The development of automatized hyphenated systems is attractive to avoid sampling error, save time and reduce costs. Among these systems, on-line SFE-SFC allows the extraction, separation, detection molecules in an efficient, quick eco-friendly way. After a historical introduction explanation on use supercritical fluids for extraction or analysis, principles fluid (SFE) chromatography (SFC) wil...

This work was aimed to extract and characterise the essential oils presented in the leaves of Moringa Oleifera using supercritical fluid extraction (SFE) and compare the results against those using the conventional Soxhlet extraction method. The oils extracted were analysed using GC-MS. The compounds were identified according to their retention indices and mass spectra (EI, 70eV). The effects o...

Alpinia officinarum has been confirmed to possess bioactivities against some pests. In this work, a sample was obtained from A. officinarum rhizomes by supercritical fluid CO₂ extraction (SFE). According to GC-MS analysis, the main chemical components for SFE-sample included benzylacetone (26.77%), 1,7-diphenyl-5-hydroxy-3-heptanone (17.78%), guaiacylacetone (10.03%) and benzenepropanal (7.42%)...

Supercritical fluid extraction (SFE) is emerging as a valuable analytical technique for use as an alternative to conventional solid-phase (SPE) and liquid-liquid extraction techniques. It is a relatively new technique based on the use of supercritical fluids for the isolation of analytes from various matrices and is attracting great interest because of the increasing need for a simple, rapid, e...

Este articulo revisa el presente y el uso futuro de la extracci6n con fluidos supercriticos (SFE), principalmente dibxido de carbono (CO*) benign0 para el ambiente. La extracci6n con fluidos supercriticos se desarroll6 coma aplicaci6n analitica a mediados de 10s arios 80 coma respuesta al deseo de reducir el uso de disolventes organicos en el ambiente del laboratorio, y se est6 convirtiendo en ...

We investigate the impact of the star formation efficiency in cluster-forming-cores (i.e. local SFE) on the evolution of the mass in star clusters over the age range 1-100Myr, when star clusters undergo their infant weight-loss/mortality phase. Our model builds on the N -body simulation grid of Baumgardt & Kroupa (2007). Assuming a constant formation rate of gas-embedded clusters and a weak tid...

Identifikácia organických látok v slovenskom hnedom uhlí Vzorky slovenského hnedého uhlia z lokality Cígeľ a Handlová boli podrobené nadkritickej fluidnej extrakcii (SFE) oxidom uhličitým, modifikovaným 5 % metanolom. Extrakty, získané metódou SFE, boli podrobené plynovej chromatografii s hmotnostno-spektrometrickou identifikáciou (GC MS). Porovnaním s literárnymi údajmi hmotnostnej spektroskop...

We measure the star formation efficiency (SFE), the star formation rate per unit gas, in 23 nearby galaxies and compare it to expectations from proposed star formation laws and thresholds. We use H I maps from THINGS and derive H2 maps from CO measured by HERACLES and BIMA SONG. We estimate the star formation rate by combining GALEX FUV maps and SINGS 24μm maps, infer stellar surface density pr...

Background: The purpose of this study was to investigate the effect of etching time using 9% hydrofluoric acid on Fracture Load (FL) and surface properties, such as Surface Free Energy (SFE) and Surface Roughness (SR) of three CAD/CAM glass-ceramics. Methods: Following glass-ceramics were investigated: EMP (IPS Empress CAD), KLE (KLEMA CAD/CAM glass-ceramic) and EMC (IPS e.max CAD). For FL, sta...

Iron is an important constituent of kornerupine, (M,Mg,Fe)(Al,Mg,Fe)9(Si,Al,B)5O21(OH,F). We obtained Mössbauer spectra at 300 K on twelve samples with SFe 5 0.30–1.30 atoms per formula unit (apfu) and Fe31/SFe 5 0–0.31; several samples were also run at 77 and 430 K. Models allowing unequivocal refinement of the spectra and determination of site occupancies were developed only when single-cryst...