Results 131 to 140 of about 357 (143)

Development and Evaluation of a Candidate Reference Measurement Procedure for the Determination of 19-Norandrosterone in Human Urine Using Isotope-Dilution Liquid Chromatography/Tandem Mass Spectrometry

Analytical Chemistry, 2006
19-Norandrosterone (19-NA) is the major metabolite of the steroid nandrolone, one of the most commonly abused anabolic androgenic agents. 19-NA exists mainly as the glucuronide form in human urine. A candidate reference measurement procedure for 19-NA in urine involving isotope dilution coupled with liquid chromatography/tandem mass spectrometry (LC/MS/
Susan S.-C. Tai, Bei Xu, Lorna T. Sniegoski, Michael J. Welch   +3 more
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Profiling 19‐norsteroids. II—tandem mass spectrometric characterization of the heptafluorobutyryl ester and pentafluorobenzyloxime heptafluorobutyryl ester derivatives of 19‐norandrosterone using collisionly activated dissociation

Journal of Mass Spectrometry, 1995
AbstractTandem mass spectrometric methods for the identification of 19‐nortestosterone (estr‐4‐en‐17β‐3‐one) are described and evaluated. The fragmentation reactions of the heptafluorobutyryl (HFB) and pentafluorobenzyloxime heptafluorobutyryl (PFBOHFB) ester derivatives of 19‐nortestosterone in particular were studied for the purpose to select ...
Douwe de Boer, S. N. Bensink, A. R. Borggreve, R. D. van Ooijen, R. A. A. Maes   +4 more
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Identification of endogenous 19-norandrosterone in human urine

, 1999
Bruno Le Bizec, Isabelle Gaudin, A. Pohu, Fabrice Monteau, François André   +4 more
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Method validation for the detection of the anabolic–androgenic steroids methenolone and 19-norandrosterone in wastewater and application to real wastewater samples

Environmental Monitoring and Assessment
Berfin Sude Ertas, Harun Şener, İsmail Ethem Gören, Aslı Atasoy, Rüştü Güner, Nebile Dağlıoğlu   +5 more
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Modulation of phase II metabolism: A case study on 19-norandrosterone

2014
19-norandrosterone is the main phase I metabolite of the synthetic androgenic anabolic steroid (AAS) 19-nortestosterone (or nandrolone). Once formed 19-norandrosterone undergoes conjugation reaction catalyzed mainly by the uridine diphospho glucuronosyltransferases (UDPGTs) to form the corresponding glucuro-conjugated. Due to the fact that the presence
Mazzarino, M, Alessi, B, de la Torre, X, Fiacco, I, PALERMO, AMELIA, BOTRE', Francesco   +5 more
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Nandrolone criteria for 19-norandrosterone Isotope Ratio Mass Spectrometric confirmation

2014
The detection of the use of nandrolone and other 19-norsteroids is based primarily upon the identification of the main urinary metabolite, 19-norandrosterone (19-NA) in a concentration (derived from hydrolysis with β-glucuronidase) greater than the Decision Limit (DL), as established in the DL Technical Document.
X. de la Torre, C. Colamonici, D. Curcio, A. Beotra, S. Jain, T. Kaur, A. Shrivastava, BOTRE', Francesco   +7 more
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GC-ion trap-MS in doping control: urinary determination of 19-norandrosterone and 19-noretiocholanolone at subnanogram per millilitre levels

2002
A specific and sensitive method was developed for the quali-quantitative determination in urine of 19- norandrosterone (19-NA) and 19-noretiocholanolone (19-NE), main metabolites of the anabolic androgenic steroid nandrolone as well as of other 19-norsteroids. The total steroid fraction, extracted from urine, after addition of Ds-noretiocholanolone, by
Tedeschi L, FAVRETTO, DONATA, Frison G, Maietti S, CASTAGNA, FRANCA, FERRARA, SANTO   +5 more
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Endogenous origin of norandrosterone in female urine: indirect evidence for the production of 19-norsteroids as by-products in the conversion from androgen to estrogen

, 2001
Peter Van Eenoo, F.T. Delbeke, Frank H. de Jong, Patrick De Backer   +3 more
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Detection of 19-norandrosterone after ingestion of the oral contraceptives norethisterone acetate and lynestrenol and ethylestrenol

, 2006
Peter Van Eenoo, Petra Mikulčíková, Wim Van Thuyne, Koen Deventer, F.T. Delbeke   +4 more
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19-Norandrosterone origin: a simple procedure for GC/C/IRMS sample preparation by HPLC

2011
de la Torre X, Colamonici C, Curcio D, Molaioni F, Pizzardi M, Castrignanò E, BOTRE', Francesco   +6 more
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