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Showing 1-30 of 57 results for "77249" within Papers
Toshio Takayanagi et al.
Talanta, 74(5), 1224-1230 (2008-03-29)
Perfluorinated surfactants of heptafluorobutylate and pentadecafluorooctanoate ions were adsorbed on an activated charcoal cartridge and decomposed with sodium biphenyl (SBP) reagent to form inorganic fluoride ion. The fluoride ion thus formed was determined by flow injection analysis (FIA) using quercetin-Zr
Helena Zahradnícková et al.
Journal of separation science, 32(22), 3919-3924 (2009-10-21)
Heptafluorobutyl chloroformate (HFBCF), a recently introduced derivatization reagent, was examined in enantioseparation of amino acids (AAs) by GC. Twenty proteinogenic AAs, plus ornithine, cystine and 4-fluorophenylalanine (internal standard) were treated with the reagent and separation properties of the derivatives were
Francisca Pérez et al.
Environment international, 59, 354-362 (2013-07-31)
Perfluoroalkyl substances (PFASs) are environmental pollutants with an important bioaccumulation potential. However, their metabolism and distribution in humans are not well studied. In this study, the concentrations of 21 PFASs were analyzed in 99 samples of autopsy tissues (brain, liver
Ulrika Eriksson et al.
Environmental science and pollution research international, 20(11), 7940-7948 (2013-04-17)
Diet and drinking water are suggested to be major exposure pathways for perfluoroalkyl substances (PFASs). In this study, food items and water from Faroe Islands sampled in 2011/2012 were analyzed for 11 perfluoroalkyl carboxylic acids (PFCAs) and 4 perfluoroalkane sulfonic
Andrej Frolov et al.
Analytical and bioanalytical chemistry, 392(6), 1209-1214 (2008-09-25)
Glycation is a common class of nonenzymatic posttranslational modifications relevant for several diseases and cell aging in general, such as D: -glucose-derived modifications at the epsilon-amino groups of lysine residues in blood proteins, especially albumin, immunoglobulin, and hemoglobin, for diabetic
Colton H F Wong et al.
Drug testing and analysis, 4(12), 1028-1033 (2012-06-27)
Gas chromatography-mass spectrometry (GC-MS) analysis after heptafluorobutyric anhydride (HFBA) derivatization was one of the published methods used for the quantification of ephedrine (EP) and pseudoephedrine (PE) in urine. This method allows the clear separation of the derivatized diastereoisomers on a
Merja R Häkkinen et al.
Journal of pharmaceutical and biomedical analysis, 45(4), 625-634 (2007-10-20)
A reversed phase liquid chromatography-electrospray ionization-tandem mass spectrometric method (RP-LC-ESI-MS/MS) was developed to separate and detect polyamines with minimal sample pre-treatment and without any derivatization. Prior to MS/MS analysis, a complete chromatographic separation of polyamines was achieved by a linear
Artak Tovmasyan et al.
Journal of inorganic biochemistry, 140, 94-103 (2014-08-03)
In the present study we have synthesized a novel amphiphilic porphyrin and its Ag(II) complex through modification of water-soluble porphyrinic structure in order to increase its lipophilicity and in turn pharmacological potency. New cationic non-symmetrical meso-substituted porphyrins were characterized by
Valerii I Fedchenko et al.
International journal of biological macromolecules, 78, 347-353 (2015-04-26)
Renalase is a recently discovered secretory protein involved in the regulation of blood pressure. Cells synthesize all known isoforms of human renalase (1 and 2) as flavoproteins. Accommodation of FAD in the renalase protein requires the presence of its N-terminal
Kaberi P Das et al.
Toxicological sciences : an official journal of the Society of Toxicology, 105(1), 173-181 (2008-05-31)
Perfluorobutyrate (PFBA) is a perfluoroalkyl acid (PFAA) found in the environment. Previous studies have indicated developmental toxicity of PFAAs (perfluorooctane sulfonate [PFOS] and perfluorooctanoate [PFOA]); the current study examines that of PFBA. PFBA/NH4(+) was given to timed-pregnant CD-1 mice by
Erin Gemperline et al.
Analytical methods : advancing methods and applications, 6(16), 6389-6396 (2015-02-11)
(RS)-3-(2-carboxypiperazin-4-yl)-propyl-1-phosphonic acid (CPP) is a competitive antagonist of the N-methyl-D-aspartate (NMDA) receptor and is routinely used with rodent models to investigate the role of NMDA receptors in brain function. This highly polar compound is difficult to separate from biological matrices.
Irene Delgado-Blanca et al.
Analytical and bioanalytical chemistry, 407(2), 521-528 (2014-11-06)
A new approach for the implementation of liquid-liquid extraction in a sequential injection manifold is presented. The manifold consists of two syringe pumps and one multi-position valve. The use of a 30 % MeOH/H2O (v/v) solution as the carrier, with isobutanol
Lianying Zhang et al.
Toxicology and applied pharmacology, 279(3), 275-283 (2014-07-08)
Perfluorinated compounds (PFCs) have been shown to disrupt lipid metabolism and even induce cancer in rodents through activation of peroxisome proliferator-activated receptors (PPARs). Lines of evidence showed that PPARα was activated by PFCs. However, the information on the binding interactions
Michael S Young et al.
Journal of AOAC International, 97(6), 1737-1741 (2015-01-30)
An SPE-based cleanup protocol was developed for ultra-performance LC (UPLC)/MS/MS determination of residues of the common aminoglycoside antibiotics streptomycin, dihydrostreptomycin, neomycin, and gentamicin in bovine milk, kidney, and muscle. Recoveries for all compounds except neomycin ranged from 80 to 104%
Yolanda Picó et al.
Analytical and bioanalytical chemistry, 407(15), 4247-4259 (2015-01-31)
The accurate determination of perfluoroalkyl substances (PFSAs) in water, sediment, fish, meat, and human milk was achieved by ultrahigh-performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UHPLC-QqTOF-MS) with an ABSciex Triple TOF®. A group of 21 PFSAs was selected as target to
Sophie Mompelat et al.
Journal of chromatography. A, 1407, 119-129 (2015-07-15)
A robust, selective and specific liquid chromatography-high resolution mass spectrometry (LC-HRMS) method was developed for the quantification of total residues of ceftiofur, an antibiotic belonging to the 3rd generation cephalosporins in plasma, muscle and kidney of poultry. Ceftiofur and conjugates
V Gellrich et al.
Chemosphere, 87(9), 1052-1056 (2012-03-07)
Perfluorinated compounds (PFCs) can be detected worldwide in both, soil and water. In order to study the leaching behavior of this heterogeneous group of compounds in soil, flow-through column experiments have been conducted. Ten perfluoro carboxylates and four perfluoro sulfonates
Karine Meisser Redeuil et al.
Journal of chromatography. A, 1422, 89-98 (2015-11-03)
This manuscript reports a validated analytical approach for the quantification of 21 water soluble vitamins and their main circulating forms in human plasma. Isotope dilution-based sample preparation consisted of protein precipitation using acidic methanol enriched with stable isotope labelled internal
A S Bhown et al.
Analytical biochemistry, 175(1), 39-51 (1988-11-15)
As an effective aid to extend the microsequencing capabilities the Beckman protein/peptide sequenator Series 890C has been successfully converted to a gas-liquid system, in which coupling buffer 25% trimethylamine was employed as a gas, and heptafluorobutyric acid as a liquid.
Péter Jankovics et al.
Journal of pharmaceutical and biomedical analysis, 112, 155-168 (2015-01-01)
The analysis of highly polar (often charged) compounds which lack a strong UV absorbing chromophore is really challenging. Despite the numerous analytical methods published, the demand for a simple, robust and cheap technique for their analysis still persists. Here, reversed
Yan He et al.
Journal of chromatography. A, 1408, 261-266 (2015-07-22)
This paper describes the use of an anionic ion-pair reagent (IPR) to impove the ultraviolet (UV) detection and hydrophobic retention of polar and UV transparent cations. Anionic IPR added to the mobile phase forms an ion-pair with cations. Formation of
Johannis P Kamerling et al.
Methods in molecular biology (Clifton, N.J.), 347, 69-91 (2006-10-31)
Over the years several methodologies have been developed for the structural analysis of naturally occurring sialic acids (Sias), a family with more than 62 members. Currently there are two primary instrumental approaches: analysis of volatile Sia derivatives by gas-liquid chromatography
J Efraim Oosterink et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 998-999, 106-113 (2015-07-22)
Methionine, homocysteine, vitamins B6, B12, B9, and their metabolites are crucial co-factors and substrates for many basic biological pathways including one-carbon metabolism, and they are particularly important for brain function and development and epigenetic mechanisms. These are essential nutrients that
Wenchun Xie et al.
Journal of chromatography. A, 1218(43), 7765-7770 (2011-09-23)
The retention behavior of an oligolysine mixture, consisting of two to eight residues, was examined at different concentrations of heptafluorobutyric acid (HFBA) in the mobile phase using a C18 column. A single ion record (SIR) mode of the mass spectrometer
Axel Möller et al.
Environmental pollution (Barking, Essex : 1987), 158(10), 3243-3250 (2010-08-10)
The concentration profile of 40 polyfluoroalkyl substances (PFAS) in surface water along the River Rhine watershed from the Lake Constance to the North Sea was investigated. The aim of the study was to investigate the influence of point as well
Eva Gorrochategui et al.
Analytica chimica acta, 854, 20-33 (2014-12-07)
A lipidomic study was developed in a human placental choriocarcinoma cell line (JEG-3) exposed to tributyltin (TBT) and to a mixture of perfluorinated chemicals (PFCs). The method was based on the application of multivariate curve resolution-alternating least squares (MCR-ALS) to
Jennifer E Foreman et al.
Toxicological sciences : an official journal of the Society of Toxicology, 110(1), 204-211 (2009-04-11)
Perfluorobutyrate (PFBA) is a short chain perfluoroalkyl carboxylate that is structurally similar to perfluorooctanoate. Administration of PFBA can cause peroxisome proliferation, induction of peroxisomal fatty acid oxidation and hepatomegaly, suggesting that PFBA activates the nuclear receptor, peroxisome proliferator-activated receptor-alpha (PPAR-alpha).
Jose Sánchez-López et al.
Plant physiology and biochemistry : PPB, 47(7), 592-598 (2009-03-24)
Polyamines are key regulators of cell development and many plant responses to environmental challenges, however, their functions still remain unclear in complex interactions with other hormones and in biotic or abiotic stress. This lack of knowledge derives from the difficulties
Jan Busch et al.
Environmental pollution (Barking, Essex : 1987), 158(5), 1467-1471 (2010-01-08)
Polyfluoroalkyl compounds (PFCs) are widely used in industry and consumer products. These products could end up finally in landfills where their leachates are a potential source for PFCs into the aqueous environment. In this study, samples of untreated and treated
J Flieger
Journal of chromatography. A, 1217(4), 540-549 (2009-12-09)
The addition of the homologous series of perfluorinated acids-trifluoroacetic acid (TFAA), pentafluoropropionic acid (PFPA), heptafluorobutyric acid (HFBA) to mobile phases for reversed-phase high-performance liquid chromatography (RP-HPLC) of beta-blockers was tested. Acidic modifiers were responsible for acidification of mobile phase (pH
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