISBN 978-94-010-4947-4. Lee, S.; Park, M.K.; Kim, K.H.; Kim, Y.-S. (September 2007). "Effect of Supercritical Carbon Dioxide ...

*Fine chemical

... or supercritical fluid (SCF) techniques. For peptides three main types of methods are used, namely chemical synthesis, ... Modern isolation and membrane technologies, like reverse osmosis, ultra- and nano-filtration, or affinity chromatography can ... mostly by chromatography, (4) Formulation, i.e. conversion of the sensitive proteins to a stable form. All steps are fully ... especially when combined with ion exchange chromatography, used, for instance, for amino acids Chemical synthesis and ...

*Perfume

The product of this process is called a "concrete." Supercritical fluid extraction: A relatively new technique for extracting ... Creating perfumes through reverse engineering with analytical techniques such as Gas chromatography-mass spectrometry (GC/MS) ... fragrant compounds from a raw material, which often employs Supercritical CO2. Due to the low heat of process and the ...
33. A. Rajendran, T. Gilkison, M. Mazzotti. Pressure drop effects in supercritical fluid chromatography, 1st International Conference on Supercritical Fluid Chromatography, Pittsburgh USA, Sept 2007 34. W. Chen, A. Rajendran. Optimization of binary separations in supercritical fluid chromatography, 1st International Conference on Supercritical Fluid Chromatography, Pittsburgh USA, Sept 2007 35. W. Chen, M. Aman Ullah, A. Rajendran. Chiral separation of flurbiprofen by supercritical fluid chro- matography, 1st International Conference on Supercritical Fluid Chromatography, Pittsburgh USA, Sept2007 36. A. Rajendran, S. Farooq, V. Kariwala. Blank correction in dynamic column breakthrough experiments, 9th International Conference on Fundamentals Of Adsorption, Sicily Italy, May 2007 37. A. Rajendran, T. Gilkison, M. Mazzotti. Pressure drop effects in supercritical fluid chromatography, 9th International Conference on Fundamentals Of Adsorption, Sicily Italy, May 2007 38. W. Chen, A. Rajendran. ...
[98 Pages Report] Check for Discount on United States Supercritical Fluid Chromatography (Sfc) Market Report 2017 report by QYResearch Group. In this report, the United States Supercritical Fluid Chromatography (Sfc)...
TY - JOUR. T1 - Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange with mass spectrometric analysis. AU - Emmett, Mark. AU - Kazazic, Sasa. AU - Marshall, Alan G.. AU - Chen, Wei. AU - Shi, Stone D H. AU - Bolaños, Ben. AU - Greig, Michael J.. PY - 2006/10/1. Y1 - 2006/10/1. N2 - The single biggest problem with solution-phase H/D exchange as a mass spectrometric probe of surface exposure in a protein (or protein complex) is back-exchange of H for D after the initial H/D exchange has been quenched. Back-exchange results in loss of pertinent data and also greatly hampers data analysis. Previously, very fast, cold (0-4 °C) HPLC was performed to help reduce back-exchange, but calculated back-exchange still averages ∼30%. In this report, supercritical fluid chromatography replaces HPLC as the desalting/separation technique prior to mass analysis, providing a dramatic reduction in back-exchange compared to the fast, cold ...
Palm oil is known to host a variety of phytonutrients; some having antioxidant property such as the carotenes and vitamin E. These antioxidants are also present in the oil recovered from the palm-pressed fibre. Study was carried out to investigate the presence of coenzyme Q10, yet another non-glyceride compound which possesses antioxidant property in crude palm oil (CPO) and palm fibre oil. Separation of coenzyme Q10 in CPO and palm fibre oil was carried out using supercritical fluid chromatography with ultra violet detection. 1H and 13C NMR were used for its characterisation. Calibration with authentic standard shows that there are 10-80 ppm coenzyme Q10 in CPO while its concentration in palm fibre oil is 1000-1500 ppm.
While supercritical fluid chromatography (SFC) has been available for decades, very few labs have chosen to take advantage of its remarkable chromatographic properties. The separation of isomeric compounds that are usually challenging for high.performance liquid chromatography (HPLC) can be accomplished by SFC. Coupling the exceptional chromatographic properties of SFC with the sensitivity of mass spectrometric detection results in a powerful piece of equipment that very few laboratories have utilized. Glycosphingolipids (GSLs) are characteristic components of eukaryotic cells, found in the carbohydrate-rich cell membrane. They represent hundreds of diverse chemical structures composed of different carbohydrate and ceramide moieties. The simplest hexosylceramides (HexCer), which are neutral GSLs, are represented by glucosylceramide (GluCer) and galactosylceramide (GalCer). GluCer and GalCer undergo their own distinctive metabolic pathways that effect different biological responses. GSL ...
Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC is being used routinely for an increasing number of applications.. During the recent years SFC has gained acceptance in drug discovery for high-throughput purification of enantiomers. Hence, pSFC replaces preparative HPLC (pHPLC) as major technology for chiral separations in many pharmaceutical companies. Preparative SFC excels not only at separating and purifying chiral compounds but is also powerful for achiral separations and can be implemented in most steps of drug discovery. It may offer potential advantages over pHPLC for purity upgrading of active pharmaceutical ingredients or drug intermediates, impurity isolation and non-aqueous purification.. The use of pSFC as an alternative option to pHPLC receives also a growing interest for natural products, environmental (pesticides) and petroleum (biofuels) applications. ...
Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC is being used routinely for an increasing number of applications.. During the recent years SFC has gained acceptance in drug discovery for high-throughput purification of enantiomers. Hence, pSFC replaces preparative HPLC (pHPLC) as major technology for chiral separations in many pharmaceutical companies. Preparative SFC excels not only at separating and purifying chiral compounds but is also powerful for achiral separations and can be implemented in most steps of drug discovery. It may offer potential advantages over pHPLC for purity upgrading of active pharmaceutical ingredients or drug intermediates, impurity isolation and non-aqueous purification.. The use of pSFC as an alternative option to pHPLC receives also a growing interest for natural products, environmental (pesticides) and petroleum (biofuels) applications. ...
The effect of pressure drop on the performance of supercritical fluid chromatography systems using a modified mobile phase (carbon dioxide + ethanol) was studied. Experiments were performed on a Lichrospher-RP-18 column with phenanthrene as a solute. A wide range of back pressures (130 to 210 bar) and modifier concentrations (2 to 7% w/w) have been explored. Experiments yielding both small and large pressure drops were performed. From these experiments, parameters to describe pressure drop, retention, and column efficiency were extracted, and were used to simulate the dynamics of the chromatographic column. A good match between the experimentally measured and calculated values of pressure drop, retention times, and column efficiency was observed. At low back pressure and modifier composition, significant loss of column efficiency was observed.
François, I., Dos Santos Pereira, A., & Sandra, P. (2009). Comprehensive and off-line supercritical fluid chromatography: reversed phase liquid chromatography for the analysis of complex triglyceride profiles. High Performance Liquid Phase Separations and Related Techniques, 34th International symposium, Abstracts. Presented at the 34th International symposium on High Performance Liquid Phase Separations and Related Techniques (HPLC 2009 ...
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(PRWEB) September 10, 2014 -- The European Supercritical fluid chromatography reagents report defines and segments the concerned market in Europe with analysis
Mass spectrometry (MS) is a technique widely implemented for the measurement of environmental pollutants. A critical tool for the analysis of persistent organic pollutants (POPs) over several decades, MS as coupled with liquid and gas chromatography (LC and GC) techniques enables the analysis of emerging POPs. The aim of this thesis was to investigate the use of alternative MS-based techniques to assist specific analytical challenges including separation of stereoisomers using supercritical fluid chromatography (SFC), reduced ionization competition with appropriate mobile phase additives, and applied rotationally averaged collision-cross section (CCS) of ions via ion mobility measurements of emerging POPs.. Chromatographic efficiency improvements for the brominated flame retardant, hexabromocyclododecane (HBCDD), were implemented through the development of two supercritical fluid chromatography (SFC) methods. Based on the inherent qualities of supercritical fluids, separation of both predominant ...
Mass spectrometry (MS) is a technique widely implemented for the measurement of environmental pollutants. A critical tool for the analysis of persistent organic pollutants (POPs) over several decades, MS as coupled with liquid and gas chromatography (LC and GC) techniques enables the analysis of emerging POPs. The aim of this thesis was to investigate the use of alternative MS-based techniques to assist specific analytical challenges including separation of stereoisomers using supercritical fluid chromatography (SFC), reduced ionization competition with appropriate mobile phase additives, and applied rotationally averaged collision-cross section (CCS) of ions via ion mobility measurements of emerging POPs.. Chromatographic efficiency improvements for the brominated flame retardant, hexabromocyclododecane (HBCDD), were implemented through the development of two supercritical fluid chromatography (SFC) methods. Based on the inherent qualities of supercritical fluids, separation of both predominant ...
TY - JOUR. T1 - Highly porous organic nanoparticles formed from supercritical carbon dioxide mediated sol-emulsion-gel method. AU - Lee, Jun Young. AU - Kim, Jung Hyun. PY - 2004/5/5. Y1 - 2004/5/5. N2 - Highly porous organic nanoparticles have been prepared by adapting a novel method, sol-emulsion-gel process, through stable dispersion of nanometer-scaled emulsion droplets into continuous phase of supercritical carbon dioxide (ScCO2), sol-gel chemistry in emulsion droplets, and then supercritical drying. This principle offers faithful preparation of nanoparticles (35-90 nm in diameter) having pores of 1-3 nm in radius and high specific surface area (over 2000 m2/g).. AB - Highly porous organic nanoparticles have been prepared by adapting a novel method, sol-emulsion-gel process, through stable dispersion of nanometer-scaled emulsion droplets into continuous phase of supercritical carbon dioxide (ScCO2), sol-gel chemistry in emulsion droplets, and then supercritical drying. This principle offers ...
A specialty phase designed for SFC with a high density Diol surface coverage which ensures separations better and more reproducible than conventional unbonded silica. GreenSep Diol is particularly suitable for acidic and basic analytes.
The piquant and peppery flavor of American Blue and Roquefort cheese is largely due to the short and medium chain fatty acids, methyl ketones and secondary alcohols. The free fatty acids contribute flavor themselves and are also precursors of methyl ketones. Lipase action during the cheese ripening leads to formation of free fatty acids (FFA). The short chain FFA (C6 to C10) are more peppery in flavor than long chain FFA. Conventional methods of FFA analysis suffer from limitations such as loss of volatile fatty acids during 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 procedure was developed utilizing supercritical fluid extraction to isolate the FFA and subsequently separate and quantitate the FFA with supercritical fluid chromatography. The ...
The solubility of heptanoic acid and octanoic acid in supercritical carbon dioxide has been determined at temperatures of (313.15, 323.15, and 333.15) K over a pressure range of (8.5 to 30.0) MPa, depending upon the solute. The solubility of heptanoic acid ranged from a solute concentration of (0.08 ± 0.03) kg • m -3 (T = 323.15 K, p = 8.5 MPa) to (147 ± 0.2) kg • m -3 (T = 323.15 K, p = 20.0 MPa). The lowest octanoic acid solubility obtained was a solute concentration of (0.40 ± 0.1) kg • m -3 (T = 333.15 K, p = 10.0 MPa), while the highest solute concentration was (151 ± 2) kg • m -3 (T = 333.15 K, p = 26.7 MPa). In addition, solubility experiments were performed for nonanoic acid in supercritical carbon dioxide at 323.15 K and pressures of (10.0 to 30.0) MPa to add to the solubility data previously published by the authors. In general, carboxylic acid solubility increased with increasing solvent density. The results also showed that the solubility of the solutes decreased with ...
TY - JOUR. T1 - Highly Fluorous Complexes of Ruthenium and Osmium and Their Solubility in Supercritical Carbon Dioxide. AU - Berven, Bradley. AU - Koutsantonis, George. AU - Skelton, Brian. AU - Trengove, R.D.. AU - White, Allan. PY - 2009. Y1 - 2009. N2 - A series of ruthenium and osmium complexes containing highly fluorous diphosphine ligands FPPF = (F13C6C6H4-p)2P(CH2)2P(p-C6H4C6F13)2 (dfppe) and (F13C6C6H4-p)2P(CH2)3P(p-C6H4C6F13)2 (dfppp) has been prepared. The fluorous diphosphine ligands incorporate four C6F13 "fluoro-ponytails", and these have been effective in solubilizing the complexes in supercritical carbon dioxide (scCO2). Precise solubility measurements in scCO2 were performed for some of the complexes. The new complexes [MX2(FPPF)2] and [MX(FPPF)(η-C5H5)], M = Ru, Os, X = Cl, Br, have been characterized by a number of spectroscopic techniques and their electrochemical properties measured, three of the ruthenium complexes also being characterized by single-crystal X-ray studies. ...
The effects of microwave irradiation (2.45 GHz, 200 W) on glycosylation promoted by a solid super acid in supercritical carbon dioxide was investigated with particular attention paid to the structure of the acceptor substrate. Because of the symmetrical structure and high diffusive property of supercritical carbon dioxide, microwave irradiation did not alter the temperature of the reaction solution, but enhanced reaction yield when aliphatic acceptors are employed. Interestingly, the use of a phenolic acceptor under the same reaction conditions did not show these promoting effects due to microwave irradiation. In the case of aliphatic diol acceptors, the yield seemed to be dependent on the symmetrical properties of the acceptors. The results suggest that microwave irradiation do not affect the reactivity of the donor nor promoter independently. We conclude that the effect of acceptor structure on glycosylation yield is due to electric delocalization of hydroxyl group and dielectrically symmetric
Effect of supercritical carbon dioxide on micro-mechanical properties of electrodesposited goldEffect of supercritical carbon dioxide on micro-mechanical properties of electrodesposited gold ...
In 1822, almost 200 years ago, Baron Charles Cagniard de Latour (1777-1859) discovered the critical phenomena or critical state [1] [2]. At that time, it was described as a curiosity. However, it is now used as an advanced extraction and analytical technology in industry and research. Extraction with supercritical fluids (SFs) was welcome from the very beginning. In the present paper, the application to chromatography of the critical phenomena of compressed gases or overheated liquids as supercritical fluids will be discussed. Supercritical Fluid Chromatography (SFC) received an uneasy welcome, mainly because of the lack of commercially available analytical instruments. Even today, only a small number of industrial companies are manufacturing SFC instrumentation. A very small spectrum of columns is manufactured specially for SFC. SFC is not accepted by Pharmacopeia committees for the analysis of drugs and medical forms to the same extent as Gas Chromatography, High-Performance Liquid Chromatography or
Alibaba.com offers 198 supercritical co2 fluid extraction device products. About 56% of these are other pharmaceutical machinery, 1% are oil pressers, and 1% are laser beauty equipment. A wide variety of supercritical co2 fluid extraction device options are available to you,
The presence of carbon dioxide in natural gas, synthetic gas and liquid streams has prompted the industrial community to examine the properties of carbon dioxide mixtures with the intent of finding novel methods for removing this acidic impurity. Carbon dioxide is also of interest to researchers because it possesses a readily accessible critical point. This has stimulated studies of the phase behaviour and thermodynamic properties of supercritical fluid mixtures, particularly in systems used in supercritical fluid chromatography (SFC) and supercritical fluid extraction (SFE). For both of these applications, it is important to obtain information pertaining to the vapour-liquid phase boundaries for the carbon dioxide mixtures and their thermodynamic properties over a wide range of pressure and temperature. The (CO: + MeOH) system is of interest to applied research on fluid properties because the pure liquids have widely differing critical points. -- There are many experimental issues associated ...
The aim of this work was to evaluate the potential of supercritical carbon dioxide (CO2) to extract Fatty Acid Methyl Esters (FAME) from the microalgae Nannochloropsis oculata (N. oculata) at low temperatures (37 and 55 oC) and pressures (5.9 and 7.6 megapascals (MPa)). A qualitative gas chromatography (GC) analysis showed that the individual FAMEs extracted varied depending on the co-solvent (methanol or hexane) used with supercritical CO2. Using hexane, FAME compounds produced were similar to those extracted with soxhlet extraction alone while longer chain FAME were produced when methanol was the co-solvent. The effects of pressure and temperature variations were shown to be of statistical significance. The chromatograms produced in this work demonstrate that altering one of these parameters (co-solvent, temperature, pressure) can produce different compounds owing to the tunability of the technique.
The effects of organic modifier and temperature on the enantioseparation of 10 triazoles and eight imidazoles, using supercritical fluid chromatography with the Chiralpak AD column, have been investigated in this work. For this purpose four different organic modifiers (methanol, ethanol, 2-propanol and acetonitrile) were evaluated. Only in the case of two compounds could the enantiomeric separation not be achieved with any of the modifiers tested; the rest of compounds were baseline or partially resolved with at least one of the modifiers. The alcohol-type modifiers provided the best results in terms of retention time and resolution. In general, retention increased in the order methanol | ethanol | 2-propanol; moreover it was possible to establish a relationship between the retention and the number of aromatic rings and dioxolane groups in the molecule, that is, the higher the number is, the higher the retention time. From the study of the temperature effect, the enthalpy-entropy compensation was
The first three chapters of the book discuss the various chromatographic and mass spectroscopic techniques now available. Chapters 3-8 cover the complementary methods, based on the combination of mass spectroscopy with various chromatographic techniques such as high-performance liquid chromatography, gas chromatography and supercritical fluid chromatography.
The first three chapters of the book discuss the various chromatographic and mass spectroscopic techniques now available. Chapters 3-8 cover the complementary methods, based on the combination of mass spectroscopy with various chromatographic techniques such as high-performance liquid chromatography, gas chromatography and supercritical fluid chromatography.
Supercritical fluid chromatography (SFC) is an orthogonal technique to UHPLC. In recent years, SFC has demonstrated potential for use in the analysis of a broad variety of analytes of different polarities, if modifiers and additives are utilized as additional mobile phase constituents. However, to date, little research has been carried out on ion-exchange separation of highly polar and ionic analytes using SFC. The objective of this work was to investigate the elution characteristics of polar compounds using SFC combined with tandem mass spectrometry. Highly polar and even ionic drugs and metabolites, with a diversity of functional groups such as gamma-hydroxybutyrate (GHB), gamma-butyrolactone, GHB-glucuronide, ethyl sulfate, ethyl glucuronide as well as meldonium and gamma-butyrobetaine, were selected for the study. To investigate the chromatographic behavior of the solutes using SFC, a systematic chromatographic method development workflow including a basic validation in human urine was ...
In this project the photodegradation of 3,5-diamino-6-chloro-N-(2-(methylamino)ethyl)pyrazine-2-carboxamide was studied. A hypothetical degradation pattern for the compound was proposed and the aim of the project was to study the formed secondary photodegradants and to, if possible, structure elucidate some of these compounds. In order to do this, the parent compound was photodegraded in two steps, where a primary photodegradant was isolated using semi-preparative supercritical fluid chromatography (SFC) and then further degraded into the secondary photodegradants.. The photodegradation was first carried out in aqueous solution, where the parent compound was irradiated in UV-A light of 300-400 nm. This resulted in a primary photodegradant with a molecular ion of m/z = 227, where the chloride in position 6 of the pyrazine group had been replaced by a hydroxyl group. During the large scale photodegradation, prior to the preparative purification, the yield of primary photodegradant was very low due ...
A review on the use of packed capillary columns in gas chromatography (GC) is presented. Several articles on the invention of packed capillary columns have been published, as well as on the progress and the development of this technology. Practical applications by this technique have also been studied, especially in the period from 1996 and onwards. A recently developed technique, solvating gas chromatography (SGC), which uses CO2 as the mobile phase combined with a high inlet pressure, has received specific focus.. The use of packed capillary columns in GC has also been evaluated. The technique used to pack these columns has been developed from a similar technology, which have been used for packing of columns, achieving very good separations, for both supercritical fluid chromatography (SFC) and high performance liquid chromatography (HPLC). In the present work, the possibilities of using packed capillary columns in GC, without applying a higher inlet pressure than 5 bar, has been explored. A ...
The goal of this PhD work is to evaluate the possibilities of supercritical fluid chromatography (SFC) in the pharmaceutical analysis. This chromatographic approach will be used to develop analytical methods for numerous types of drugs (including chiral ones) in pharmaceutical formulations. Some inventive strategies will be developed to maximize performance and apply SFC to the widest possible range of molecules. The performance of SFC will be systematically compared to liquid chromatography (LC). In parallel, the PhD candidate will also have the opportunity to couple SFC with single quadrupole(MS), triple quadrupole (MS/MS) and high resolution (QqTOF/MS) mass spectrometers available in our laboratory. This instrumental setup will be used for the determination of drugs and metabolites in complex matrixes, such as biological fluids.. ...
Detection of drugs at low concentration is required in a variety of biological and medical situations, in order to avoid harmful side effects posed by some drug residues. The book details the instrumentation, detection, and application of nano chromatography (that is, any chromatographic and capillary electrophoretic method dealing with the detection of a sample at nano gram per liter or lower) and capillary electrophoresis in the analyses of biological and environmental samples. Methods discussed include: Nano Gas Chromatography, Nano Capillary Electrophoresis, Nano Chiral Chromatography, Micellar Electrokinetic Chromatography, Supercritical Fluid Chromatography, and Nano High Performance Liquid Chromatography.. ...
D6550 Standard Test Method for Determination of Olefin Content of Gasolines by Supercritical-Fluid Chromatography D6591 Standard Test Method for Determination of Aromatic Hydrocarbon Types in Middle Distillates-High Performance Liquid Chromatography Method with Refractive Index Detection. D6750 Standard Test Methods for Evaluation of Engine Oils in a High-Speed, Single-Cylinder Diesel Engine-1K Procedure (0.4 % Fuel Sulfur) and 1N Procedure (0.04 % Fuel Sulfur). D6987/D6987M Standard Test Method for Evaluation of Diesel Engine Oils in T-10 Exhaust Gas Recirculation Diesel Engine. D7347 Standard Test Method for Determination of Olefin Content in Denatured Ethanol by Supercritical Fluid Chromatography. D7422 Standard Test Method for Evaluation of Diesel Engine Oils in T-12 Exhaust Gas Recirculation Diesel Engine. D7484 Standard Test Method for Evaluation of Automotive Engine Oils for Valve-Train Wear Performance in Cummins ISB Medium-Duty Diesel Engine. D7549 Standard Test Method for Evaluation of ...
Surpercritical CO2 reactor Surpercritical CO2 extractor Surpercritical CO2 phase monitor Investigator Supercritical fluid Chromatography System A series of high pressure reactors (Endeavour, HEL, Parr, Autoclave Engineers) REACT IR Several LC-MS Several GC-MS Several flash chromatography separation systems NMR facility Mass spectrometry facility Solvent purification systems
Phytantriol-based organogels as a new type of immobilisation matrix were tested for their potential application as solid-phase catalysts with both isooctane and supercritical carbon dioxide as external solvents. It was shown that Mucor miehei lipase immobilised in such organogels is capable of catalysing the esterification of 1-propanol and lauric acid in both solvents. In order to determine the operational stability of the immobilised lipase in phytantriol-based organogels, reuse experiments were conducted in isooctane. They showed that the catalytic activity is quite well preserved despite the fact that a loss of phytantriol occurs due to its extraction from the gel ...
The solubility of an anthraquinone dye, 1,4-bis-(n-propylamino)-9,10-anthraquinone in supercritical carbon dioxide have been correlated with two equation of state. All critical properties have been estimated with a group contribution method (GCM). As far we know, solubility data for this dye never has been correlated using an equation of state (EOS). Therefore, it is worthwhile to model the solubility of this dye. In this work, the aim is correlating reported data with a new EOS and comparing obtained results with the results of Peng-Robinson EOS (PR-EOS) together with two adjustable parameter van der Waals mixing and combining rules. The calculated results showed that new EOS is more accurate than PR-EOS ...
A series of ruthenium and osmium complexes containing highly fluorous diphosphine ligands FP∧PF = (F13C6C6H4-p)2P(CH2)2P(p-C6H4C6F13)2 (dfppe) and (F13C6C6H4-p)2P(CH2)3P(p-C6H4C6F13)2 (dfppp) has been prepared. The fluorous diphosphine ligands incorporate four C6F13 "fluoro-ponytails", and these have been effective in solubilizing the complexes in supercritical carbon dioxide (scCO2). Precise solubility measurements in scCO2 were performed for some of the complexes. The new complexes [MX2(FP∧PF)2] and [MX(FP∧PF)(η-C5H5)], M = Ru, Os, X = Cl, Br, have been characterized by a number of spectroscopic techniques and their electrochemical properties measured, three of the ruthenium complexes also being characterized by single-crystal X-ray studies. The noncovalent interactions observed in the X-ray structures have been analyzed by the Hirshfeld surface approach, putting them on a more solid footing. The fluorinated complexes show significantly different solvation properties from those of the ...
Supercritical Carbon Dioxide Brayton cycles can be used in conjunction with a host of heat sources associated with different magnitudes of net power generation. In this paper, the overall design features of the turbomachinery, namely the turbine and compressor are evaluated for kilowatt to Gigawatt range of net cycle power using a commercial design tool - AxSTREAM®. The thermodynamic cycle considered in all cases is a simple recuperated Brayton cycle with turbine and compressor inlet temperatures of 540 °C and 45 °C respectively. The highest and lowest pressures in the cycle are 210 bar and 85 bar respectively. The preliminary design is carried out using an inverse algorithm with a meanline solver that generates many geometries for the given boundary conditions using standard loss correlations to account for different losses in turbomachines. It, thus, provides the general design features of the compressor and turbine which include - machine size, shaft speed at design point, overall ...
Author: Pandey, S. et al.; Genre: Journal Article; Published in Print: 2002-02-21; Title: The photophysics of 6-(1-pyrenyl)hexyl-11(1-pyrenyl)undecanoate dissolved in organic liquids and supercritical carbon dioxide: Impact on olefin metathesis
The target of this project is the screening of the opportunities, resulting of the combination of treating Cellulosic bodies with supercritical carbon dioxide. In general, the change of the porous structure depending on the way of fiber drying and the opportunity to incorporate active compounds and the development of analytical methods to track them within Cellulosic bodies.
This Tutorial Review focuses on supercritical carbon dioxide (scCO2), and discusses some of the problems that have frustrated its wide use on an industrial scale. It gives some recent examples where strategies have been developed to reduce the energy requirements, including sequential reactions and gas-expan Green Chemistry
Enzymes have been used in supercritical carbon dioxide (scCO2) rather than in the conventional media to make enzyme reactions greener. This review introduces some enzymatic asymmetric synthesis in scCO2 such as esterification by a lipase and reduction by an alcohol dehydrogenase. A carboxylation by a decarbo
The magnitude of the contaminated site clean-up in the United States indicates the need for more effective, less costly remediation technologies. Supercritical Fluid Extraction (SFE) using carbon dioxide (CO2) as a supercritical fluid is a possible alternative technology for remediation of soils contaminated with volatile organic compounds. The feasibility of this process is mainly dependent on two factors: the extent and extraction rate of heavy molecular weight organic compounds from soil by supercritical carbon dioxide (SC-CO2). This paper presents results of a bench-scale study for remediation of soils contaminated with naphthalene and 1,2,4 trimethyl benzene as a function of the flow rate (QCO2) and supercritical fluid density (pCO2). These data are used to perform a basic economic analysis of the process by using these two organics selected as model soil contaminants. An additional aim of this study was to develop scale-up methodology from laboratory SFE devices to industrially ...
The introduction of polar cosolvents is not only able to dramatically increase solubilities of polar organic solids in supercritical CO2 but also can make supercritical CO2 extraction more attractive in various separation applications. In this study, we have measured the solubility of aspirin in methanol-modified and ethanol-modified supercritical CO 2 by means of a dynamic saturation method. Experimental results show the aspirin solubility can be greatly enhanced up to 14 times by introducing 3.0 mol% methanol or ethanol. This enhancement, as believed, is mainly attributed to the strong attractive molecular interactions between the polar cosolvent and the polar solute. The aspirin ternary solubility data are fairly well described by using the Peng-Robinson equation of state model with an AARD ranging from 14 to 23%. © 2005 Elsevier B.V. All rights reserved ...
A small amount of a co-solvent increases the ability of supercritical carbon dioxide to dissolve polar compounds. Neat supercritical CO2 has dissolving properties similar to hexane. This means that, by itself, carbon dioxide is very good for dissolving relatively non-polar materials. The addition of just a small quantity of co-solvent enhances the solubilizing power of the supercritical carbon dioxide, making it possible to extract much more polar molecules. Typical co-solvents include: methanol, ethanol, and water.. Co-solvent addition is typically done using an HPLC type pump. There are two traditional methods a co-solvent pump can be used. Firstly, as a co-solvent doping module where co-solvent is added to the sample to a desired % of the vessels overall volume and then the CO2 pump is actuated to bring the vessel up to the desired set pressure for extraction. Secondly, the CO2 and co-solvent pump are both actuated at the same time with the restrictor valve open to maintain a set ratio of ...
SFE uses supercritical CO2, instead of organic solvents such as hexane and methylene chloride, to extract chemical compounds from a solid matrix (sometimes also from liquids). Near the critical point the density of a SCF is extremely sensitive to minor changes in temperature and pressure. Since the solvating power of a SCF is directly related to its density, selective extraction of the analyte of interest can be achieved by making slight changes in temperature and pressure and exploiting the differential solubility of analytes in the SCF. On the other hand, due to the higher diffusion coefficients in supercritical fluids, SFE is faster than liquid extraction. SFE is also a more efficient extraction method since the lower surface tension of supercritical fluids allows penetration into small pores of the solid matrix which are not accessible to liquids. ...
SARMENTO, C. M. P.; FERREIRA, S. R. S. and HENSE, H.. Supercritical fluid extraction (SFE) of rice bran oil to obtain fractions enriched with tocopherols and tocotrienols. Braz. J. Chem. Eng. [online]. 2006, vol.23, n.2, pp.243-249. ISSN 0104-6632. http://dx.doi.org/10.1590/S0104-66322006000200012.. Parboiled rice bran oil was obtained with supercritical CO2 at temperatures and pressures varying from 25 to 60ºC and from 150 to 250 bar, respectively. This study was divided into two different parts: initially, the experiments were carried out with one separation step. In the second part, experiments were performed with two separators in series. The temperatures and the pressures of the first separator were 25 and 40ºC, and 100 and 150 bar. The second separator was maintained at 2ºC and 25bar. This procedure results in the precipitation of rice bran oil with different concentrations of tocols in the first and second separators. The extracts obtained were analyzed by HPLC to verify the presence ...
Reliable mathematical models for supercritical extraction process can be developed that include all these parameters. Mathematical models can be used to generalize the experimental results to new process conditions and extracted materials. Even more, they are useful to develop scale-up procedures from laboratory to pilot and to industrial scale. Different approaches have been proposed to obtain mathematical models that simulate supercritical fluid extraction from solid particles (Brunner, 1994; Reverchon, 1997; Goto et al., 1998). In this work, differential mass balances are used to elaborate a model that takes into account the following mechanisms: i)the dissolution of solid or liquid component into supercritical fluid filling the particle pores, ii)diffusion through porous cellular material and iii)external mass transfer around the solid particle to the main fluid stream. The resulting equations are solved using numerical techniques. Results obtained during the extraction of essential oil from ...
Information about the paper titled APPLICATION OF GREEN TECHNOLOGY TO ENHANCE STUDENT LEARNING: SUPERCRITICAL FLUID CARBON DIOXIDE EXTRACTION at IATED Digital Library
Umbilicaria Tornata specifications & features from suppliers/manufacturer Umbilicaria tornata had on the growth of Chinas wild forests DaXingAnLing as rawmaterials, supercritical carbon dioxide extraction of the introduction of moderntechnology-based active ingredients in a water-soluble polysaccharide powerfulintegrated
Mars is a CO2-abundant planet, whereas early Earth is thought to be also CO2-abundant. In addition, water was also discovered on Mars in 2008. From the facts and theory, we assumed that soda fountains were present on both planets, and this affected amino acid synthesis. Here, using a supercritical CO2/liquid H2O (10:1) system which mimicked crust soda fountains, we demonstrate production of amino acids from hydroxylamine (nitrogen source) and keto acids (oxylic acid sources). In this research, several amino acids were detected with an amino acid analyzer. Moreover, alanine polymers were detected with LC-MS. Our research lights up a new pathway in the study of lifes origin.
In the perspective of production of dry therapeutic protein formulations, spray drying of lysozyme (as a model protein) into Supercritical carbon dioxide was studied. The effects of the nozzle (i.e., co-current coaxial converging and converging-diverging, and T-mixer impinging) and process conditions (i.e., flow rates, pressure) on the drying of the lysozyme prepared in aqueous solution dried with supercritical carbon dioxide enriched with ethanol were investigated. The particle size distribution, width of particle size distribution and morphology were used to determine the effect of the various parameters assessed. Particles with a median size of similar to 1.5, similar to 5 or similar to 25 mu m were produced depending of the nozzle selected. A basic comparative study of the nozzle was done by computational fluid dynamics, but the differences in particle size could not be depicted by these computations. The proportional increase of the flow rates (tip to fivefold) caused a decrease in particle ...
Carbon dioxide (CO2) extraction involves turning CO2 from a gaseous state to a supercritical liquid state. This is done in two stages.
Changes of petrophysical, petrological, mineralogical, mechanical and chemical parameters were studied on sandstones from the Hessian Depression and sandstones from Neidenbach (Eifel) before and after alteration with CO2. The experiments were performed in a wide pressure and temperature range (10 ,P ,20 MPa; 100 ,T ,200 °C) to cover the conditions of most promising deep saline aquifers, with the consequence that CO2 is above the critical point and thus in supercritical state (scCO2). The experiments lasted from 10 days up to more than 6 months. In repeated experiments samples were analysed after every 2 to 6 weeks reaction time. Experiments were performed in two different setups: (1) the pore volume was fully saturated with a CO2-saturated artificial brine (3M NaCl-solution), and (2) the pore volume was partially saturated with brine and in direct contact with wet CO2. Petrophysical properties, mineralogical composition, heterogeneity and anisotropy of the samples were measured before and after ...
Hi. I am trying to find information with no luck on google. I am hoping someone here can help point me to any articles or books that talk about how carbon...
ABSTRACT. The study reports supercritical fluid extraction (SFE) of pesticides in sediment samples from the Okavango Delta, the headwaters of which originate from Angola and traverse through Namibia into Botswana. An acetone modifier and fractional extraction by pressure ramping gave recoveries ranging from 55 to 86% for the 15 pesticides studied. Hexachlorobenzene (HCB), aldrin and 4, 4-dichlorodiphenyltrichloroethane (4, 4-DDT) were identified at concentration ranges of 1.1 to 30.3, 0.5 to 15.2 and 1.4 to 55.4 µg/g, respectively by gas chromatography with electron capture detection (GC-ECD) and were unequivocally confirmed by gas chromatography time-of-flight mass spectrometry (GC-ToF-MS). The study indicated an increase of pesticide concentrations in the direction of water flow from the Panhandle (point of entry) to the lower delta. The results show that there are ramifications associated with activities either upstream or downstream; hence close monitoring is required for the long-term ...
Statistics Report for : Supercritical fluid extraction as a tool for isolation of monoterpenes from coniferous needles and walnut-tree ...
|p|Ground spice paprika was extracted with hexane, by conventional Soxhlet procedure (SX oleoresin), and with supercritical carbon dioxide at three different pressures - 20, 30 and 40 MPa (SF20, SF30 and SF40 oleoresins). The effect of extraction method and conditions on the colour intesity of paprika oleoresins, content of α-tocopherol, as well as antioxidant and antiproliferative activity was examined. Hexane showed highest selectivity for paprika pigments (886.02 ASTA), while α-tocopherol showed highest solubility (3846.9 mg kg−1) in supercritical carbon dioxide at 20 MPa. All paprika oleoresins exhibited good superoxide anion radical scavenging activity SF30 being the best superoxide anion radical scavenger. Cell growth activity was evaluated in vitro in human cell lines:cervix epitheloid carcinoma (HeLa), breast adenocarcinoma (MCF7) and colon adenocarcinoma (HT-29). The highest antiproliferative activity was exhibited by SX in MCF7 cell line (IC50=14.28 mg mL−1). Extract
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TY - GEN. T1 - Electropolymerization of thiophene having porphyrin group and its application to superoxide sensor. AU - Hoshino, Manabu. AU - Murata, Hidenori. AU - Oyaizu, Kenichi. AU - Yuasa, Makoto. PY - 2006. Y1 - 2006. N2 - Iron 5-(3-thienyl)-10,15,20-triethylporphyrin was electropolymerized in supercritical carbon dioxide (scCO2) to yield the corresponding conductive polymer film. The film was analyzed by scanning electron microscopy, laser microscopy and AFM. It was revealed that the thiophene-porphyrin film synthesized in scCO2 was more dense and smoother than those synthesized in dichloromethane. The electrocatalyst was applied to a superoxide anion radical sensor, and its detection sensitivity was drastically increased.. AB - Iron 5-(3-thienyl)-10,15,20-triethylporphyrin was electropolymerized in supercritical carbon dioxide (scCO2) to yield the corresponding conductive polymer film. The film was analyzed by scanning electron microscopy, laser microscopy and AFM. It was revealed that ...
The Sodium-Cooled Fast Reactor (SFR) and the Supercritical Carbon Dioxide (S-C0₂) Recompression cycle are two technologies that have the potential to impact the power generation landscape of the future. In order for their implementation to be successful, they must compete economically with existing light water reactors and the conventional Rankine cycle. Improvements in efficiency, while maintaining safety and proliferation goals, will allow the SFR to better compete in the electricity generation market. These improvements will depend on core design as well as the balance of plant, including the choice of steam or C0₂ as the working fluid. This work has developed some of the tools necessary for evaluating different design core and balance of plant options. Much of it has concentrated on the S-C0₂ Recompression cycle. S-C0₂ promises to be useful as a working fluid in high-efficiency power conversion systems for SFRs because it achieves higher efficiencies at the high temperatures ...
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Micronization processes by supercritical fluid technologies: a short review on process design (2008-2012). Priamo, Wagner Luiz; Dalmolin, Irede; Boschetto, Daiane Lúcia; Mezzomo, Natália; Salvador Ferreira, Sandra Regina; Oliveira, Jose Vladimir // Acta Scientiarum: Technology;Oct-Dec2013, Vol. 35 Issue 4, p695 Several micronization processes based on supercritical fluids have been developed. These processes can be classified according to the role of the supercritical fluid in the process: solvent, solute or co-solvent, and anti-solvent. Application of supercritical fluids as alternative to traditional... ...
The present invention is an apparatus for extracting organic compounds from solid materials. A generator vessel has a removable closure for receiving a solid or liquid solvent which is heated with a resistive heating element to a gaseous or supercritical phase. The removable closure is unencumbered because the side wall is penetrated with an outlet for the gaseous or supercritical solvent. The generator vessel further has a pressure transducer that provides an electronic signal related to pressure of the gaseous or supercritical solvent. The apparatus of the present invention further includes at least one extraction cell having a top and a bottom and a wall extending therebetween, wherein the bottom is sealably penetrated by an inlet for gaseous or supercritical solvent received through a manifold connected to the outlet, the top having an easy-open removable closure cap, and the wall having an outlet port. Finally, a permeable sample cartridge is included for holding the solid materials and to
In the present work, two-dimensional systems based on biodegradable polymers such as poly(ε-caprolactone) (PCL), poly(ethylene oxide) (PEO) and polylactic acid (PLA) are fabricated by means of a sustainable approach which consists in inducing phase separation in solutions of such polymers and "green" solvents, namely ethyl lactate (EL) and ethyl acetate (EA). The extraction of the solvent is promoted by a controlled drying process, which is performed in either air or supercritical CO{sub 2}. The latter can indeed act as both an antisolvent, which favors the deposition of the polymer by forming a mixture with EL and EA, and a plasticizing agent, whose solvation and transport properties may considerably affect the microstructure and crystallinity of the polymer films. The morphological, topographical and crystalline properties of the films are tailored through a judicial selection of the materials and the processing conditions and assessed by means of thermal analyses, polarized optical ...
en] This work deals with the preparation and characterization of fire-resistant poly(styrene coacrylonitrile) (SAN) foams containing (organo)clays and/or melamine polyphosphate (MPP) as fire retardants using supercritical CO2 as the foaming agent. The additives dispersion was first characterized with X-ray and transmission electron microscopy (TEM) analyses. Their presence clearly affected the cellular morphology, as observed by scanning electron microscopy (SEM). Then, the peak of heat release rate (PHRR) and total heat evolved (THE) were determined with a cone calorimetry test, performed on each foamed sample as a function of the foam density. Incorporation of clay (3 and 5 wt%) in the exfoliated state into the SAN foam clearly led to a significant decrease of PHRR, while intercalated and aggregated clay had a lower effect. Similar results were obtained with 10 and 20 wt% of MPP. The best results were obtained when exfoliated clay and MPP were combined, with a PHRR drop as large as 75%, thanks ...
PRODUCTION OF NANO PARTICLES USING SUPERCRITICAL CO2. By Satya Chaitanya Class 702 - Modules in nano pharmaceuticals Dr.Rajesh Dave. What is S uper C ritical F luid? A fluid is compressed beyond its Pc and heated beyond its Tc. Why we choose CO2: Slideshow 526110 by jacques
Looking for Deodorization? Find out information about Deodorization. the artificial removal or masking of unpleasant-smelling gaseous substances that are formed as a result of the putrefaction of organic substrates .... Explanation of Deodorization
In summary, supercritical methanol acts not only as the reaction medium but also the reducing agent, in synthesis of pure metal particles. Thus, Ni particles were synthesized without addition of reducing agent. In addition, phase-controlled synthesis of Ni particles was achieved by changing starting materials. For metal oxides such as CeO2 and ZnO, morphology and size of particles were controlled by surface modifiers such as decanoic acid, oleic acid and CTAB. Barium titanate, one of important ferroelectric nanoparticles was synthesized in supercritical water, and it was observed that reaction time and molar ratio of barium hydroxide to anatase affect conversion of anatase. Adding KOH achieved the BaTiO3 nanoparticles with the high purity. Hydrothermal/solvothermal method using supercritical fluid provides effective process to synthesize metal/metal oxide nanoparticles. As mentioned previously, process using supercritical fluid need short reaction time and can eco-friendly process ...
The use of supercritical fluids in analytical chemistry is still grow- ing. More and more analysts are discovering the favorable advan- tages for a number of applications. Especially supercritical flu
The main aim of the thesis was to explore the potential of supercritical fluid (SF) techniques in the field of drug delivery. In particular, the relatively recently developed solution-enhanced dispersion by supercritical fluids (SEDS) technology has been employed in the preparation of particles/powders. The manufacturing, stability and bioavailability of a dosage form strongly depend on the physicochemical properties of the formulation particles. For example, dry powder inhalation (DPI) for administering drugs to the respiratory tract require particles in a narrow size range (1-5 μm) to be effective. The identification of polymorphs and control of purity are also important issues since the physicochemical properties and therapeutic effects of the alternative forms of a drug may differ substantially. Solvent-based traditional crystallisation processes provide the product that may require further down-stream processing to obtain particles for advanced drug delivery applications. This can result ...
An apparatus and method for processing materials in supercritical fluids is disclosed. The apparatus includes a capsule configured to contain a supercritical fluid, a high strength enclosure disposed about the capsule and a sensor configured to sense pressure difference between an interior and an exterior of the capsule. The apparatus also includes a pressure control device configured to adjust pressure difference of the capsule in response to the pressure difference sensed by the sensor. The apparatus further includes at least one dividing structure disposed within the capsule that divides the capsule into a seed growing chamber and a nutrient chamber.
A preparatory supercritical extraction cartridge includes a chamber for sample having a volume in the range of 20 cubic centimeters to 2,000 cubic centimeters. An inlet and an outlet are fastened to the cartridge walls by threads and sealed to said cartridge walls With spring loaded seals so that they can be removed with a torque requirement of less than 35 pound inches. Inlet and outlet tubing are fastened to the inlet and outlet by quick release connectors.
Supercritical carbon dioxide (scCO2) was used to extract components of interest from Scenedesmus dimorphus, a microalgae species, under varied algal harvesting and extraction conditions. Liquid chromatography-mass spectrometry (LC-MS) was used to quantify the concentration of fatty acid methyl esters (FAME) and the FAME profile of transesterified lipids, phospholipids and pigments extracted under varied supercritical temperatures and pressures. The scCO2 extraction results are compared with conventional solvent extraction to evaluate differences in the efficiency and nature of the extracted materials. Algae harvested by centrifugation (vs. lyophilization) demonstrated a similar extraction efficiency in scCO2, indicating potential energy benefits by avoiding conventional algal mass dehydration prior to extraction. Centrifuged algae and optimized extraction conditions (6000 psi; 100°C) resulted in comparable FAME yields to conventional processes, as well as increased selectivity, reflected in the ...
Summarized supercritical fluid property,supercritical fluid application and supercritical fluid extraction technique. Introduced the present situation that researched in the home and abroad,compendium supercritical fluid technique profit and defect and orientation which will be researched.
In general, diffusion rates in extractions are enhanced by increasing the temperature. In this study, we instead add compressed liquid carbon dioxide to the extraction phase to accomplish faster mass transfer. The feasibility of using carbon dioxide expanded ethanol (CXE) as the extraction phase was explored, targeting two medium-polar analytes, α-pinene and cis-verbenol in Boswellia sacra tree resin. Hansen solubility parameters (HSP) were first calculated for the analytes and the extraction phases investigated, ethanol, CXE, and supercritical carbon dioxide (scCO2) containing ethanol as a cosolvent. Second, an extraction method with CXE as the extraction phase was optimized using a Box Behnken design, giving optimal conditions of 40 °C, 9.3 MPa, and 0.31 molar fraction of CO2 in ethanol. Third, the developed method was compared with a supercritical fluid extraction (SFE) method and a conventional solid liquid extraction (SLE) method, showing that CXE enables faster and more efficient ...
Purchase Supercritical Fluids as Solvents and Reaction Media - 1st Edition. Print Book & E-Book. ISBN 9780444515742, 9780080542102
The precipitation of glycine from aqueous solution was studied using a mixture of supercritical carbon dioxide and ethanol as drying medium and as anti-solvent. Glycine. which has three polymorphs, was precipitated by a direct spraying process using a coaxial nozzle under high pressure. By simple manipulation of the solute concentration, the process could be tuned to selectively precipitate either pure alpha or beta-glycine, as determined by X-ray powder diffraction. When decreasing the solute concentration or increasing the ethanol fraction in the system, the precipitation of the metastable beta-glycine was preferred over the precipitation of alpha-glycine. Modelling of the mass transfer around a drop showed that the ethanol fraction inside the drop can reach significant values, and that the evaporation occurs in less than a second, leaving little space for recrystallisation. Even though the crystal growth rate was extreme (up to 800 mu m/s), the product was crystalline. (C) 2007 Published by ...
The elemental processes and reactions involved in supercritical water oxidations (SCWO) and the mechanism of hydrolysis reactions in sub and supercritical water were studied. The modeling for the reactions and ideal reactor designs were also pursued. It was found that the SCWO reactions belong to the category of radical chain reactions with induction times and are characterized by the autocatalytic features, on which the practical reactor should be designed. During the study, a novel continuous stirred tank-type reaction apparatus was devised, being equipped with a Raman spectroscopic system for in situ measurements of the relevant species. Besides the study of homogeneous SCWO, the reaction engineering analysis was also successfully applied for the heterogeneous SCWO. In parallel with the study of supercritical water reactions, laser induced reactions in supercritical carbon dioxide were investigated. The mechanism of oxygen excitation to induce oxidative reactions was elucidated. All of the ...
A composition containing polyunsaturated fatty acid glycerides is purified by means of supercritical fluid fractionation in one or more countercurrent columns operated either with internal reflux achieved by a temperature gradient along the column or with an external reflux achieved through external regulation of the pressure, and using as the solvent a mixture of supercritical CO2 and a polar co-solvent. Oligomeric and malodorous impurities in particular can be successfully removed by this process, which also can, if desired, be followed, or preceded, by another supercritical fluid fractionation with supercritical CO2 under conditions adjusted so as to favour fractionation of the glyceride components.
Paper samples were rendered superhydrophobic with Alkyl Ketene Dimer using (1) Airblasting with cryo ground micro particles, (2) crystallizing from organic solvents and (3) spraying with Rapid Expansion of Supercritical Solutions (RESS) technique. The papers were characterized using Scanning Electron Microscopy, contact angle to water measurements and X-ray Photoelectron Spectroscopy (XPS). Advancing contact angles were in the region of 150A degrees-160A degrees and receding contact angles were in the region of 110A degrees-130A degrees. Diagrams showing the drop base diameter vs. the contact angle when water is pumped into, and then withdrawn from, a sessile drop show that a stick slip pattern is present in the advancing phase for a non coated internally sized paper. Papers rendered superhydrophobic with the RESS technique showed a much less pronounced stick slip pattern in the advancing phase but still a stick slip pattern in the receding phase.. ...
We measured the change in permeability of two selected sandstones (Berea, Fonteinebleau) due to injection of CO2-saturated ("live") brine, unsaturated ("dead") brine or supercritical (sc) CO2 at reservoir conditions. We found that the permeability did not significantly change in a clean sandstone consisting of pure quartz (Fonteinemebleau) due to live or dead brine injection, although permeability changed due to scCO2 injection by ~23%. The permeability in the Berea sandstone, however, changed due to live or dead brine injection, by up to 35%; this permeability reduction in Berea sandstone was likely caused by fines release and subsequent pore throat plugging as the damage was more significant at higher injection rates. We expect that this phenomenon - i.e. rock permeability reduction due to CO2 injection into the formation - can have a significant and detrimental influence on CO2 injectivity, which would be reduced accordingly.. ...
A method for the pre-treatment of a wafer substrates with exposed metal surfaces is disclosed. The pre-treatment reduces oxidation of the exposed metal surfaces during subsequent supercritical cleaning processes.
Objective(S): In this work, paclitaxel (PX), a promising anticancer drug, was loaded in the basil seed mucilage (BSM) aerogels by implementation of supercritical carbon dioxide (SC-CO2) technology. Then, the effects of operating conditions were studied on the PX mean particle size (MPS), particle size distribution (PSD) and drug loading efficiency (DLE). Methods: The employed SC-CO2 process in this research is the combination of phase inversion technique and gas antisolvent (GAS) process. The effect of DMSO/water ratio (4 and 6 (v/v)), pressure (10-20 MPa), CO2 addition rate (1-3 mL/min) and ethanol concentration (5-10%) were studied on MPS, PSD and DLE. Scanning electron microscopy (SEM) and Zetasizer were used for particle analysis. DLE was investigated by utilizing the high-performance liquid chromatography (HPLC). Results: Nanoparticles of paclitaxel (MPS of 82-131 nm depending on process variables) with narrow PSD were successfully loaded in BSM aerogel with DLE of 28-52%. Experimental results
Waters Supercritical Fluid Extraction (SFE) systems extract chemical compounds using supercritical fluid instead of an organic solvent. The result is an extract with little or no residual solvent, superior purity and yield, and lower operating costs.
There is described a process for separating substantially all the lipids from an aqueous liquid containing lipids comprising contacting the liquid with a subcritical or supercritical fluid at a suitable temperature and pressure and of a type such that at least part of the lipid is more soluble therein than the remaining components of the liquid, under conditions such that some of the lipids in the liquid are taken up by the fluid and then recovering such lipid from that fluid. The process can for example be used to make butter by extracting butter fat from cream using supercritical carbon dioxide.
TY - JOUR. T1 - Lipid removal enhances separation of oat grain cell wall material from starch and protein. AU - Sibakov, J.. AU - Myllymäki, O.. AU - Holopainen, U.. AU - Kaukovirta-Norja, A.. AU - Hietaniemi, V.. AU - Pihlava, J.M.. AU - Poutanen, K.. AU - Lehtinen, Pekka. PY - 2011/7. Y1 - 2011/7. N2 - Effects of lipid removal on the fine milling and air classification processing of oats were studied. Lipid removal by supercritical carbon dioxide (SC-CO2) extraction enabled concentration of the main components of oats - starch, protein, lipids and cell walls - into specific fractions. Using defatted oats as raw material, the highest β-glucan concentration of the cell wall-enriched fraction was 33.9% as compared to 17.1% without lipid removal. This was probably due to more efficient milling yielding smaller particles, and release of starchy material from cellular structures during milling of defatted oats, resulting in better classification. The removal of lipids also enabled separation of an ...
China Activated Carbon Filter for Ethanol Deodorisation, Find details about China Active Carbon Filter, Stainless Steel Filter from Activated Carbon Filter for Ethanol Deodorisation - JX Filtration (China) Co., Ltd.
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The phase behavior and phase separation kinetics in polymer solutions in binary mixtures of supercritical carbon dioxide (CO2) and organic solvents were studied for two systems. Solutions of polyethylene (PE) in CO2 + n-pentane were selected as one model system to study both the solid-fluid (S-F) and liquid-liquid (L-L) phase transitions as well as the interplay of these two types of phase separations on the final morphological and thermal properties of PE crystals. Solutions of polysulfone (PSF) in CO2 + tetrahydrofuran (THF) were selected as another model system because of the technological importance of this membrane forming polymer and because of the broad interest in developing new solvent/non-solvent systems for forming microporous materials. These phase boundaries were determined using a high-pressure view-cell and optical techniques over a temperature range of 90-165 oC and pressures up to 55 MPa for PE/n-pentane/CO2 system, and over a temperature range of 25 to 155 oC and pressures up ...
Thermal processing of amorphous solid dispersions continues to gain interest in the pharmaceutical industry, as evident by several recently approved commercial products. Still, a number of pharmaceutical polymer carriers exhibit thermal or viscoelastic limitations in thermal processing, especially at smaller scales. Additionally, active pharmaceutical ingredients with high melting points and /or that are thermally labile present their own specific challenges. A number of formulation and process driven strategies to enable thermal processing of challenging compositions have been adopted including the use of traditional plasticizers and surfactants, temporary plasticizers utilizing sub- or supercritical carbon dioxide, designer polymers tailored for hot melt extrusion processing, and KinetiSol® Dispersing technology. The objective of the first study was to compare and contrast two thermal processing methods, HME and KinetiSol® Dispersing (KSD), and investigate the influence of polymer type, ...
Publication Details (including relevant citation information): A.S. Zarena and K. Udaya Sankar. Supercritical carbon dioxide extractin of xanthones
The feasibility of operating with natural circulation as the normal mode of core cooling has been successfully demonstrated for a few small sized nuclear reactors. Natural circulation is being considered for cooling the core of a nuclear reactor under normal operating conditions in several advanced reactor concepts being developed today.. Although studies have been conducted in natural circulation for many decades, using natural circulation as the primary cooling mechanism for nuclear reactors or as a passive safety system requires a comprehensive understanding of local and integral system phenomena, validated benchmark data, accurate predictive tools, and reliability analysis methods. As full-scale experiments of supercritical water are expensive, scaling laws can be applied to develop test matrices using modelling fluids to reproduce similar conditions in a scaled-down experimental thermalhydraulic loop.. The main aim of this work is to understand the natural circulation phenomena by analyzing ...
Highly porous and strong cellulose aerogels were prepared by gelation of cellulose from aqueous alkali hydroxide/urea solution, followed by drying with supercritical CO2. Their morphology, pore structure, and physical properties were characterized by scanning and transmission electron microscopy, X-ray diffraction, nitrogen adsorption measurements, UV/Vis spectrometry, and tensile tests. The cellulose hydrogel was composed of interconnected fibrils of about 20 nm wide. By using supercritical CO2 drying, the network structure in the hydrogel was well preserved in the aerogel. The results are preliminary but demonstrate the ability of this method to give cellulose aerogels of large surface areas (400-500 m2 g−1) which may be useful as adsorbents, heat/sound insulators, filters, catalyst supports, or carbon aerogel precursors. ...
3] The primary extract defined in present claim 7 is characterised both by the production process and by the feature that it contains at least reduced proportions of monoterpene and sesquiterpene hydrocarbons, alkaloids, flavonoids, and chlorophylls. Document D3 […] discloses a supercritical extraction of marihuana that is carried out with CO2 that has a density of 0.9 g/ml at the chosen temperature of 40°C. It has to be noted that under these circumstances the pressure of supercritical CO2 lies within the presently claimed pressure range of between 75 and 500 bar, which means that this feature is implicitly disclosed. Moreover, [the Board] has to agree with the Opposition Division that in the process disclosed in document D3 the individual fractions are quenched (abgefangen) at a subcritical temperature of 25°C. The expression "trapped" used un document D3 implies that the CO2 extract is kept at normal conditions, i.e. room temperature and atmospheric pressure, which means that the CO2 ...
Biopurus is a small supplier of top-notch, certified organic and high-strength CBD drops using CO2 supercritical extraction, which is the gold standard in the industry. Find out why choosing organic CBD oil is so important. Small is beautiful is a proven statement, because, despite its basic packaging and design, this whole-plant extract is of superb, certified organic quality, and one of the best weve tried and tested. Biopurus also produces high-strength drops, following the CO2 supercritical extraction process that is the gold standard in the industry. The highest-quality extract is not only a full-spectrum CBD oil (which contains a full range of cannabinoids) but one that also preserves the raw phytonutrients of the plant: namely, the terpene profile, its bioflavonoids, the chlorophyll and lipids (omega oils). Biopurus believes in preserving the whole-plant organic extract to deliver the full benefits of cannabis oil (without the intoxicating cannabinoid THC ...
The supercritical carbon dioxide extraction (SC-CO2) of fish oil was studied using the viscera and skin of African catfish as a raw material and the CO2 as supercritical fluid solvent. A central composite design of response surface methodology (RSM) was employed to optimize the SC-CO2 extraction variables. The response variable (Y) oil yield was executed against the four independent variables namely pressure, temperature, flow rate and the soaking time. The statistical analysis showed, pressure was the most significant linear factor on oil yield. Furthermore, the oil yield was varied with the interaction effects of pressure, temperature and flow rate. Optimum points were obtained within the studied variables range at 65°C temperature, 35 MPa pressure, 2.6 mL/min flow rate and 3.6 h soaking time with maximum oil yield 66.96 and 40.6% from viscera and skin, respectively. The principal fatty acids in terms of concentration were oleic and docosahexaenoic acids respectively. The main objective of ...
In the process of distillation, large stills, traditionally of copper, are filled with roses and water. The still is fired for 60-105 minutes. The vaporized water and rose oil exit the still and enter a condensing apparatus and are then collected in a flask. This distillation yields a very concentrated oil, direct oil, which makes up about 20% of the final product. The water which condenses along with the oil is drained off and redistilled, cohobation, in order to obtain the water-soluble fractions of the rose oil such as phenethyl alcohol which are a vital component of the aroma and which make up the large bulk, 80%, of the oil. The two oils are combined and make the final rose otto. Rose otto is mobile in room temperature and is usually clear, light yellow in color. It will form white crystals at normal room temperature which disappear when the oil is gently warmed. It will tend to become more viscous at lower temperatures due to this crystallization of some of its components. The essence has ...
The leaves of Rosmarinus officinalis harvested from three different locations of Turkey were extracted by both methanolic and supercritical CO(2) extraction. Subsequently, six extracts and the active compounds, carnosic acid, and rosmarinic acid were applied to various human cancer cell lines including NCI-H82 (human, small cell lung, carcinoma), DU-145 (human, prostate, carcinoma), Hep-3B (human, black, liver, carcinoma, hepatocellular), K-562 (human chronic myeloid leukemia), MCF-7 (human, breast, adenocarcinoma), PC-3 (human, prostate, adenocarcinoma) and MDA-MB-231 (human, breast, adenocarcinoma) by MTT assay. Supercritical CO(2) extracts had superior antiproliferative effect compared to the soxhlet extracts. Although the extracts exhibited various cytotoxic effects against different cell lines, comparatively low IC(50) values ranging between 12.50 and 47.55 microg/ml were attained against K-562, being the most sensitive cell line. Moreover, carnosic acid caused the lowest cell viability ...
Solid State Fermentation (SSF), which consists of the microbial growth and product formation on solid particles in the absence of an aqueous phase, has recently attracted special attention of researchers. The aim of this study was to evaluate the chemical composition and antimicrobial activity of winter savory plant fermented with lactic acid bacteria (LAB) by using SSF. Dried winter savory plant was fermented under SSF conditions for 72 hours using Lactobacillus and Pediococcus genera belonging to isolated LAB from spontaneous Lithuanian rye sourdoughs. The essential oils were extracted using supercritical carbon dioxide and the composition of volatile compounds was analyzed by means of GC-MS. The antimicrobial activity of extracts was tested using an agar well diffusion assay method ...
technology for cellulosic biomass conversion, recently put out a press release announcing the grant of U.S. Patent No. 8,540,847 (847 Patent).. Entitled "Methods and apparatus for processing cellulosic biomass," the 847 Patent is directed to methods and apparatus for making ethanol or other biofuels using what Aphios calls its Aosic process.. The apparatus (11) described and claimed in the patent comprises a first vessel (13) for receiving cellulosic biomass and conveying means (15) in fluid communication with the first vessel (13). The apparatus (11) also comprises supercritical, critical, or near critical fluid means (17), which includes a source of gas, such as gas tank (41), holding carbon dioxide pressurized to form supercritical, critical, or near critical fluid.. The fluid means (17) is in fluid communication with conveying means (15) via conduit (31). A pump (47) is connected to a heat exchanger (55), which controls the temperature of the supercritical, critical, or near critical ...
Petroleum based fuels are considered as main sources of worlds energy including coal, natural gas and petroleum oil fractions. However, due to oil reserves limitation, unstable oil price and extensive emissions of greenhouse gases, which are the main cause of global warming, make the petroleum-based energy unreliable. Consequently, it is essential to find an alternative renewable, green and sustainable source of energy for fossil fuels replacement. Biodiesel has been considered as an important renewable fuel in the worldwide markets, due its economic and environmental benefits. In spite of its lower heating value, biodiesel has its advantages over petroleum based diesel fuel: it is biodegradable and nontoxic, it provides free sulphur and aromatics combustion and it is a greener fuel as it emits lower carbon monoxide and hydrocarbon. Waste cooking oil (WCO) has been recognised as a significant feedstock for biodiesel production. It provides more sustainability for the product since it includes ...
Adrenal tonic, allergies, amenorrhea (absence of menstruation), anemia, antifungal, antipyretic (fever reducer), anti-inflammatory, asthma, autoimmune diseases, blood clotting disorders, cancer pain (bone cancer), cataracts, central nervous system disorders, chemotherapy adverse effects, cognitive processing, coronary heart disease (postmenopausal symptoms), dementia, diabetes mellitus type 2, diuretic, dizziness, dysmenorrhea (painful menstruation), eczema (dry skin), fatigue, fever, gastric adenoma (benign tumor), hair tonic (premature graying), hearing damage (gentamicin-induced), hematopoiesis (stimulation of blood cell production), hematuria (blood in the urine), HIV (medication side effects), hyperlipidemia (high cholesterol), hypertension (high blood pressure), hypotension (low blood pressure), hypoxia (very low oxygen levels, nocturnal), immunosuppression, laxative, liver protection, lumbar disc herniation (intervertebral disc protrusion), lung cancer, lupus nephritis measles, ...
OK for dogs; NOT FOR CATS. Triple Neem Care Ointment 1 oz Often referred to as the Village Pharmacy in India, Neem is respected by Ayurvedic practitioners for its ability to help soothe and support healthy skin. Protects and Soothes; Helps condition skin and lips; Helps nourish dry skin. Directions: Apply to desired area as needed. Ingredients: Sesamum Indicum (Sesame) Oil*, Beeswax*, Azadirachta Indica (Neem) Oil*, Pelargonium Graveolens (Rose Geranium) Oil, Cananga Odorata (Ylang Ylang) Oil , Calendula Officinalis (Calendula) Supercritical Extract*, Tocopherol (Natural Vitamin E), Azadirachta Indica (Neem) Leaf Supercritical Extract*, Azadirachta Indica (Neem) Bark Supercritical Extract*, Terminalia Arjuna (Arjuna) Supercritical Extract*. *Certified Organic Caution: For external use only. Avoid contact with eyes. Keep out of reach of children. If irritation, redness or discomfort occurs, discontinue use and consult a licensed health care practitioner. Store tightly sealed in a cool, dry place ...
Chronic diarrhea of infancy, also called toddlers diarrhea, is a common condition typically affecting children between ages 6-30 months, usually resolving by age 4. Symptoms include multiple loose bowel movements per day, sometimes with undigested food visible; normal growth with no evidence of malnutrition; and no evidence blood in the stool or infection. The condition may be related to irritable bowel syndrome. Before a diagnosis of toddlers diarrhea is made, the following conditions should be ruled out: Celiac sprue (wheat gluten intolerance) Cystic fibrosis Sugar malabsorption Food allergy Treatment is primarily through diet. Dietary fiber and fat can be increased and fluid intake, especially fruit juice intake, decreased. With these considerations, the patient should consume a normal balanced diet to avoid malnutrition or growth restriction. Medications such as loperamide should not be used. Studies have shown that certain probiotic preparations such as Lactobacillus rhamnosus (a ...

United States Supercritical Fluid Chromatography (Sfc) Industry... - QYResearchUnited States Supercritical Fluid Chromatography (Sfc) Industry... - QYResearch

Japan Supercritical Fluid Chromatography (Sfc) Industry Market Research Report 2017. India Supercritical Fluid Chromatography ( ... Global Supercritical Fluid Chromatography (Sfc) Industry Market Research Report 2017. China Supercritical Fluid Chromatography ... United States Supercritical Fluid Chromatography (Sfc) Industry Market Research Report 2017. News • Feb 27, 2017 01:54 GMT ... The United States Supercritical Fluid Chromatography (Sfc) Industry Market Research Report 2017 is a professional and in-depth ...
more infohttp://www.mynewsdesk.com/qyresearch/news/united-states-supercritical-fluid-chromatography-sfc-industry-market-research-report-2017-223274

United States Supercritical Fluid Chromatography (Sfc) Market Report 2017 : ReportsnReportsUnited States Supercritical Fluid Chromatography (Sfc) Market Report 2017 : ReportsnReports

In this report, the United States Supercritical Fluid Chromatography (Sfc)... ... 98 Pages Report] Check for Discount on United States Supercritical Fluid Chromatography (Sfc) Market Report 2017 report by ... 1 Supercritical Fluid Chromatography (Sfc) Overview. 1.1 Product Overview and Scope of Supercritical Fluid Chromatography (Sfc) ... 7 Supercritical Fluid Chromatography (Sfc) Manufacturing Cost Analysis. 7.1 Supercritical Fluid Chromatography (Sfc) Key Raw ...
more infohttp://www.reportsnreports.com/reports/848563-united-states-supercritical-fluid-chromatography-sfc-market-report-2017.html

Separation of Coenzyme Q10 in Palm Oil by Supercritical Fluid Chromatography | Science PublicationsSeparation of Coenzyme Q10 in Palm Oil by Supercritical Fluid Chromatography | Science Publications

Separation of coenzyme Q10 in CPO and palm fibre oil was carried out using supercritical fluid chromatography with ultra violet ... Separation of Coenzyme Q10 in Palm Oil by Supercritical Fluid Chromatography Ng M. Han, Choo Y. May, Ma A. Ngan, Chuah C. Hock ... Separation of coenzyme Q10 in CPO and palm fibre oil was carried out using supercritical fluid chromatography with ultra violet ...
more infohttp://thescipub.com/abstract/10.3844/ajassp.2006.1929.1932

Review: Isomer Separation, Chiral Resolution, and Structure Elucidation Analyses Are the Future of Analytical Supercritical...Review: Isomer Separation, Chiral Resolution, and Structure Elucidation Analyses Are the Future of Analytical Supercritical...

Supercritical Fluid Chromatography (SFC) received an uneasy welcome, mainly because of the lack of commercially available ... the application to chromatography of the critical phenomena of compressed gases or overheated liquids as supercritical fluids ... Extraction with supercritical fluids (SFs) was welcome from the very beginning. In the present paper, ... High-Performance Liquid Chromatography or even Thin Layer Chromatography. The present status and future perspectives for SFC ...
more infohttps://www.scirp.org/journal/paperinformation.aspx?paperid=44573

Comprehensive and off-line supercritical fluid chromatography: reversed phase liquid chromatography for the analysis of complex...Comprehensive and off-line supercritical fluid chromatography: reversed phase liquid chromatography for the analysis of complex...

Comprehensive and off-line supercritical fluid chromatography: reversed phase liquid chromatography for the analysis of complex ... "Comprehensive and Off-line Supercritical Fluid Chromatography: Reversed Phase Liquid Chromatography for the Analysis of Complex ... "Comprehensive and Off-line Supercritical Fluid Chromatography: Reversed Phase Liquid Chromatography for the Analysis of Complex ... Comprehensive and off-line supercritical fluid chromatography: reversed phase liquid chromatography for the analysis of complex ...
more infohttps://biblio.ugent.be/publication/816990

Supercritical Fluid Chromatography | NorlabSupercritical Fluid Chromatography | Norlab

Sepiatec preparative Supercritical Fluid Chromatography (SFC) technology. Sepiatec designs compact and very easy to use ... Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC ... Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC ... In this application, Jasco applied Supercritical Fluid Chromatography (SFC) coupled with CAD to an analysis of biodiesel fuel. ...
more infohttp://norlab.com/infocenter/192

Supercritical Fluid Chromatography | NorlabSupercritical Fluid Chromatography | Norlab

Sepiatec preparative Supercritical Fluid Chromatography (SFC) technology. Sepiatec designs compact and very easy to use ... Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC ... Preparative Supercritical Fluid Chromatography (pSFC). As an environment-friendly approach to purification applications, pSFC ... In this application, Jasco applied Supercritical Fluid Chromatography (SFC) coupled with CAD to an analysis of biodiesel fuel. ...
more infohttp://norlab.fi/infocenter/192

European Super Critical Fluid Chromatography Reagents Market is Expected to Reach $75.4 million in 2018 - New Report by...European Super Critical Fluid Chromatography Reagents Market is Expected to Reach $75.4 million in 2018 - New Report by...

The European Supercritical fluid chromatography reagents report defines and segments the concerned market in Europe with ... In super critical fluid chromatography, a supercritical fluid is used as the mobile phase. A super critical fluid is a ... North America Super Critical Fluid Chromatography (Reagents) Market Super Critical Fluid Chromatography Reagents-North America ... Europe is the second-largest market for supercritical fluid chromatography reagents. The demand for the supercritical fluid ...
more infohttp://www.prweb.com/releases/super-critical/market/prweb12154982.htm

Effects of organic modifier and temperature on the enantiomeric separation of several azole drugs using supercritical fluid...Effects of organic modifier and temperature on the enantiomeric separation of several azole drugs using supercritical fluid...

... using supercritical fluid chromatography with the Chiralpak AD column, have been investigated in this work. For this purpose ... Supercritical fluid chromatography for the enantioseparation of pharmaceuticals.. *Katrijn De Klerck, Debby Mangelings, Yvan ... Supercritical fluid chromatography for analysis and purification in drug discovery.. *Mohamed Maftouh, Christine Granier-Loyaux ... Overview of the Analytical Lifecycle of Supercritical Fluid Chromatography Methods. *Bertyl Andri, Amandine Dispas, Roland ...
more infohttps://www.semanticscholar.org/paper/Effects-of-organic-modifier-and-temperature-on-the-Toribio-Bernal/e2531f7aa43153deef9b8225af47bb8d99e889db

Supercritical Fluid Generated Stationary Phases for Liquid Chromatography and Capillary ElectrochromatographySupercritical Fluid Generated Stationary Phases for Liquid Chromatography and Capillary Electrochromatography

Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
more infohttps://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ac034511q

Simultaneous quantitative analysis of glucosylceramide and galactosylceramide species by supercritical fluid chromatography...Simultaneous quantitative analysis of glucosylceramide and galactosylceramide species by supercritical fluid chromatography...

While supercritical fluid chromatography (SFC) has been available for decades, very few labs have chosen to take advantage of ... Simultaneous quantitative analysis of glucosylceramide and galactosylceramide species by supercritical fluid chromatography ... Simultaneous quantitative analysis of glucosylceramide and galactosylceramide species by supercritical fluid chromatography ... Post a Comment for Simultaneous quantitative analysis of glucosylceramide and galactosylceramide species by supercritical fluid ...
more infohttp://digital.library.musc.edu/cdm/singleitem/collection/medica/id/741/rec/14

Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange...Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange...

Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange ... Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange ... Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium exchange ... title = "Supercritical fluid chromatography reduction of hydrogen/deuterium back exchange in solution-phase hydrogen/deuterium ...
more infohttps://researchexperts.utmb.edu/en/publications/supercritical-fluid-chromatography-reduction-of-hydrogendeuterium

Equipment | NSERC CREATE in Green Chemistry - McGill UniversityEquipment | NSERC CREATE in Green Chemistry - McGill University

REACT IR Several LC-MS Several GC-MS Several flash chromatography separation systems NMR facility Mass spectrometry facility ... Surpercritical CO2 reactor Surpercritical CO2 extractor Surpercritical CO2 phase monitor Investigator Supercritical fluid ... Chromatography System A series of high pressure reactors (Endeavour, HEL, Parr, Autoclave Engineers) ... Investigator Supercritical fluid Chromatography System. A series of high pressure reactors (Endeavour, HEL, Parr, Autoclave ...
more infohttp://www.mcgill.ca/green-chemistry-create/research/equipment

ASTM International - Standard References for ASTM D5186 - 19ASTM International - Standard References for ASTM D5186 - 19

D7347 Standard Test Method for Determination of Olefin Content in Denatured Ethanol by Supercritical Fluid Chromatography ... D6550 Standard Test Method for Determination of Olefin Content of Gasolines by Supercritical-Fluid Chromatography ... Determination of the Aromatic Content and Polynuclear Aromatic Content of Diesel Fuels By Supercritical Fluid Chromatography. ... D6591 Test Method for Determination of Aromatic Hydrocarbon Types in Middle DistillatesHigh Performance Liquid Chromatography ...
more infohttps://www.astm.org/DATABASE.CART/STD_REFERENCE/D5186.htm

Advances in Mass Spectrometry for the Analysis of Emerging Persistent Organic PollutantsAdvances in Mass Spectrometry for the Analysis of Emerging Persistent Organic Pollutants

Mass Spectrometry, Liquid Chromatography, Supercritical Fluid Chromatography, Ion Mobility, POPs, Electrospray Ionization ... hexabromocyclododecane, enantiomeric separation, supercritical fluid chromatography National Category Analytical Chemistry ... were implemented through the development of two supercritical fluid chromatography (SFC) methods. Based on the inherent ... were separated and isolated for the first time using enantioselective packed column supercritical fluid chromatography (pSFC) ...
more infohttp://oru.diva-portal.org/smash/record.jsf?pid=diva2%3A1350194&c=7&language=en&searchType=LIST_COMING&query=&af=%5B%5D&aq=%5B%5B%5D%5D&aq2=%5B%5B%5D%5D&aqe=%5B%5D&noOfRows=50&sortOrder=author_sort_asc&sortOrder2=title_sort_asc&onlyFullText=false&sf=all

IDEALS @ Illinois: The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheeseIDEALS @ Illinois: The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese

... fluid extraction to isolate the FFA and subsequently separate and quantitate the FFA with supercritical fluid chromatography. ... The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese. Welcome to the IDEALS Repository ... The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese. Mohyuddin, Ghulam ... The supercritical fluid extraction and chromatographic analysis of fatty acids in blue cheese. ...
more infohttps://www.ideals.illinois.edu/handle/2142/19000

Analysis of hexafluoropropylene oxide-dimer acid (HFPO-DA) by liquid chromatography-mass spectrometry (LC-MS) : Review of...Analysis of hexafluoropropylene oxide-dimer acid (HFPO-DA) by liquid chromatography-mass spectrometry (LC-MS) : Review of...

Mass Spectrometry, Liquid Chromatography, Supercritical Fluid Chromatography, Ion Mobility, POPs, Electrospray Ionization ... were implemented through the development of two supercritical fluid chromatography (SFC) methods. Based on the inherent ... to assist specific analytical challenges including separation of stereoisomers using supercritical fluid chromatography (SFC), ... qualities of supercritical fluids, separation of both predominant diastereomers and respective enantiomers was performed in a ...
more infohttp://oru.diva-portal.org/smash/record.jsf?pid=diva2%3A1356737

bims-metlip 2019-12-08 papersbims-metlip 2019-12-08 papers

Ion exchange in supercritical fluid chromatography tandem mass spectrometry (SFC-MS/MS): Application for polar and ionic drugs ... Ion exchange in supercritical fluid chromatography tandem mass spectrometry (SFC-MS/MS): Application for polar and ionic drugs ... Supercritical fluid chromatography (SFC) is an orthogonal technique to UHPLC. In recent years, SFC has demonstrated potential ... Ultra-high Performance Supercritical Fluid Chromatography Combined with Quadrupole Time-of-Flight Mass Spectrometry for the ...
more infohttp://biomed.news/bims-metlip/2019-12-08

Arajendrancvcomplete.dviArajendrancvcomplete.dvi

Pressure drop effects in supercritical fluid chromatography, 1st International Conference on Supercritical Fluid Chromatography ... Optimization of binary separations in supercritical fluid chromatography, 1st International Conference on Supercritical Fluid ... Chiral separation of flurbiprofen by supercritical fluid chro- matography, 1st International Conference on Supercritical Fluid ... Analysis of supercritical fluid chromatography, Inter- national Symposium on Preparative and Industrial Chromatography and ...
more infohttp://pharmapdf.com/a/acm.njust.edu.cn1.html

Packed capillary columns in gas chromatography - a review, and a study on silica-based particlesPacked capillary columns in gas chromatography - a review, and a study on silica-based particles

... for both supercritical fluid chromatography (SFC) and high performance liquid chromatography (HPLC). In the present work, the ... Packed capillary columns in gas chromatography - a review, and a study on silica-based particles. Stepaschko, Jacob A. ... A review on the use of packed capillary columns in gas chromatography (GC) is presented. Several articles on the invention of ... A recently developed technique, solvating gas chromatography (SGC), which uses CO2 as the mobile phase combined with a high ...
more infohttps://www.duo.uio.no/handle/10852/12738

The thermodynamics of (carbon dioxide + methanol) mixtures from 25C to 250C and at pressures up to 20 MPa  - Memorial...The thermodynamics of (carbon dioxide + methanol) mixtures from 25C to 250C and at pressures up to 20 MPa - Memorial...

... particularly in systems used in supercritical fluid chromatography (SFC) and supercritical fluid extraction (SFE). For both of ... There are many experimental issues associated with supercritical fluids, and laboratory equipment must be specially designed to ... This has stimulated studies of the phase behaviour and thermodynamic properties of supercritical fluid mixtures, ... The (CO: + MeOH) system is of interest to applied research on fluid properties because the pure liquids have widely differing ...
more infohttp://research.library.mun.ca/1555/

Supercritical Carbon dioxide Treatment of the Microalgae Nannochlorops by Janet McKennedy, Sermin Onenc et al."Supercritical Carbon dioxide Treatment of the Microalgae Nannochlorops" by Janet McKennedy, Sermin Onenc et al.

A qualitative gas chromatography (GC) analysis showed that the individual FAMEs extracted varied depending on the co-solvent ( ... methanol or hexane) used with supercritical CO2. Using hexane, FAME compounds produced were similar to those extracted with ... The aim of this work was to evaluate the potential of supercritical carbon dioxide (CO2) to extract Fatty Acid Methyl Esters ( ... of Supercritical Fluids,doi:10.1016/j.supflu.2016.06.003 ... A qualitative gas chromatography (GC) analysis showed that the ...
more infohttps://arrow.tudublin.ie/engschcivart/107/

Supercritical fluid chromatography - WikipediaSupercritical fluid chromatography - Wikipedia

Supercritical fluid chromatography (SFC) is a form of normal phase chromatography that uses a supercritical fluid such as ... Taylor, Larry T. (2009). "Supercritical fluid chromatography for the 21st century". The Journal of Supercritical Fluids. 47 (3 ... "Integration of supercritical fluid chromatography into drug discovery as a routine support tool". Journal of Chromatography A. ... supercritical fluid chromatography is sometimes called convergence chromatography. SFC is used in industry primarily for ...
more infohttps://en.wikipedia.org/wiki/Supercritical_fluid_chromatography
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