Results 161 to 170 of about 265,204 (216)

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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Solid-Phase Extraction in Segmented Flow

Langmuir, 2014
Two-phase flow systems are increasingly popular for miniaturized, high-throughput performance of analytical or chemical reactions. In this contribution, we extend a previously described method that allows to increase the range of applications of heterogeneous reactions in two-phase flow, i.e., reactions that rely on isolation and purification of the ...
Rendl, Martin, Brandstetter, Thomas, Rühe, Jürgen   +2 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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Solid-phase extraction of soy isoflavones

Journal of Chromatography A, 2005
An automated method using solid-phase extraction (SPE) for the concentration and clean-up of soy isoflavone extracts is proposed in this work. Using a standardized sample (0.1 g of a freeze dried soybean extract/25 mL of water); eight SPE cartridges with a wide range of sorbents (C18, divinylbenzene and modified divinylbenzene) from different suppliers
Mauricio A, Rostagno, Miguel, Palma, Carmelo G, Barroso   +2 more
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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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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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MOLECULAR IMPRINTS FOR SOLID-PHASE EXTRACTION

2000
Among the most important fields in analytical chemistry are medical, food and environmental analysis, where the target analytes are often present at very low concentrations in rather complex matrices. Methods currently used for analysis, such as liquid chromatography, gas, chromatography or capillary electrophoresis, must therefore be proceeded by a ...
Cormack, Peter, Haupt, Karsten
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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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A magnetizable solid phase for enzyme extraction

Applied Biochemistry and Biotechnology, 1991
A method for the convenient and reliable preparation of magnetizable agarose beads containing iron particles is described. The beads were treated with the triazine dye, Reactive Red 120, and the matrix was examined for the ability to extract proteins from crude preparations using lactate dehydrogenase from porcine muscle as a model.
M P, Ennis, G B, Wisdom
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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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