Search Results - "Levsen, K"

Structure elucidation of phase II metabolites by tandem mass spectrometry: an overview by Levsen, Karsten, Schiebel, Hans-Martin, Behnke, Beate, Dötzer, Reinhard, Dreher, Wolfgang, Elend, Manfred, Thiele, Herbert

“…The present paper provides a summary of the collision-induced dissociation of protonated and deprotonated phase II metabolites of drugs and pesticides. This…”
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Development of a gas chromatography–mass spectrometry method for the determination of household insecticides in indoor air by Elflein, L, Berger-Preiss, E, Levsen, K, Wünsch, G

“…This work presents a GC–MS method for the determination of 17 household insecticides and acaricides in indoor air. Air samples were collected with a sampling…”
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Engine dynamometer experiments: platinum emissions from differently aged three-way catalytic converters by Artelt, S., Kock, H., König, H.P., Levsen, K., Rosner, G.

“…Depending on the operating conditions and the age of the converter, mean platinum emissions ranged from 7 to 123 ng m -3 corresponding to emission factors…”
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Metabolism of verapamil: 24 new phase I and phase II metabolites identified in cell cultures of rat hepatocytes by liquid chromatography–tandem mass spectrometry by Walles, M, Thum, T, Levsen, K, Borlak, J

“…Verapamil is a widely prescribed calcium antagonist, but suffers from extensive first pass metabolism. Despite its frequent use in drug metabolism a complete…”
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Pesticides in rain by Hüskes, R., Levsen, K.

“…40 rainwater samples were collected in Hannover and near Peine (Lower Saxony, Germany) in 1992 using a wet-only collector. The samples were extracted by solid…”
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Human biomonitoring of pyrethrum and pyrethroid insecticides used indoors:: Determination of the metabolites E- cis/ trans-chrysanthemumdicarboxylic acid in human urine by gas chromatography-mass spectrometry with negative chemical ionization by Elflein, L, Berger-Preiss, E, Preiss, A, Elend, M, Levsen, K, Wünsch, G

“…This work describes a gas chromatographic-mass spectrometric method employing negative chemical ionization (NCI) for the determination of E- cis/…”
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Comparative studies of the leachate of an industrial landfill by gas chromatography–mass spectrometry, liquid chromatography–nuclear magnetic resonance and liquid chromatography–mass spectrometry by Benfenati, E, Pierucci, P, Fanelli, R, Preiss, A, Godejohann, M, Astratov, M, Levsen, K, Barceló, D

“…Nowadays, the need to have a realistic characterization of industrial effluents in the environment has become more and more recognized. A palette of different…”
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Aromatic hydrocarbons in the atmospheric environment. Part III: personal monitoring by Ilgen, E., Levsen, K., Angerer, J., Schneider, P., Heinrich, J., Wichmann, H.-E.

“…As part of a larger study, personal sampling of the aromatic hydrocarbons benzene, toluene, ethylbenzene and the isomeric xylenes (BTEX) was carried out by 55…”
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Verapamil: identification of novel metabolites in cultures of primary human hepatocytes and human urine by LC-MS(n) and LC-NMR by Borlak, J, Walles, M, Elend, M, Thum, T, Preiss, A, Levsen, K

“…1. Verapamil is a well-known and world-wide prescribed calcium antagonist, but it suffers from extensive first-pass metabolism. Although it has been marketed…”
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An Automatic Analyzer for Organic Compounds in Water Based on Solid-Phase Microextraction Coupled to Gas Chromatography by Grote, C, Levsen, K, Wünsch, G

“…An automated system for quasi-continuous and on-site monitoring of organic compounds in water is presented. It is based on solid-phase microextraction (SPME)…”
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Two new asterosaponins from the starfish Asterias rubens: application of a cryogenic NMR probe head by Sandvoss, M., Preiss, A., Levsen, K., Weisemann, R., Spraul, M.

“…We report two new asterosaponins from the Baltic starfish Asterias rubens along with their 1H and 13C NMR data. The compounds were isolated after on‐flow…”
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Verapamil drug metabolism studies by automated in-tube solid phase microextraction by Walles, M, Mullett, W.M, Levsen, K, Borlak, J, Wünsch, G, Pawliszyn, J

“…Verapamil is a common calcium antagonist described with antianginal, antihypertensive and antiarrythmic properties. The metabolites of verapamil have also…”
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Human biomonitoring of pyrethrum and pyrethroid insecticides used indoors by Elflein, L, Berger-Preiss, E, Preiss, A, Elend, M, Levsen, K, Wünsch, G

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Gas chromatographic and mass spectrometric determination of nitroaromatics in water by Feltes, J, Levsen, K, Volmer, D, Spiekermann, M

“…Several methods for the extraction of nitroaromatic compounds from water were compared. High recoveries were achieved with discontinuous or continuous…”
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Determination of nitrophenols, nitrobenzoic acids and polar explosives by HPLC-diode array detection in ground water samples of former ammunition plants by GODEJOHANN, M, PREISS, A, LEVSEN, K, WÜNSCH, G

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Platinum solubility of a substance designed as a model for emissions of automobile catalytic converters by Nachtigall, D, Kock, H, Artelt, S, Levsen, K, Wünsch, G, Rühle, T, Schlögl, R

“…Automobile catalytic converters emit nanocrystalline platinum attached to alumina particles. For investigations about the bioavailability of Pt from these…”
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Gas-chromatographic determination of phenols in aqueous samples after solid phase extraction by Mu mann, P., Levsen, K., Radeck, W.

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Multiresidue analysis of polar pesticides in surface and drinking water by on-line enrichment and thermospray LC-MS by Sennert, S., Volmer, D., Levsen, K., W nsch, G.

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Collection, Validation and Generation of Bitumen Fumes for Inhalation Studies in Rats Part 2: Collection of Bitumen Fumes from Storage Tanks by POHLMANN, G., PREISS, A., LEVSEN, K., RAABE, M., KOCH, W.

“…Objectives: The objective of the study described in this and an accompanying series of papers was to develop a laboratory generated exposure atmosphere to be…”
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Determination of dialkyldimethylammonium compounds and other cationic surfactants in sewage water and activated sludge by Levsen, K., Emmrich, M., Behnert, S.

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