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Liquid Chromatography tandem mass spectrometry

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https://www.readbyqxmd.com/read/29145436/scrambled-eggs-proteomic-portraits-and-novel-biomarkers-of-egg-quality-in-zebrafish-danio-rerio
#1
Ozlem Yilmaz, Amélie Patinote, Thao Vi Nguyen, Emmanuelle Com, Regis Lavigne, Charles Pineau, Craig V Sullivan, Julien Bobe
Egg quality is a complex biological trait and a major determinant of reproductive fitness in all animals. This study delivered the first proteomic portraits of egg quality in zebrafish, a leading biomedical model for early development. Egg batches of good and poor quality, evidenced by embryo survival for 24 h, were sampled immediately after spawning and used to create pooled or replicated sample sets whose protein extracts were subjected to different levels of fractionation before liquid chromatography and tandem mass spectrometry...
2017: PloS One
https://www.readbyqxmd.com/read/29145135/forced-and-long-term-degradation-assays-of-tenoxicam-piroxicam-and-meloxicam-in-river-water-degradation-products-and-adsorption-to-sediment
#2
Juan J Jiménez, Beatriz E Muñoz, María I Sánchez, Rafael Pardo
The fate of the pharmaceutical drugs tenoxicam, piroxicam and meloxicam in river water is evaluated here for first time. So, biological, photochemical and thermal degradation assays have been conducted to estimate their degradation rates and know their degradation products. Results indicated that the direct sunlight irradiation, without any protection, promoted a fast degradation of the oxicams while the chemical reactions in solution were less important. The biological degradation in water was negligible except for tenoxicam in whose case its influence was scarce...
October 25, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145087/retention-performance-of-three-widely-used-spe-sorbents-for-the-extraction-of-perfluoroalkyl-substances-from-seawater
#3
Miroslav Brumovský, Jitka Bečanová, Pavlína Karásková, Luca Nizzetto
Some per- and polyfluoroalkyl substances (PFASs) have been detected ubiquitously in the environment. Owing to the polar character conferred by the presence of the carboxylic or sulfonic acid groups and their resistance to degradation, aquatic environments became their major reservoirs, including marine waters. The procedure of PFAS analysis in aqueous matrices consists usually of solid-phase extraction (SPE) followed by high-performance liquid chromatography coupled to tandem mass spectrometry. Moreover, passive sampling approach using various SPE sorbents may be applied...
November 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/29145026/lc-ms-ms-quantification-of-felinine-metabolites-in-tissues-fluids-and-excretions-from-the-domestic-cat-felis-catus
#4
Ayami Futsuta, Wataru Hojo, Tamako Miyazaki, Tetsuro Yamashita, Masao Miyazaki
Domestic cat urine contains large concentrations of the unusual amino acid, felinine (2-amino-7-hydroxy-5,5-dimethyl-4-thiaheptanoic acid). A felinine derivative, 3-mercapt-3-methylbutanol is a potential scent signal for letting other animals know that the scent owners are cats. 3-Methylbutanol-glutathione (MBG) is an upstream precursor of the biosynthetic pathway of felinine that may be produced in hepatocytes by conjugation of glutathione with isopentenyl pyrophosphate, an intermediate for cholesterol biosynthesis...
November 6, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29145024/direct-analysis-of-ethylene-glycol-in-human-serum-on-the-basis-of-analyte-adduct-formation-and-liquid-chromatography-tandem-mass-spectrometry
#5
Marek Dziadosz
The aim of this work was to develop a fast, cost-effective and time-saving liquid chromatography-tandem mass spectrometry (LC-MS/MS) analytical method for the analysis of ethylene glycol (EG) in human serum. For these purposes, the formation/fragmentation of an EG adduct ion with sodium and sodium acetate was applied in the positive electrospray mode for signal detection. Adduct identification was performed with appropriate infusion experiments based on analyte solutions prepared in different concentrations...
November 12, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/29144822/testosterone-levels-achieved-by-medically-treated-transgender-women-in-a-united-states-endocrinology-clinic-cohort
#6
Jennifer J Liang, Divya Jolly, Kelly J Chan, Joshua D Safer
OBJECTIVE: Most transgender women depend on medical treatment alone to lower testosterone levels in order to align physical appearance with gender identity. The medical regimen in the United States typically includes spironolactone and estrogens. The purpose of this cross-sectional study was to assess the testosterone suppression achieved among transgender women treated with spironolactone and estrogens. METHODS: Testosterone and estradiol levels were extracted from the electronic medical records of 98 anonymized transgender women treated with oral spironolactone and oral estrogen therapy at the Endocrinology Clinic at Boston Medical Center...
November 16, 2017: Endocrine Practice
https://www.readbyqxmd.com/read/29144587/characterization-of-complex-heterogeneous-lipid-a-samples-using-hplc-ms-ms-technique-iii-positive-ion-mode-tandem-mass-spectrometry-to-reveal-phosphorylation-and-acylation-patterns-of-lipid-a
#7
Viktor Sándor, Anikó Kilár, Ferenc Kilár, Béla Kocsis, Ágnes Dörnyei
In this study, we report the detailed analysis of the fragmentation patterns of positively charged lipid A species based on their tandem mass spectra obtained under low-energy collision-induced dissociation conditions of an electrospray quadrupole time-of-flight mass spectrometers. The tandem mass spectrometry experiments were performed after the separation of the compounds with a reversed-phase high performance liquid chromatography method. We found that both, phosphorylated and nonphosphorylated lipid A molecules can be readily ionized in the positive-ion mode by adduct formation with triethylamine added to the eluent...
November 16, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29144552/simultaneous-determination-of-tilianin-and-its-metabolites-in-mice-using-ultra-high-performance-liquid-chromatography-with-tandem-mass-spectrometry-and-its-application-to-a-pharmacokinetic-study
#8
Liping Wang, Qingwei Chen, Lijun Zhu, Xuejun Zeng, Qiang Li, Ming Hu, Xinchun Wang, Zhongqiu Liu
Tilianin is an active flavonoid glycoside found in many medical plants. Data are lacking regarding its pharmacokinetics and disposition in vivo. The objective of this study was to develop a sensitive, reliable, and validated ultra-high-performance liquid chromatography with tandem mass spectrometry (UHPLC-MS/MS) method to simultaneously quantify tilianin and its main metabolites and to determine its pharmacokinetics in wild-type and breast cancer resistance protein knockout (Bcrp1-/-) FVB mice. Chromatographic separation was accomplished on a C18 column by utilizing acetonitrile and 0...
November 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29143972/determination-of-tubuloside-b-by-lc-ms-ms-and-its-application-to-a-pharmacokinetic-study-in-rats
#9
Shenbao Yang, Ruiying Qu, Peilu Sun, Shan Xiong, Siyi Yan, Zhipeng Deng
Tubuloside B, a novel neuroprotective phenylethanoid, is a major active constituent of Cistanche tubulosa and Cistanche deserticola. A specific and sensitive liquid chromatography tandem mass spectrometry (LC-MS/MS) method has been developed and validated for the quantification of tubuloside B in rat plasma. Sample preparation was conducted through a protein-precipitation extraction with methanol using tubuloside A as internal standard (IS). Chromatographic separation was achieved by using a Capcell Pak C18 column (2...
November 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29143853/sex-specific-risk-assessment-of-pfhxs-using-a-physiologically-based-pharmacokinetic-model
#10
Sook-Jin Kim, Hwajin Shin, Yong-Bok Lee, Hea-Young Cho
Perfluorohexanesulfonate (PFHxS), which belongs to the group of perfluoroalkyl and polyfluoroalkyl substances (PFASs), has been extensively used in industry and subsequently detected in the environment. Its use may be problematic, as PFHxS is known to induce neuronal cell death, and has been associated with early onset menopause in women and with attention deficit/hyperactivity disorder. Due to these impending issues, the aim of this study is to develop and evaluate a physiologically based pharmacokinetic (PBPK) model for PFHxS in male and female rats, and apply this to a human health risk assessment...
November 16, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/29142973/renal-amyloidosis-associated-with-5-novel%C3%A2-variants-in-the-fibrinogen-a-alpha-chain-protein
#11
Dorota Rowczenio, Maria Stensland, Gustavo A de Souza, Erik H Strøm, Janet A Gilbertson, Graham Taylor, Nigel Rendell, Shane Minogue, Yvonne A Efebera, Helen J Lachmann, Ashutosh D Wechalekar, Philip N Hawkins, Ketil R Heimdal, Kristian Selvig, Inger K Lægreid, Nathalie Demoulin, Selda Aydin, Julian D Gillmore, Tale N Wien
Introduction: Fibrinogen A alpha chain amyloidosis is an autosomal dominant disease associated with mutations in the fibrinogen A alpha chain (FGA) gene, and it is the most common cause of hereditary renal amyloidosis in the UK. Patients typically present with kidney impairment and progress to end-stage renal disease over a median time of 4.6 years. Methods: Six patients presented with proteinuria, hypertension, and/or lower limb edema and underwent detailed clinical and laboratory investigations...
May 2017: KI Reports
https://www.readbyqxmd.com/read/29142508/proteomic-characterisation-of-bovine-and-avian-purified-protein-derivatives-and-identification-of-specific-antigens-for-serodiagnosis-of-bovine-tuberculosis
#12
José Antonio Infantes-Lorenzo, Inmaculada Moreno, María de Los Ángeles Risalde, Álvaro Roy, Margarita Villar, Beatriz Romero, Nieves Ibarrola, José de la Fuente, Eugenia Puentes, Lucía de Juan, Christian Gortázar, Javier Bezos, Lucas Domínguez, Mercedes Domínguez
Background: Bovine purified protein derivative (bPPD) and avian purified protein derivative (aPPD) are widely used for bovine tuberculosis diagnosis. However, little is known about their qualitative and quantitative characteristics, which makes their standardisation difficult. In addition, bPPD can give false-positive tuberculosis results because of sequence homology between Mycobacterium bovis (M. bovis) and M. avium proteins. Thus, the objective of this study was to carry out a proteomic characterisation of bPPD, aPPD and an immunopurified subcomplex from bPPD called P22 in order to identify proteins contributing to cross-reactivity among these three products in tuberculosis diagnosis...
2017: Clinical Proteomics
https://www.readbyqxmd.com/read/29142051/improved-detection-of-her2-by-a-quasi-targeted-proteomics-approach-using-aptamer-peptide-probe-and-liquid-chromatography-tandem-mass-spectrometry
#13
Weixian Zhou, Feifei Xu, Danni Li, Yun Chen
BACKGROUND: Human epidermal growth factor receptor 2 (HER2)-positive breast cancer is a particularly aggressive type of the disease. To date, much evidence has indicated that accurate HER2 status detection is crucial for prognosis and treatment strategy selection. Thus, bioanalytical techniques for early and accurate detection of HER2 have the potential to improve patient care. Currently, the widely used immunohistochemical staining normally has problems with reproducibility and lack of standardization, resulting in poor concordance between laboratories...
November 15, 2017: Clinical Chemistry
https://www.readbyqxmd.com/read/29141708/sensitive-detection-of-neonicotinoid-insecticides-and-other-selected-pesticides-in-pollen-and-nectar-using-nanoflow-liquid-chromatography-orbitrap-tandem-mass-spectrometry
#14
David Moreno-González, Jaime Alcántara-Durán, Bienvenida Gilbert-López, Miriam Beneito-Cambra, Víctor M Cutillas, Łukasz Rajski, Antonio Molina-Díaz, Juan F García-Reyes
In this work, a new method based on nanoflow LC with high-resolution MS was developed for the determination ofeight pesticides in pollen and nectar samples, including neonicotinoid insecticides and other selected pesticides commonly found in bees and beeswax. Detection was undertaken with a hybrid quadrupole-Orbitrap mass spectrometer (Q Exactive™) equipped with a commercial nanospray ion source. The extraction of pesticides from pollen samples was performed by a modified micro-QuEChERS method scaled down to Eppendorf tubes, whereas nectar samples were simply diluted with a water–methanol (95 + 5, v/v) solution...
November 15, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29141195/determination-of-the-effect-of-pinellia-ternata-thunb-breit-on-nervous-system-development-by-proteomics
#15
Jian-Ya Xu, Chen Dai, Jin-Jun Shan, Tong Xie, Hui-Hui Xie, Ming-Ming Wang, Guang Yang
ETHNOPHARMACOLOGICAL RELEVANCE: Banxia (BX) is the dried tuber of Pinellia ternata (Thunb.) Breit., a commonly prescribed Chinese medicinal herb for the treatment of cough, phlegm, and vomiting in pregnant women. However, raw BX has been demonstrated to exert toxic effects on reproduction and the precise and comprehensive mechanisms remain elusive. AIM OF THE STUDY: We applied an iTRAQ (isobaric tags for relative and absolute quantitation, iTRAQ)-based proteomic method to explore the mechanisms of raw BX-induced fetal toxicity in mice...
November 12, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29140712/high-expression-of-ugt1a1-1a6-in-monkey-small-intestine-comparison-of-protein-expression-levels-of-cytochromes-p450-udp-glucuronosyltransferases-and-transporters-in-small-intestine-of-cynomolgus-monkey-and-human
#16
Takanori Akazawa, Yasuo Uchida, Eisuke Miyauchi, Masanori Tachikawa, Sumio Ohtsuki, Tetsuya Terasaki
Cynomolgus monkeys have been widely used for the prediction of drug absorption in humans. The purpose of this study was to clarify the regional protein expression levels of cytochromes P450 (CYPs), UDP-glucuronosyltransferases (UGTs), and transporters in small intestine of cynomolgus monkey using liquid chromatography-tandem mass spectrometry, and to compare them with the corresponding levels in human. UGT1A1 in jejunum and ileum were >4.57- and >3.11-fold, and UGT1A6 in jejunum and ileum were >16...
November 15, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29137711/novel-free-radical-mediated-lipid-peroxidation-biomarkers-in-newborn-plasma
#17
Ángel Sánchez-Illana, Sudhin Thayyil, Paolo Montaldo, Dorothea Jenkins, Guillermo Quintás, Camille Oger, Jean-Marie Galano, Claire Vigor, Thierry Durand, Máximo Vento, Julia Kuligowski
Oxidative stress derived from perinatal asphyxia appears to be closely linked to neonatal brain damage and lipid peroxidation biomarkers have shown to provide predictive power of oxidative stress related pathologies in situations of hypoxia and reoxygenation in the newborn. The objective of this work was to develop and validate of a comprehensive liquid chromatography tandem mass spectrometry approach for the quantitative profiling of 28 isoprostanoids in newborn plasma samples covering a broad range of lipid peroxidation product classes...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29137699/determination-of-sulfite-in-food-by-liquid-chromatography-tandem-mass-spectrometry-collaborative-study
#18
Katherine S Carlos, Lowri S de Jager
Sulfites are added to a wide range of food and beverage products to prevent browning or oxidation. Although most of the population do not experience side effects from consuming sulfites, a small subset has been shown to experience an "allergic-like" response. For this reason, the U.S. Food and Drug Administration requires that sulfites be labeled on all products that contain more than 10 mg/kg (parts per million) sulfur dioxide. The current regulatory method, optimized Monier-Williams (OMW) Official Method 990...
November 1, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29137297/probably-less-than-one-tenth-of-the-genes-produce-only-the-wild-type-protein-without-at-least-one-additional-protein-isoform-in-some-human-cancer-cell-lines
#19
Rui Yan, Ju Zhang, Lucas Zellmer, Lichan Chen, Di Wu, Siqi Liu, Ningzhi Xu, Joshua D Liao
To estimate how many genes produce multiple protein isoforms, we electrophoresed proteins from MCF7 and MDA-MB231 (MB231) human breast cancer cells in SDS-PAGE and excised narrow stripes of the gel at the 48kD, 55kD and 72kD. Proteins in these stripes were identified using liquid chromatography and tandem mass spectrometry. A total of 765, 750 and 679 proteins from MB231 cells, as well as 470, 390 and 490 proteins from MCF7 cells, were identified from the 48kD, 55kD and 72kD stripes, respectively. We arbitrarily allowed a 10% technical variation from the proteins' theoretical molecular mass (TMM) and considered those proteins with their TMMs within the 43-53 kD, 49-61 kD and 65-79 kD ranges as the wild type (WT) expected from the corresponding stripe, whereas those with a TMM above or below this range as a smaller- or larger-group, respectively...
October 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29136901/biomarker-analysis-of-hemoglobin-adducts-of-acrylamide-and-glycidamide-enantiomers-for-mid-term-internal-exposure-assessment-by-isotope-dilution-ultra-high-performance-liquid-chromatography-tandem-mass-spectrometry
#20
Yu Zhang, Qiao Wang, Gong Zhang, Wei Jia, Yiping Ren, Yongning Wu
Hemoglobin (Hb) adducts of acrylamide (AA) and its oxidative metabolite glycidamide (GA) are important biomarkers for evaluating the mid-term exposure of acrylamide toxicity in vivo. Taking pentafluoro-2-methylphenyl isothiocyanates of N-(2-carbamoylethyl)valine (AAVal-PFPTH) and N-(2-carbamoyl-2-hydroxyethy)valine (GAVal-PFPTH) as target analytes, we developed an isotope dilution ultra-high performance liquid chromatograph tandem mass spectrometry (UHPLC-MS/MS) method for the simultaneous determination of AA and GA hemoglobin (Hb) adducts under the electroscopy ionization negative (ESI‾) mode in the present work...
February 1, 2018: Talanta
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