TY - CONF A1 - Retter, Utz A1 - Koch, Matthias A1 - Nehls, Irene T1 - Rückgewinnung von Mineralölen durch Salzbrechung von Öl-Wasser-Emulsionen T2 - Veranstaltung der SEPAWA CY - Berlin, BAM, Deutschland DA - 2000-09-08 PY - 2000 AN - OPUS4-956 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dorgerloh, Ute A1 - Becker, Roland A1 - Nehls, Irene T1 - Ringversuche: Präparation mineralölkohlenwasserstoffhaltiger Abwasserproben KW - Analytik KW - Ringversuch KW - Abwasser KW - Mineralölkohlenwasserstoff KW - Probe KW - Qualitätssicherung KW - Chemical analysis KW - Interlaboratory comparison KW - Wastewater KW - Mineral oil KW - Sample KW - Quality assurance PY - 2008 SN - 0083-6915 VL - 106 IS - 3 SP - 7 EP - 8 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-18289 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dorgerloh, Ute A1 - Erhardt, Ulla A1 - Schmieder, Rosmarie A1 - Walter, W. A1 - Win, Tin A1 - Hilbert, S. A1 - Mechler, M. A1 - Nehls, Irene T1 - Ringversuch zur Bestimmung von leichtflüchtigen halogenierten Kohlenwasserstoffen (LHKW), Vinylchlorid (VC) und Fluorchlorkohlenwasserstoffen (FCKW) in Grundwasser KW - Analytik KW - Grundwasser KW - Leichtflüchtige halogenierte Kohlenwasserstoffe (LHKW) KW - Vinylchlorid (VC) KW - Fluorchlorkohlenwasserstoffe (FCKW) KW - Ringversuch KW - Analytics KW - Groundwater KW - Highly volatile halogenated hydrocarbons (VHHC) KW - Vinyl chloride (VC) KW - Chlorofluorocarbons (CFC) KW - Interlaboratory comparison PY - 2004 SN - 0083-6915 VL - 102 IS - 2 SP - 12 EP - 16 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-4126 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Krüger, Rita A1 - Koch, Matthias A1 - Nehls, Irene T1 - Ringversuch für Acrylamid, Theobromin und Coffein in Kakao KW - Ringversuch KW - Acrylamid KW - Theobromin KW - Coffein KW - Kakao PY - 2008 SN - 0937-1478 SN - 1521-3811 VL - 62 IS - 4 SP - 110 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-17848 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Ressortforschung und Analytische Chemie - Möglichkeiten und Grenzen T2 - Eingeladener Vortrag im GKSS Institut für Chemie in Teltow-Seehof CY - Teltow, Germany DA - 2005-02-18 PY - 2005 AN - OPUS4-7519 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Philipp, B. A1 - Wagenknecht, W. A1 - Nehls, Irene A1 - Klemm, D. A1 - Stein, A. A1 - Heinze, Th. T1 - Regioselective derivatization of cellulose-routes of synthesis, effects on properties and areas of application KW - Zellulose KW - Routing KW - Regioselektivität PY - 1996 SN - 0032-3918 SN - 0370-050X VL - 21 SP - 115 EP - 161 PB - Gordon and Breach CY - New York, NY AN - OPUS4-701 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Becker, Roland A1 - Nehls, Irene A1 - Buge, Hans-Gerhard T1 - Referenzmaterialien für Umweltanalysen PY - 2001 SN - 0016-3538 IS - 45 SP - 1089 EP - 1091 PB - GIT-Verlag CY - Darmstadt AN - OPUS4-1186 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Koch, Matthias A1 - Krüger, Rita A1 - Nehls, Irene T1 - Referenzmaterialien für Ochratoxin A in Kaffee und Wein KW - Ochratoxin A KW - Referenzmaterial KW - ERM KW - Kaffee KW - Wein PY - 2007 SN - 0937-1478 SN - 1521-3811 VL - 61 IS - 4 SP - 102 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-15723 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Referenzmaterialien - Instrumente der Qualitätssicherung T2 - Kolloquiumsvortrag auf Einladung der Abt. F+E-Analytic der SKW Stickstoffwerke Piesteritz CY - Lutherstadt Wittenberg, Germany DA - 2002-09-26 PY - 2002 AN - OPUS4-5838 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nehls, Irene T1 - Referenzmaterialien - Instrumente der Qualitätssicherung PY - 2005 DO - https://doi.org/10.1002/nadc.20050530924 SN - 1439-9598 SN - 1521-3854 VL - 53 SP - 925 EP - 927 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-10844 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Referenzmaterialien - Instrumente der Qualitätssicherung T2 - Kolloquium im Fachbereich Chemie der Humboldt-Universität Berlin CY - Berlin, Germany DA - 2005-02-24 PY - 2005 AN - OPUS4-11738 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Becker, Roland A1 - Win, Tin A1 - Buge, Hans-Gerhard A1 - Koch, Matthias T1 - Referenzmaterialien - Instrimente der Qualitätssicherung T2 - Kolloquium im Fachbereich Chemie der Humboldt-Universität Berlin auf Einladung von Herrn Prof. Linscheid CY - Berlin, Germany DA - 2004-02-24 PY - 2004 AN - OPUS4-5471 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Referenzmaterialien - Basis der internen und externen Qualitätssicherung T2 - Seminar: Referenzmaterialien, Regelkarten, Ringversuche; Klinker & Partner GmbH CY - Saarbrücken, Germany DA - 1999-12-01 PY - 1999 AN - OPUS4-5717 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Referenzmaterialien T2 - 4. EUROLAB/D-Kolloquium Bundesanstalt für Materialforschung und /-Prüfung CY - Berlin, Germany DA - 1998-03-27 PY - 1998 AN - OPUS4-5696 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Nehls, Irene A1 - Win, Tin ED - Zschunke, Adolf T1 - Reference Materials in Environmental Studies KW - Reference Materials KW - Analytical Chemistry KW - Calibration KW - Method Validation KW - Traceability PY - 2000 SN - 3-540-66776-8 SN - 0933-033X N1 - Serientitel: Springer Series in materials science – Series title: Springer Series in materials science IS - 40 SP - 143 EP - 165 PB - Springer CY - Berlin AN - OPUS4-1013 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene T1 - Reference materials for organic environmental analysis T2 - BERM-7 CY - Antwerp, Belgium DA - 1997-04-21 PY - 1997 AN - OPUS4-5671 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Köppen, Robert A1 - Koch, Matthias A1 - Emmerling, Franziska A1 - Nehls, Irene T1 - rac-(1R,2R,4S)-1,2-Dibromo-4-[(1R)-1,2-dibromoethyl]cyclohexane N2 - In the title compound, C8H12Br4, the cyclohexane ring exhibits a chair conformation. The C-Br distances range from 1.964 (6) to 1.985 (5) Å and the C-C distances range from 1.496 (6) to 1.543 (7) Å. Short intermolecular BrBr contacts [3.467 (4) Å] occur in the crystal. PY - 2010 DO - https://doi.org/10.1107/S160053681004763X SN - 1600-5368 VL - 66 IS - 12 SP - o3318,sup-1 - o3318,sup-7 PB - Munksgaard CY - Copenhagen AN - OPUS4-22616 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Siegel, David A1 - Merkel, Stefan A1 - Koch, Matthias A1 - Nehls, Irene T1 - Quantification of the Alternaria mycotoxin tenuazonic acid in beer N2 - Tenuazonic acid (TA) is a major water soluble Alternaria mycotoxin. In the present work, a method for the quantification of TA in beer by liquid chromatography-ion-trap multistage mass spectrometry after derivatization with 2,4-dinitrophenylhydrazine is described. The method is based on a rapid workup procedure and features a LOD of 2 µg/kg without preconcentration using 400 mg of sample. Validation was performed for a working range of 8-500 µg/kg. A total of 43 beers of different brewing styles (pilsener, wheat beer, bock beer, dark beer and alcohol free beer) was analysed. TA was detected in 37 samples, 16 samples were above the LOQ. An average content of 11 µg/kg was found, the highest incidence being 175 ± 13 µg/kg. To our knowledge, this is the first report on the occurrence of TA in beer and beverages in general. KW - Tenuazonic acid KW - Mycotoxin KW - Beer KW - 2,4-Dinitrophenylhydrazine KW - Derivatization KW - Liquid chromatography/electrospray ionisation ion-trap multistage mass Spectrome PY - 2010 DO - https://doi.org/10.1016/j.foodchem.2009.10.070 SN - 0308-8146 VL - 120 IS - 3 SP - 902 EP - 906 PB - Elsevier CY - Amsterdam [u.a.] ; Jena AN - OPUS4-21372 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Becker, Roland A1 - Koch, Matthias A1 - Lehnik-Habrink, Petra A1 - Nehls, Irene T1 - Quantification of polychlorinated biphenyls in plastic granulates from the recycling of cables - Reference materials and interlaboratory comparison N2 - A procedure for the quantification of the PCB marker congeners 28, 52, 101, 138, 153, 180 in plastic waste form the recycling of cables in the range of content between 0.1 mg kg-1 and 20 mg kg-1 was validated. Representative reference materials for laboratory analyses were produced using granulates from different recycling processes. The method development included aspects of grinding, sieving, homogenising as well as the comparison of extraction methods and chromatographic conditions. The validated procedure foresees grinding of the technical sample to an upper particle size limit of 0.50 mm followed by extraction with an unpolar solvent such as n-hexane and gas chromatographic determination. LOD and LOQ for individual congeners ranged between 0.01 mg kg-1 and 0.08 mg kg-1. Electron capture detection (ECD) and mass selective detection (MS) were equivalent if chromatographic conditions were appropriately selected. The application of MS was advantageous in presence of significant amounts of interfering components which have been found in some cables. Three reference materials containing the marker congeners in the range of 0.1 mg kg-1–5 mg kg-1 were submitted to a final validation intercomparison with 23 selected field laboratories using the developed method. Relative reproducibility standard deviations varied between 15% and 33%. KW - PCB KW - Waste KW - Analysis KW - Method validation KW - Standardisation PY - 2006 DO - https://doi.org/10.1016/j.chemosphere.2006.02.035 SN - 0045-6535 SN - 0366-7111 VL - 65 IS - 9 SP - 1652 EP - 1659 PB - Elsevier Science CY - Kidlington, Oxford AN - OPUS4-14050 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mönch, Bettina A1 - Becker, Roland A1 - Nehls, Irene T1 - Quantification of ethyl glucuronide in hair: effect of milling on extraction efficiency N2 - Aim: The objective of the study was to provide conclusive evidence for the effect of particle size reduction as by milling on the extractable content of ethyl glucuronide (EtG) of hair samples. Methods: A number of real case hair samples and two pooled hair materials with EtG contents in the range of 10–30 pg/mg were systematically compared with regard to the extraction yield of EtG after cutting to 2–3 mm length and pulverization with a ball mill. After the respective treatment the samples were submitted to aqueous extraction followed by quantification of EtG using HPLC-MS/MS. Results: It was unequivocally demonstrated that milling of hair samples prior to aqueous extraction significantly increases the extractable EtG content compared with cut hair. The effect ranged between 137 and 230% and was seen to occur regardless of the extent of pulverization. Cooling of samples was not necessary to prevent partial degradation of EtG during the grinding procedure. Conclusion: The options currently employed at choice in analytical practice (cutting or milling) were seen to significantly affect the extractable amount of EtG in hair. This is suspected to influence the degree of equivalence of quantification results obtained in different laboratories as well as their respective classification of a test subject's drinking behaviour on the basis of currently recommended cut-off values. PY - 2013 DO - https://doi.org/10.1093/alcalc/agt059 SN - 0735-0414 SN - 0309-1635 SN - 1464-3502 VL - 48 IS - 5 SP - 558 EP - 563 PB - Univ. Press CY - Oxford AN - OPUS4-28843 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dorgerloh, Ute A1 - Theissen, H. A1 - Becker, Roland A1 - Hilbert, S. A1 - Nehls, Irene T1 - Probennahme und Quantifizierung von LHKW, Ethen und Methan in Grundwasser N2 - Der Einsatz aktiver (Pumpprobennahme, Schöpfprobennahme) und passiver (Diffusionsprobennahme) Probennahmetechniken zur Gehaltsbestimmung von LHKW sowie Ethen und Methan in Grundwasser wird aus ordnungsbehördlicher Sicht hinsichtlich der Vergleichbarkeit von Analysendaten untersucht. Am Beispiel einer Kontamination mit Trichlorethen sowie 1,2-Dichlorethen und Vinylchlorid kann deutlich gemacht werden, dass die Einsatzmöglichkeit der passiven Probennahme durch unzureichende Strömungsverhältnisse im Aquifer sowie biologische Aktivität im Pegelrohr begrenzt ist. Der aktiven Probennahme ist bei ungeklärten oder unzureichenden Strömungsverhältnissen im Grundwasserleiter daher der Vorzug zu geben. Das gaschromatographische Verfahren für Vinylchlorid mittels Dampfraumtechnik wird um die Quantifizierung von Methan und Ethen erweitert. Dabei werden für die Bewertung von Altlasten relevante Bestimmungsgrenzen von 0,1 µg/l (Vinylchlorid, Ethen) sowie 5 µg/l (Methan) erreicht. Aus der Validierung der Analysenmethode und den Ergebnissen verschiedener Probennahmen werden Toleranzbereiche für die Ergebnisse eines Grundwassermonitorings abgeschätzt. Diese Streubreiten von Monitoring- Ergebnissen sollten von Ingenieurbüros und zuständigen Ordnungsbehörden bei der Bewertung der komplexen Abbauprozesse eines LHKW-Grundwasserschadens beachtet werden. KW - Passive sampling KW - Active sampling KW - Groundwater KW - Trichloroethene KW - Vinyl chloride KW - Methane PY - 2010 DO - https://doi.org/10.1007/s00767-010-0144-7 SN - 1430-483X VL - 15 IS - 4 SP - 231 EP - 239 PB - Springer CY - Berlin ; Heidelberg AN - OPUS4-22617 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Dorgerloh, Ute A1 - Theißen, H. A1 - Becker, Roland A1 - Nehls, Irene T1 - Probenahme von LHKW in Grundwasser: Vergleich von aktiver und passiver Probenahme KW - Grundwasser KW - Probenahme KW - LHKW KW - Pumpprobe KW - Diffusionsprobe KW - PDB PY - 2009 SN - 1618-3258 SN - 1617-5301 VL - 15 IS - 4 SP - 85 EP - 87 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-20624 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Scharkoi, O. A1 - Becker, Roland A1 - Esslinger, Susanne A1 - Weber, M. A1 - Nehls, Irene T1 - Predicting sites of cytochrome P450-mediated hydroxylation applied to CYP3A4 and hexabromocyclododecane N2 - This article describes a simple and quick in silico method for the prediction of cytochrome P450 (CYP)-mediated hydroxylation of drug-like compounds. Testosterone and progesterone, two known substrates of CYP3A4, are used to test the method. Further, we apply the procedure to predict sites of hydroxylation of isomers of the flame retardant hexabromocyclododecane by CYP3A4. Within the method, the compound is rotated in the binding pocket of the cytochrome, so that each hydrogen under consideration is placed near the active centre. Afterwards, short molecular dynamics simulations are provided for each step of the rotation. All steps of the simulation are compared concerning the distances between the hydrogens and the active centre and the corresponding energies. The computational results correlate well with experimental results. KW - Predicting sites of metabolism KW - Cytochrome P450 KW - Hydroxylation KW - Metabolism of HBCD PY - 2015 DO - https://doi.org/10.1080/08927022.2014.898845 SN - 0892-7022 SN - 1029-0435 VL - 41 IS - 7 SP - 538 EP - 546 PB - Gordon and Breach CY - New York, NY AN - OPUS4-30492 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Scharkoi, O. A1 - Esslinger, Susanne A1 - Becker, Roland A1 - Weber, M. A1 - Nehls, Irene T1 - Phase I oxidation of alpha- and gamma-hexabromocyclododecane by cytochrome P450 enzymes: simulation of the steroisomerism of hydroxylated metabolites T2 - DIOXIN 2011 CY - Brussels, Belgium DA - 2011-08-21 KW - Bromierte Falmmschutzmittel KW - Hexabromcyclododecan KW - Cytochrom KW - Metaboliten KW - HPLC KW - Simulation PY - 2011 UR - http://www.dioxin20xx.org/pdfs/2011/1810.pdf SN - 1026-4892 VL - 73 SP - 730 EP - 733 AN - OPUS4-27263 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Walther, Wolfgang A1 - Becker, Roland A1 - Nehls, Irene A1 - Lehmann, Andreas A1 - Redlich, Christel A1 - Flemig, Sabine A1 - Dorgerloh, Ute A1 - Win, Tin A1 - Buge, Hans-Gerhard T1 - Pentchlorophenol (PCP) in Soil - Certified Reference Materials for Environmental Analysis T2 - Analytica Conference 2002 CY - Munich, Germany DA - 2002-04-23 PY - 2002 SP - 1(?) AN - OPUS4-1389 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nehls, Irene A1 - Becker, Roland A1 - Buge, Hans-Gerhard T1 - Pentachlorphenol - Eine Altlast im Holz PY - 2005 UR - http://archiv.aktuelle-wochenschau.de/2005/woche19/woche19.html IS - 19 SP - 1 EP - 2 PB - Gesellschaft Deutscher Chemiker CY - Frankfurt am Main AN - OPUS4-10845 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Walther, Wolfgang A1 - Becker, Roland A1 - Lehmann, Andreas T1 - Pentachlorophenol (PCP) in soil - certified reference materials BAM-U008 and BAM-U009 for environmental analysis T2 - Analytica Conference 2002 CY - Munich, Germany DA - 2002-04-23 PY - 2002 AN - OPUS4-5854 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Köppen, Robert A1 - Becker, Roland A1 - Jung, Christian A1 - Nehls, Irene T1 - On the thermally induced isomerisation of hexabromocyclododecane stereoisomers N2 - The interconversion of the stereoisomers contained in technical 1,2,5,6,9,10-hexabromocyclododecane, a major brominated flame retardant increasingly found in the environment and in biota, was investigated at elevated temperatures. The application of pure enantiomers of the three constituents α-, β-, and γ-HBCD enabled the unambiguous elucidation of the individual isomerisation reactions as well as the quantification of all respective rate constants. At 160 °C the rate constants range over two orders of magnitude from 1.50 × 10-3 to 1.88 × 10-5 mol(%) s-1. A preliminary mechanistic explanation for the differences of the rate constants which govern the composition of HBCD diastereomers at equilibrium is given. KW - Flame retardant KW - Diastereomers KW - Enantiomers KW - Rearrangement KW - Kinetics KW - HBCD PY - 2008 DO - https://doi.org/10.1016/j.chemosphere.2007.11.009 SN - 0045-6535 SN - 0366-7111 VL - 71 IS - 4 SP - 656 EP - 662 PB - Elsevier Science CY - Kidlington, Oxford AN - OPUS4-17753 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Retter, Utz A1 - Koch, Matthias A1 - Nehls, Irene T1 - On the improvement of the standard method DIN 38409 T2 - Institutskolloquium CY - Thessaloniki, Greece DA - 2000-11-29 PY - 2000 AN - OPUS4-1028 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Fischer-Tenhagen, C. A1 - Johnen, D. A1 - Heuwieser, W. A1 - Becker, Roland A1 - Schallschmidt, Kristin A1 - Nehls, Irene T1 - Odor Perception by Dogs: Evaluating Two Training Approaches for Odor Learning of Sniffer Dogs N2 - In this study, a standardized experimental set-up with various combinations of herbs as odor sources was designed. Two training approaches for sniffer dogs were compared; first, Training with a pure reference odor, and second, training with a variety of odor mixtures with the target odor as a common denominator. The ability of the dogs to identify the target odor in a new context was tested. Six different herbs (basil, St. John’s wort, dandelion, marjoram, parsley, ribwort) were chosen to produce reference materials in various mixtures with (positive) and without (negative)chamomile as the target odor source. The dogs were trained to show 1 of 2 different behaviors, 1 for the positive, and 1 for the negative sample as a yes/no task. Tests were double blind with one sample presented at a time. In both training approaches, dogs were able to detect chamomile as the target odor in any presented mixture with an average sensitivity of 72% and a specificity of 84%. Dogs trained with odor mixture containing the target odor had more correct indications in the transfer task. KW - dog training KW - herbs KW - reference materials, KW - scent dog KW - smell KW - training model PY - 2017 DO - https://doi.org/10.1093/chemse/bjx020 SN - 1464-3553 SN - 0379-864X VL - 42 IS - 5 SP - 435 EP - 441 PB - Oxford University Press AN - OPUS4-40786 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Neuhof, Torsten A1 - Koch, Matthias A1 - Rasenko, Tatjana A1 - Nehls, Irene T1 - Occurrence of zearalenone in wheat kernels infected with Fusarium culmorum N2 - The aim of this study was to investigate the distribution of zearalenone in wheat kernels contaminated with this mycotoxin. Kernels from a sample of a wheat harvest affected by Fusarium culmorum were sorted into six groups according to their visual attributes. Milled portions of these groups were analysed by high-performance liquid chromatography with fluorescence and diode array detection. The clean-up was performed with an immunoaffinity column after methanol/water (4:1, v/v) extraction. The zearalenone content of the unsorted kernel fraction was 74 µg/kg. The group of healthy-looking kernels was contaminated with only 6 µg/kg of zearalenone. The groups of kernels that appeared shrunken and chalky white, damage routinely caused by Fusarium, were contaminated with 170 and 117 µg/kg, respectively. A remarkably high level of zearalenone contamination, 2,184 µg/kg, was observed for the group of reddish kernels. An association between the presence of the red pigment aurofusarin and high levels of zearalenone was found. Therefore, this pigment may be used as a marker of high zearalenone content. KW - Zearalenone KW - Aurofusarin KW - Immunoaffinity column KW - HPLC-FLD/DAD PY - 2008 DO - https://doi.org/10.3920/WMJ2008.1055 SN - 1875-0710 SN - 1875-0796 VL - 1 IS - 4 SP - 429 EP - 435 PB - Wageningen Academic Publishers CY - Wageningen AN - OPUS4-18329 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Wachholz, Sigrid A1 - Lehnik-Habrink, Petra A1 - Becker, Roland A1 - Win, Tin T1 - Neue Referenzmaterialien für die organische Analytik als Instrumente der Qualitätssicherung T2 - Tagung "Tag der Chemie" CY - Potsdam, Deutschland DA - 2000-11-08 PY - 2000 AN - OPUS4-1000 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Wachholz, Sigrid A1 - Lehnik-Habrink, Petra A1 - Becker, Roland A1 - Win, Tin T1 - Neue Referenzmaterialien für die organische Analytik als Instrumente der Qualitätssicherung T2 - Tag der Chemie, Wissenschaftspark Golm CY - Potsdam, Germany DA - 2000-11-08 PY - 2000 AN - OPUS4-5725 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Koch, Matthias A1 - Köppen, Robert A1 - Nehls, Irene T1 - Neue Mykotoxin-Referenzmaterialien - Qualitätssicherung in der Lebensmittelanalytik N2 - Die zuverlässige Überwachung geltender Mykotoxin-Grenzwerte ist elementarer Bestandteil von Lebensmittelsicherheit und Verbraucherschutz. Durch die zunehmende Bedeutung der Qualitätssicherung ist auch die Nachfrage an zertifizierten Referenzmaterialien (ZRM) in den letzten Jahren deutlich gestiegen. Dem steht derzeit jedoch nur eine sehr begrenzte Auswahl geeigneter ZRM gegenüber. KW - Zertifiziertes Referenzmaterial KW - ERM KW - Ochratoxin A KW - Deoxynivalenol KW - Nivalenol KW - Zearalenon KW - Kaffee KW - Wein KW - Weizen PY - 2011 SN - 0012-0413 SN - 1869-2214 IS - September SP - 434 EP - 448 PB - Wiss. Verl.-Ges. CY - Stuttgart AN - OPUS4-24616 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Köppen, Robert A1 - Koch, Matthias A1 - Klein-Hartwig, Karin A1 - Nehls, Irene T1 - Natürliche Umwelt- und Lebensmitteltoxine: Herstellung eines Referenzmaterials für die Mykotoxine T-2 und HT-2 PY - 2010 SN - 0934-3504 SN - 1865-5084 VL - 22 IS - 4 SP - 407 PB - Springer CY - Heidelberg AN - OPUS4-22205 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Mönch, Bettina A1 - Emmerling, Franziska A1 - Kraus, Werner A1 - Becker, Roland A1 - Nehls, Irene T1 - n-Propyl 2,3,4,6-tetra-O-acetyl-beta-D-glucopyranoside N2 - The title compound [systematic name: (2R,3R,4S,5R,6R) 2-(acetoxymethyl)-6-propoxytetrahydro-2H-pyran-3,4,5-triyl triacetate], C17H26O10, was formed by a Koenigs-Knorr reaction of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide and n-propanol. The central ring adopts a chair conformation. The crystal does not contain any significant interactions such as hydrogen bonds. PY - 2013 DO - https://doi.org/10.1107/S1600536812051495 SN - 1600-5368 VL - 69 IS - Part 2 SP - o158, sup-1 - sup-7 PB - Munksgaard CY - Copenhagen AN - OPUS4-27439 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Nehls, Irene A1 - Hanebeck, Olaf A1 - Becker, Roland A1 - Emmerling, Franziska T1 - N-(beta-carboxyethyl)-alpha-isoleucine N2 - The title compound, {2-[(2-carbamoylethyl)amino]-3-methylpentanoic acid}, C9H18N2O3, is of interest with respect to its biological activity. It was formed during an addition reaction between acrylamide and the amino acid isoleucine. The crystal structure is a three-dimensional network built up by intermolecular N–H···O and O–H···N hydrogen bonds. KW - Acrylamid KW - Isoleucin KW - Derivatisierung PY - 2013 DO - https://doi.org/10.1107/S160053681205146X SN - 1600-5368 VL - 69 IS - Part 2 SP - o172-o173, sup-1 - sup-7 PB - Munksgaard CY - Copenhagen AN - OPUS4-27573 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Köppen, Robert A1 - Koch, Matthias A1 - Nehls, Irene A1 - Sulyok, M. A1 - Schuhmacher, R. A1 - Krska, R. T1 - Multimykotoxin-Analytik - Giftstoffe verschiedener Schimmelpilzarten in Lebensmitteln PY - 2009 SN - 0016-3538 VL - 8 SP - 494 EP - 497 PB - GIT-Verlag CY - Darmstadt AN - OPUS4-19912 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Köppen, Robert A1 - Koch, Matthias A1 - Nehls, Irene A1 - Sulyok, M. A1 - Schuhmacher, R. A1 - Krska, R. T1 - Multimykotoxin-Analytik - Giftstoffe verschiedener Schimmelpilzarten in Lebensmitteln PY - 2009 SN - 1619-8662 SN - 0946-7726 VL - 9-10 SP - 34 EP - 37 PB - GIT-Verlag CY - Darmstadt AN - OPUS4-20139 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Lehnik-Habrink, Petra A1 - Hein, Sebastian A1 - Win, Tin A1 - Bremser, Wolfram A1 - Nehls, Irene T1 - Multi-residue analysis of PAH, PCB, and OCP optimized for organic matter of forest soil KW - DDT breakdown KW - Extraction efficiency KW - Forest soil KW - Multi-residue analysis KW - Organic pollutants KW - Soil organic matter PY - 2010 DO - https://doi.org/10.1007/s11368-010-0241-3 SN - 1439-0108 VL - 10 IS - 8 SP - 1487 EP - 1498 PB - Springer CY - Berlin; Heidelberg AN - OPUS4-22945 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Becker, Roland A1 - Buge, Hans-Gerhard A1 - Bremser, Wolfram A1 - Nehls, Irene T1 - Mineral oil content in sediments and soils: comparability, traceability and a certified reference material for quality assurance N2 - The performance of twelve laboratories with previously established proficiency in the determination of the mineral oil content in a fresh water sediment is described. The summation parameter total petrol hydrocarbon (TPH) is defined according to ISO 16703:2004 with regard to the sample preparation to be applied, the flame ionisation detection (FID) and the boiling range of C10–C40 to be integrated. Comprehensive tests of homogeneity and stability have been carried out on the candidate material using appropriate models. The outcome of the study served as the basis for the certification of the candidate reference material as ERM-CC015a. The certified mass fraction is 1,820±130mgkg-1 and traceability was established by using an appropriate calibration standard certified for the mass fraction of C10–C40. The interlaboratory scatter of measurement results in this exercise can largely be explained by the variability of the individual calibrations based on this common calibration standard. KW - Total petroleum hydrocarbons KW - Extraction KW - Gas chromatography KW - Calibration KW - Interlaboratory study PY - 2006 DO - https://doi.org/10.1007/s00216-006-0423-4 SN - 1618-2642 SN - 1618-2650 VL - 385 IS - 3 SP - 645 EP - 651 PB - Springer CY - Berlin AN - OPUS4-12399 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kuhlich, Paul A1 - Emmerling, Franziska A1 - Piechotta, Christian A1 - Nehls, Irene T1 - Methyl 3,5,5,6,8,8-hexamethyl-5,6,7,8-tetrahydronaphthalene-2-carboxylate (AHTN-COOMe) N2 - Crystals of the title compound, C18H26O2, were grown from ethyl acetate. Due to the racemic precursor, the title compound is also obtained as a racemate. Disorder was observed during structure refinement, originating from two possible half-chair conformations of the non-aromatic ring. The disorder was refined by introducing split positions in the cyclo-hexane ring regarding the two possible R and S-enantiomers at the chiral CH group [ratio 0.744 (3):0.256 (3)]. The crystal structure features pairs of inversion-related molecules connected by pairs of non-classical C–H···O hydrogen bonds. KW - AHTN KW - Tonalide KW - Cyclic musk KW - AHTN-COOMe KW - Disinfection by-product KW - Esterification PY - 2011 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-232769 DO - https://doi.org/10.1107/S1600536811002601 SN - 1600-5368 VL - E67 IS - 2 SP - o485, sup-1 EP - sup-11 PB - Munksgaard CY - Copenhagen AN - OPUS4-23276 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Schwarzer, Martin A1 - Becker, Roland A1 - Kuhnhardt, Claus A1 - Nehls, Irene T1 - Methodenvergleich zur Bestimmung von extrahierbaren organischem Halogen (EOX) in Bodenproben N2 - Ziel der vorliegenden Untersuchungen, die im Rahmen einer Diplomarbeit der Fachhochschule Lausitz/Senftenberg an der BAM durchgeführt wurden, war ein Vergleich unterschiedlicher Extraktionsverfahren für die Bestimmung von extrahierbarem organischem Halogen (EOX) in Bodenproben. EOX ist ein für die rasche Bewertung der Organochlor- Belastung kontaminationsverdächtiger Flächen wertvoller Summenparameter, der sämtliche mit organischen Lösungsmittel extrahierbare Organohalogenverbindungen erfasst. Gegenwärtig existiert jedoch kein für die Bodenanalytik genormtes Verfahren für die Durchführung von EOX-Bestimmungen. Daher wird in der Praxis auf das für Schlämme und Sedimente entwickelte Verfahren nach DIN 38414 S17 (1990) zurückgegriffen, so auch in der Bundesbodenschutz- und Altlasten-Verordung (BBodSchV). Literaturangaben und Erfahrungen mit der Wiederfindungsrate polarer Extraktionsmittel und moderner Extraktionsverfahren bei Organochlorpestiziden, die eine bedeutende Quelle für EOX in Schlämmen und Böden darstellen, lassen vermuten, dass das genannte Normverfahren systematisch zu Unterbefunden neigen könnte. Für die Untersuchungen wurden an der BAM entwickelte Boden-Referenzmaterialien mit "natürlicher", über jahrzehntelangen Eintrag entstandener DDT- und Lindan-Belastung verwendet. Neben den klassischen Extraktionsverfahren nach Soxhlet kamen die ultraschallunterstützte Extraktion, die Mikrowellen- und die beschleunigte Lösungsmittelextraktion (ASE) jeweils mit Lösungsmitteln unterschiedlicher Polarität zum Einsatz. Extraktionsausbeuten und Wiederholpräzision der einzelnen Varianten wurden verglichen und vor dem Hintergrund der Ergebnisse unabhängiger Verfahren wie der gaschromatographischen Bestimmung der einzelnen Organochlorverbindungen bewertet. Die Polarität des Extraktionsmittels weist auch bei trockenen Böden den größten Einfluss auf die Extraktionsausbeuten der in den untersuchten Proben enthaltenen Organochlorverbindungen auf. Die Mischung Hexan/Aceton (1:1), die sich für die Extraktion verschiedener organischer Parameter bewährt hat, ist hinsichtlich der EOX-Analytik der existierenden Norm überlegen. T3 - BAM Forschungsberichtreihe - 263 PY - 2003 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-1884 SN - 978-3-86509-083-4 SN - 0938-5533 VL - 263 SP - 1 EP - 64 PB - Wirtschaftsverlag NW CY - Bremerhaven AN - OPUS4-188 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Koch, Matthias A1 - Jancke, Harald A1 - Nehls, Irene T1 - Messung und Quantifizierung von Mineralölkohlenwasserstoffen - Ein Vergleich von FT/IR, GC-FID und 1H-NMR KW - H-1-Kernresonanz-Spektroskopie KW - H-1-NMR KW - Fourier-Transform-Infrarot-Spektroskopie KW - FT/IR KW - GC-FID KW - Kapillargaschromatographie-Flammenionisationsdetektion KW - MKW KW - Mineralölkohlenwasserstoffe KW - Umweltanalytik PY - 1999 SN - 0934-3504 SN - 1865-5084 VL - 11 IS - 1 SP - 9 EP - 14 PB - Springer CY - Heidelberg AN - OPUS4-7041 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Merkel, Stefan A1 - Köppen, Robert A1 - Koch, Matthias A1 - Emmerling, Franziska A1 - Nehls, Irene T1 - Lysergol monohydrate N2 - In the title compound [systematic name: (7-methyl-4,6,6a,7,8,9-hexahydroindolo[4,3,2-fg]quinoline-9-yl)methanol monohydrate], C16H18N2O·H2O, the non-aromatic ring (ring C of the ergoline skeleton) directly fused to the aromatic rings is nearly planar, with a maximum deviation of 0.659 (3) Å, and shows an envelope conformation. In the crystal, hydrogen bonds between the lysergol and water molecules contribute to the formation of layers parallel to (10-2). PY - 2012 DO - https://doi.org/10.1107/S1600536812002632 SN - 1600-5368 VL - 68 IS - 2 SP - o523, sup1 EP - sup8 PB - Munksgaard CY - Copenhagen AN - OPUS4-25401 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Merkel, Stefan A1 - Köppen, Robert A1 - Koch, Matthias A1 - Emmerling, Franziska A1 - Nehls, Irene T1 - Lumi-ergometrine - structural identification and occurrence in sclerotia N2 - The fungus Claviceps purpurea grows on grasses and cereal grains and produces six predominant ergot alkaloids. These toxic substances undergo different transformation reactions during storage and cereal processing. One of these reactions is the addition of water to a double bond in the ergoline skeleton. Since light is required for this process, the substances formed were named lumi-ergot alkaloids. From these, a new asymmetric carbon and consequently two epimers with different polarities are formed. For investigations of lumi-ergot alkaloids, ergometrine was used exemplarily as it represents one of the six ergot alkaloids predominantly formed by Claviceps purpurea. The main reaction product, the less polar compound of the two lumiergometrine epimers, was separated by HPLC and unambiguously identified as 10-(S)-lumi-ergometrine using X-ray structural analysis. A HPLC-MS/MS method was developed for the detection of this substance in sclerotia extracts. Using this method, the existence of both epimeric forms of lumiergometrine could be proved in the sclerotia. This is the first time that the existence of a lumi-transformation product of ergot alkaloids was proved in naturally grown samples. KW - Lumi-ergot alkaloids KW - Sclerotia KW - Claviceps purpurea KW - HPLC-MS/MS PY - 2012 DO - https://doi.org/10.1007/s12550-011-0116-5 SN - 0178-7888 VL - 28 IS - 1 SP - 59 EP - 66 PB - Springer CY - Berlin; Heidelberg AN - OPUS4-25442 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Neuhof, Torsten A1 - Köppen, Robert A1 - Koch, Matthias A1 - Nehls, Irene T1 - Letter: High-performance liquid chromatography/electrospray mass spectrometry analysis of the mycotoxin aurofusarin N2 - High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) can be used for simultaneous quantification of various mycotoxins in contaminated food samples. Therefore, multi-mycotoxin methods have been developed in the last couple of years. To enlarge these methods for further analytes, we have developed a LC-MS/MS method for the quantification of the mycotoxin aurofusarin. Additionally, further LC-MSn experiments were performed to demonstrate the fragmentation pattern of aurofusarin. Applicable multiple reaction monitoring (MRM) transitions of aurofusarin were found and optimized by parameter variation of the tandem mass spectrometer. The applicability of the developed method was tested by analysis of naturally contaminated wheat. KW - LC-MS/MS KW - Multi-mycotoxin method KW - Aurofusarin PY - 2008 DO - https://doi.org/10.1255/ejms.935 SN - 1469-0667 SN - 1356-1049 SN - 1365-0718 VL - 14 IS - 5 SP - 329 EP - 333 PB - IM Publications CY - Chichester AN - OPUS4-18199 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Koch, Matthias A1 - Neuhof, Torsten A1 - Nehls, Irene ED - Jörg Peter Matthes, ED - Markus Frasch, ED - Marx, Wolfram ED - Johannes Oeler, T1 - Lebensmittelanalytik - Neue Referenzmaterialien KW - Referenzmaterialien KW - Acrylamid KW - Ochratoxin A KW - Methylquecksilber PY - 2007 VL - 3 IS - 5 SP - 16 EP - 17 PB - Succidia Verl. & Kommunikation CY - Darmstadt AN - OPUS4-16691 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Koch, Matthias A1 - Köppen, Robert A1 - Siegel, David A1 - Merkel, Stefan A1 - Piechotta, Christian A1 - Becker, Roland A1 - Win, Tin T1 - Lebensmittelanalytik - eine neue Herausforderung für die BAM T2 - Lebensmittelchemisches Kolloquium der Universität Hohenheim CY - Stuttgart, Germany DA - 2009-11-19 PY - 2009 AN - OPUS4-20584 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Nehls, Irene A1 - Koch, Matthias A1 - Köppen, Robert A1 - Siegel, David A1 - Merkel, Stefan A1 - Piechotta, Christian A1 - Becker, Roland A1 - Win, Tin T1 - Lebensmittelanalytik - eine neue Herausforderung an die BAM T2 - Einladung zum Institutskolloquium, Institut für Landschaftsdynamik, Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e. V. CY - Müncheberg, Germany DA - 2010-02-16 PY - 2010 AN - OPUS4-21058 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -