Results 251 to 260 of about 899,512 (307)

Carbon nanotubes: Solid-phase extraction

Journal of Chromatography A, 2010
Since the first report in 1991, carbon nanotubes (CNTs) have shown great possibilities for a wide variety of processes and applications, which include their use as electrodes, sensors (gas, enzymatic, etc.), nanoprobes, electronic materials, field emitters, etc. The combination of structures, dimensions and topologies has provided physical and chemical
Lidia M, Ravelo-Pérez, Antonio V, Herrera-Herrera, Javier, Hernández-Borges, Miguel Angel, Rodríguez-Delgado   +3 more
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Solid-Phase Extraction

2000
Introduction to Solid-Phase Extraction, N.J.K. Simpson and M.J.M. Wells SPE Sorbents and Formats, J.J. Pesek and M.T. Matyska The Sample Matrix and Its Influence on Method Development, N.J. K. Simpson and P.M. Wynne Handling Large Volume Samples: Applications of SPE to Environmental Matrices, M.J.M.
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Immuno-affinity solid-phase extraction

Journal of Chromatography B: Biomedical Sciences and Applications, 2000
The measurement of trace organics such as drugs and pesticides at low concentration in biological and environmental samples is a challenging analytical task. Despite recent advances in instrumentation most analysts regard sample preparation as the rate-limiting step in the overall analytical method.
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Ion-pair solid-phase extraction

Journal of Chromatography A, 2000
Solid-phase extraction (SPE) is a technique widely employed by analytical chemists. SPE cartridges are available in a wide variety of formats containing media with diverse chemistries. This paper will review ion-pair SPE, one of the less frequently applied, and presumably less well-known techniques.
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Magnetic solid-phase extraction

Journal of Magnetism and Magnetic Materials, 1999
Magnetic solid-phase extraction is a new procedure for the preconcentration of target analytes from large volumes based on the use of magnetic or magnetizable adsorbents. In the experiments reactive copper phthalocyanine dye attached to silanized magnetite, and magnetic charcoal were used as adsorbents and selected organic dyes were used as analytes ...
Mirka Šafařı́ková, Ivo Šafařı́k
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Solid Phase Extraction Troubleshooting

2004
Extraction problems that can arise with solid phase extraction are not unlike those that occur with any type of chemical extraction process, including recovery and contamination problems. Since SPE usually requires columnar flow processes, liquid flow problems are possible and more unique to this methodology.
Michael J. Telepchak, Thomas F. August, Glynn Chaney   +2 more
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Solid-phase extraction in clinical biochemistry

Annals of Clinical Biochemistry: International Journal of Laboratory Medicine, 2002
In order to measure low concentrations of analytes in plasma and urine, it is often necessary to extract and concentrate them. With solid-phase extraction (SPE), this is achieved by partitioning the analytes between a solid and a liquid or headspace vapour.
Walker, Valerie, Mills, Graham A.
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Solvent-assisted dispersive solid phase extraction

Talanta, 2013
In this research, a novel extraction technique termed solvent-assisted dispersive solid phase extraction (SADSPE) was developed for the first time. The new method was based on the dispersion of the sorbent into the sample to maximize the contact surface.
Mohammad Reza, Jamali, Ahmad, Firouzjah, Reyhaneh, Rahnama   +2 more
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Solid-Phase Extraction in Malondialdehyde Analysis

Analytical Biochemistry, 1997
Malondialdehyde (MDA) has been widely used as an index of lipoperoxidation in biological and medical sciences as well as in the food industry. A solid-phase extraction (SPE) of the condensation product of the MDA with 2-thiobarbituric acid (TBA) was developed using LiChrolut C18ec, 200 mg (Merck, Darmstadt, Germany), as a SPE cartridge and methanol as ...
J, Suttnar, J, Cermák, J E, Dyr
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Solid-phase extraction of acidic herbicides

Journal of Chromatography A, 2000
A discussion of solid-phase extraction method development for acidic herbicides is presented that reviews sample matrix modification, extraction sorbent selection, derivatization procedures for gas chromatographic analysis, and clean-up procedures for high-performance liquid chromatographic analysis.
M J, Wells, L Z, Yu
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