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69479

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Bin Huang et al.
Environmental science and pollution research international, 21(22), 12898-12908 (2014-07-01)
The occurrence and behavior of endocrine disrupting chemicals (EDCs) in sewage treatment plants (STPs), especially estrogens and phenols, have been closely concerned in previous studies. However, the systematical researches about progestogens and androgens were scarce in STPs adopting different treatment
Guro Forsdahl et al.
Journal of separation science, 27(1-2), 110-114 (2004-09-01)
A sensitive method for the quantification of free salbutamol in human urine is described. Sample clean up is performed using SPE on a mixed phase extraction column. Derivatisation is performed with N-methyl-N-trimethylsilyltrifluoroacetamide (MSTFA) and the extract is analysed by GC-MS.
Christiane Haas et al.
Zeitschrift fur Naturforschung. C, Journal of biosciences, 63(9-10), 699-705 (2008-12-02)
A cell suspension culture of sunflower (Helianthus annuus), a producer of immunologically active polysaccharides, was cultivated in a 5-L stirred tank bioreactor, operated in batch mode. After some changes in the internal bioreactor design a stable growth of Helianthus cells
Vera Maresova et al.
Neuro endocrinology letters, 29(5), 749-754 (2008-11-07)
The purpose of this study is to develop the gas chromatographic-mass spectrometric method (GC-MS) for screening and semiquantification of drugs and drugs of abuse in human serum. GC-MS method after liquid-liquid extraction (LLE) and derivatization with N-methyl-N-trimethylsilyltrifluoroacetamide (MSTFA) is presented
Su Yun Lee et al.
Food chemistry, 165, 157-166 (2014-07-21)
In this study, a comprehensive metabolite profile analysis of doenjang, a fermented soybean paste, at various steps of its industrial 5-step production process was conducted, by combining gas and liquid chromatography-mass spectrometry techniques with multivariate analysis. From the partial least
M.Donike
Journal of Chromatography A, 85, 1-1 (1973)
Gabriela Venturini et al.
American journal of physiology. Cell physiology, 317(2), C326-C338 (2019-05-09)
Atherosclerotic plaque development is closely associated with the hemodynamic forces applied to endothelial cells (ECs). Among these, shear stress (SS) plays a key role in disease development since changes in flow intensity and direction could stimulate an atheroprone or atheroprotective
M. Donike
Journal of Chromatography A, 115, 591-591 (1975)
H S Shin et al.
Journal of analytical toxicology, 22(1), 55-60 (1998-03-10)
Urinary metabolites of famprofazone following oral administration in humans were identified by gas chromatography-mass spectrometry with electron impact-ionization and comparison with the spectra and retention times of authentic standards. The metabolites were determined following selective derivatization with N-methyl-bis-trifluoroacetamide (MBTFA) and
M. Donike
Journal of Chromatography A, 42, 103-103 (1969)
Pierluigi Caboni et al.
The journal of maternal-fetal & neonatal medicine : the official journal of the European Association of Perinatal Medicine, the Federation of Asia and Oceania Perinatal Societies, the International Society of Perinatal Obstetricians, 27 Suppl 2, 4-12 (2014-10-07)
Physiological changes leading to parturition are not completely understood while clinical diagnosis of labour is still retrospective. Gas chromatography mass spectrometry (GC/MS) and nuclear magnetic resonance spectroscopy (NMR) represent two of the main analytical platforms used in clinical metabolomics. Metabolomics
J.Eyem and L.Bergstedt
Biochem. Mass Spectrom., 1, 1497-1497 (1976)
Davide Bressanello et al.
Journal of chromatography. A, 1361, 265-276 (2014-08-28)
This study investigates the potential of a parallel dual secondary column-dual detection two-dimensional comprehensive GC platform (GC×2GC-MS/FID) for metabolic profiling and fingerprinting of mouse urine. Samples were obtained from a murine model that mimics a typical unhealthy Western diet featuring
Michael Stitz et al.
The Plant cell, 26(10), 3964-3983 (2014-10-19)
Jasmonic acid and its derivatives (jasmonates [JAs]) play central roles in floral development and maturation. The binding of jasmonoyl-L-isoleucine (JA-Ile) to the F-box of CORONATINE INSENSITIVE1 (COI1) is required for many JA-dependent physiological responses, but its role in anthesis and
Hye-Ran Yoon et al.
Archives of pharmacal research, 33(2), 317-323 (2010-03-03)
If early diagnosis is not made, patients with peroxisomal disorders rapidly progress to sudden death, physical defect or mental retardation resulted in storage of the toxic material into the brain. Therefore, it is necessary to develop the analytical method for
M. Donike
Chromatographia, 9, 440-440 (1976)
Stina K Lien et al.
Journal of chromatography. A, 1247, 118-124 (2012-06-15)
GC-MS analysis of silylated metabolites is a sensitive method that covers important metabolite groups such as sugars, amino acids and non-amino organic acids, and it has become one of the most important analytical methods for exploring the metabolome. Absolute quantitative
Kai Lun Chang et al.
PloS one, 9(8), e104621-e104621 (2014-08-08)
Findings from epidemiology, preclinical and clinical studies indicate that consumption of coffee could have beneficial effects against dementia and Alzheimer's disease (AD). The benefits appear to come from caffeinated coffee, but not decaffeinated coffee or pure caffeine itself. Therefore, the
Gas chromatographic determination of nitrosoamino acids by trimethylsilylation and single-ion monitoring in a gas chromatography-mass spectrometry system.
G Eisenbrand et al.
IARC scientific publications, 14(14), 21-26 (1976-01-01)
M H Choi et al.
The Journal of pharmacy and pharmacology, 51(1), 53-59 (1999-04-10)
The metabolism of clemastine, 2-[2-[1-(4-chlorophenyl)-1-phenylethoxylethyl])-1-methylpyrrolidin e, has been studied in three adult male volunteers after a single oral dose of 20 mg as the fumarate. After enzymatic hydrolysis solvent extracts of urine were derivatized with N-methyl-N-trimethylsilyltrifluoroacetamide-ammonium iodide and analysed by
Michael Kress et al.
Clinical laboratory, 48(9-10), 535-540 (2002-10-23)
A method is described which uses a combination of gas chromatography and isotope dilution-mass spectrometry (GC-IDMS) to determine the concentration of theophylline (1,3-dimethyl xanthine) in human plasma or serum samples. The effects of similar substituted xanthines - namely theobromine (3,7-dimethyl
Ali Shareef et al.
Journal of chromatography. A, 1108(1), 121-128 (2006-02-01)
This paper reports an improved silylation procedure for simultaneous determination of the steroid hormones 17alpha-ethinylestradiol (EE2) and estrone (E1) using gas chromatography-mass spectrometry (GC-MS). This follows a re-assessment of some of the popular silylation procedures using N-methyl-N-trimethylsilyltrifluoroacetamide (MSTFA), N-O-bis-(trimethylsilyl)-trifluoroacetamide (BSTFA)
Mario Thevis et al.
European journal of mass spectrometry (Chichester, England), 10(5), 673-681 (2004-11-09)
Synthesis and mass spectrometric characterization of drugs or metabolites labeled by stable isotopes has been of great interest in fields of clinical, forensic and doping control analysis. Deuterated ephedrine and p-hydroxypseudoephedrine were prepared from corresponding amines by a novel procedure
Sumandeep Rana et al.
Journal of analytical toxicology, 32(5), 355-363 (2008-06-12)
A method for the simultaneous determination of six commonly prescribed cyclic antidepressants and their major metabolites in urine is presented. This method can be used for quantitation of amitriptyline, nortriptyline, imipramine, desipramine, doxepin, desmethyldoxepin, and maprotiline in human urine, in
Nicolás M Cecchini et al.
Molecular plant-microbe interactions : MPMI, 28(4), 455-466 (2014-11-06)
Robust immunity requires basal defense machinery to mediate timely responses and feedback cycles to amplify defenses against potentially spreading infections. AGD2-LIKE DEFENSE RESPONSE PROTEIN 1 (ALD1) is needed for the accumulation of the plant defense signal salicylic acid (SA) during
Gustavo de A Cavalcanti et al.
Rapid communications in mass spectrometry : RCM, 24(22), 3297-3302 (2010-10-26)
Trimethylsilylation of anabolic agents and their metabolites is frequently achieved by using the derivatization mixture N-methyl-N-(trimethylsilyl)trifluoroacetamide (MSTFA)/NH(4)I/2-mercaptoethanol. Nevertheless, artifacts were formed when this mixture was employed in the monitoring of exemestane and its main metabolite 17β-hydroxyexemestane prior to GC-MS analysis.
Venkataramanan Subramanian et al.
Journal of proteome research, 13(12), 5431-5451 (2014-10-22)
Chlamydomonas reinhardtii is well adapted to survive under different environmental conditions due to the unique flexibility of its metabolism. Here we report metabolic pathways that are active during acclimation to anoxia, but were previously not thoroughly studied under dark, anoxic
Hee-Kyung Jeon et al.
Journal of chromatography. A, 1131(1-2), 192-202 (2006-08-08)
A novel method has been developed to simultaneously determine and quantify seven organic UV filters employing liquid (solid)-liquid extraction, derivatization with N-methyl-N-(trimethylsilyl) trifluoroacetamide (MSTFA) and gas chromatography with mass spectrometric detection in various environmental matrices. The UV filters determined were:
L Damasceno et al.
Journal of mass spectrometry : JMS, 35(11), 1285-1294 (2000-12-13)
An evaluation of derivatization procedures for the detection of beta(2)-agonists is presented. The study was performed with the beta(2)-agonists bambuterol, clenbuterol, fenoterol, formoterol, salbutamol, salmeterol and terbutaline. Different derivatizating agents were employed, aiming to obtain derivatives with high selectivity to
M.Donike
Journal of Chromatography A, 85, 9-9 (1973)
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