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https://www.readbyqxmd.com/read/28441747/associations-between-diet-and-toenail-arsenic-concentration-among-pregnant-women-in-bangladesh-a-prospective-study
#1
Pi-I D Lin, Sabri Bromage, Md Golam Mostofa, Joseph Allen, Emily Oken, Molly L Kile, David C Christiani
This prospective study evaluated the relationship between long-term dietary habits and total arsenic (As) concentration in toenail clippings in a cohort of 1616 pregnant women in the Bangladeshi administrative regions of Sirajdikhan and Pabna Sadar. Diet was assessed at Gestation Week 28 and at Postpartum Month 1, using a locally-validated dish-based semi-quantitative food-frequency questionnaire. Toenail As concentration was analyzed by microwave-assisted acid digestion and inductively coupled plasma mass spectrometry...
April 23, 2017: Nutrients
https://www.readbyqxmd.com/read/28441545/targeted-mass-spectrometry-an-emerging-powerful-approach-to-unblock-the-bottleneck-in-phosphoproteomics
#2
REVIEW
Nerea Osinalde, Kerman Aloria, Miren J Omaetxebarria, Irina Kratchmarova
Following the rapid expansion of the proteomics field, the investigation of post translational modifications (PTM) has become extremely popular changing our perspective of how proteins constantly fine tune cellular functions. Reversible protein phosphorylation plays a pivotal role in virtually all biological processes in the cell and it is one the most characterized PTM up to date. During the last decade, the development of phosphoprotein/phosphopeptide enrichment strategies and mass spectrometry (MS) technology has revolutionized the field of phosphoproteomics discovering thousands of new site-specific phosphorylations and unveiling unprecedented evidence about their modulation under distinct cellular conditions...
April 17, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28441494/the-role-of-the-reducing-agent-in-the-electroless-deposition-of-copper-on-functionalized-sams
#3
Ashley Ann Ellsworth, Amy Victoria Walker
Metallized organic layer constructs have a wide range of technological applications. Electroless deposition is an attractive technique by which to deposit metal overlayers because it is inexpensive and can be performed low temperatures compatible with organic materials. Amine borane reducing agents are versatile which are capable of depositing metals, semiconductors and even insulators. We have investigated the role of amine borane reducing agents in the electroless deposition of copper on -CH3, -OH, and -COOH terminated SAMs adsorbed on gold using time-of-flight secondary ion mass spectrometry, optical microscopy and complementary MP2 calculations...
April 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28441352/high-throughput-determination-of-sodium-danshensu-in-beagle-dogs-by-the-lcms-ms-method-employing-liquid-liquid-extraction-based-on-96-well-format-plates
#4
Jingjing Jiang, Xin Zhao, Xiuxiu Li, Shengyuan Wu, Shidan Yu, Yuefen Lou, Guorong Fan
Sodium Danshensu (sodium d-(+)-β-(3,4-dihydroxyphenyl) lactate), one of the water-soluble ingredients in Salvia miltiorrhiza, exhibits potent relaxation of the coronary artery and anticoagulation effection. A high-throughput, rapid, and sensitive method combining liquid chromatography with electrospray ionization tandem mass spectrometry to determine the sodium danshensu in beagle dog plasma was developed and validated, using gallic acid as an internal standard (IS). Acidified plasma samples were extracted using 96-well liquid-liquid extraction, and were eluted on a CNW Athena C18 column (3 μm, 2...
April 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28441135/proteomic-mapping-of-cytosol-facing-outer-mitochondrial-and-er-membranes-in-living-human-cells-by-proximity-biotinylation
#5
Victoria Hung, Stephanie S Lam, Namrata D Udeshi, Tanya Svinkina, Gaelen Guzman, Vamsi K Mootha, Steven A Carr, Alice Y Ting
The cytosol-facing membranes of cellular organelles contain proteins that enable signal transduction, regulation of morphology and trafficking, protein import and export, and other specialized processes. Discovery of these proteins by traditional biochemical fractionation can be plagued with contaminants and loss of key components. Using peroxidase-mediated proximity biotinylation, we captured and identified endogenous proteins on the outer mitochondrial membrane (OMM) and endoplasmic reticulum membrane (ERM) of living human fibroblasts...
April 25, 2017: ELife
https://www.readbyqxmd.com/read/28441046/characterization-of-long-term-elution-of-platinum-from-carboplatin-impregnated-calcium-sulfate-hemihydrate-beads-in-vitro-by-two-distinct-sample-collection-methods
#6
Rachel J Tulipan, Heidi Phillips, Laura D Garrett, Levent Dirikolu, Mark A Mitchell
OBJECTIVE To characterize long-term elution of platinum from carboplatin-impregnated calcium sulfate hemihydrate (CI-CSH) beads in vitro by comparing 2 distinct sample collection methods designed to mimic 2 in vivo environments. SAMPLES 162 CI-CSH beads containing 4.6 mg of carboplatin (2.4 mg of platinum/bead). PROCEDURES For method 1, which mimicked an in vivo environment with rapid and complete fluid exchange, each of 3 plastic 10-mL conical tubes contained 3 CI-CSH beads and 5 mL of PBS solution. Eluent samples were obtained by evacuation of all fluid at 1, 2, 3, 6, 9, and 12 hours and 1, 2, 3, 6, 9, 12, 15, 18, 22, 26, and 30 days...
May 2017: American Journal of Veterinary Research
https://www.readbyqxmd.com/read/28441028/application-of-gc-ms-soft-ionization-for-isomeric-biological-compound-analysis
#7
Takeshi Furuhashi, Koji Okuda
Isomers are compounds with the same molecular formula. Many different types of isomers are ubiquitous and play important roles in living organisms. Despite their early discovery, the actual analysis of isomers has been tricky and has confounded researchers. Using mass spectrometry (MS) to distinguish or identify isomers is an emergent topic and challenge for analytical chemists. We review some techniques for analyzing isomers with emphasis on MS, e.g., the roles of ion reaction, hydrogen-deuterium exchange, ion mobility mass spectrometry, ion spectroscopy and energy change in producing isomer-specific fragments...
April 25, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28441011/synthesis-characterization-and-dft-analysis-of-bis-terpyridyl-based-molecular-cobalt-complexes
#8
Safwan Aroua, Tanya K Todorova, Paul Hommes, Lise-Marie Chamoreau, Hans-Ulrich Reissig, Victor Mougel, Marc Fontecave
Terpyridine ligands are widely used in chemistry and material sciences owing to their ability to form stable molecular complexes with a large variety of metal ions. In that context, variations of the substituents on the terpyridine ligand allow modulation of the material properties. Applying the Stille cross-coupling reaction, we prepared with good yields a new series of terpyridine ligands possessing quinoline-type moieties in ortho, meta, and para positions and dimethylamino substituents at central or distal positions...
April 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28440728/characterization-of-chemical-contaminants-generated-by-a-desktop-fused-deposition-modeling-3-dimensional-printer
#9
Aleksandr B Stefaniak, Ryan F LeBouf, Jinghai Yi, Jason Ham, Timothy Nurkewicz, Diane E Schwegler-Berry, Bean T Chen, J Raymond Wells, Matthew G Duling, Robert B Lawrence, Stephen B Martin, Alyson R Johnson, M Abbas Virji
Printing devices are known to emit chemicals into the indoor atmosphere. Understanding factors that influence release of chemical contaminants from printers is necessary to develop effective exposure assessment and control strategies. In this study, a desktop fused deposition modeling (FDM) 3-D printer using acrylonitrile butadiene styrene (ABS) or polylactic acid (PLA) filaments and two monochrome laser printers were evaluated in a 0.5 m(3) chamber. During printing, chamber air was monitored for vapors using a real-time photoionization detector (results expressed as isobutylene equivalents) to measure total volatile organic compound (TVOC) concentrations, evacuated canisters to identify specific VOCs by off-line gas chromatography-mass spectrometry (GC-MS) analysis, and liquid bubblers to identify carbonyl compounds by GC-MS...
April 25, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28440646/aqueous-reaction-of-dicarbonyls-with-ammonia-as-a-potential-source-of-organic-nitrogen-in-airborne-nanoparticles
#10
Christopher M Stangl, Murray V Johnston
Nitrogen-containing organic species such as imines and imidazoles can be formed by aqueous reactions of carbonyl-containing compounds in the presence of ammonia. In the work described here, these reactions are studied in airborne aqueous nanodroplets containing ammonium sulfate and glyoxal, methylglyoxal, or glycolaldehyde using a combination of online and offline mass spectrometry. N/C ratios attributed to the organic fraction of the particles (N/Corg) produced from glyoxal and methylglyoxal were quantified across a wide relative humidity range...
April 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28440636/probing-and-comparing-the-photobromination-and-photoiodination-of-dissolved-organic-matter-by-using-ultrahigh-resolution-mass-spectrometry
#11
Zhineng Hao, Yongguang Yin, Dong Cao, Jing-Fu Liu
Photochemical halogenation of dissolved organic matter (DOM) may represent an important abiotic source of natural organobromine compounds (OBCs) and natural organoiodine compounds (OICs) within surface waters. Here we report the significantly enhanced formation of OBCs and OICs by photohalogenating DOM in freshwater and seawater, as well as the noticeable difference in distribution and composition pattern of newly formed OBCs and OICs. By using the negative ion electrospray ionization coupled with Fourier transform ion cyclotron resonance mass spectrometry, numerous OBCs and OICs were identified during the photo halogenation processes in sunlit waters...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28440616/discovery-and-characterization-of-a-eukaryotic-initiation-factor-4a-3-selective-inhibitor-that-suppresses-nonsense-mediated-mrna-decay
#12
Misa Iwatani-Yoshihara, Masahiro Ito, Yoshihiro Ishibashi, Hideyuki Oki, Toshio Tanaka, Daisuke Morishita, Takashi Ito, Hiromichi Kimura, Yasuhiro Imaeda, Samuel A Aparicio, Atsushi Nakanishi, Tomohiro Kawamoto
Eukaryotic initiation factor 4A-3 (eIF4A3) is an Asp-Glu-Ala-Asp (DEAD) box-family adenosine triphosphate (ATP)-dependent RNA helicase. Subtypes eIF4A1 and eIF4A2 are required for translation initiation, but eIF4A3 participates in the exon junction complex (EJC) and functions in RNA metabolism including nonsense-mediated RNA decay (NMD). No small molecules for NMD inhibition via selective inhibition of eIF4A3 have been discovered. Here we identified allosteric eIF4A3 inhibitors from a high-throughput screening campaign...
April 25, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28440570/mass-spectrometric-characterization-of-the-selective-androgen-receptor-modulator-sarm-yk-11-for-doping-control-purposes
#13
Mario Thevis, Thomas Piper, Josef Dib, Andreas Lagojda, Dirk Kuehne, Lars Packschies, Hans Geyer, Wilhelm Schaenzer
RATIONALE: Selective androgen receptor modulators (SARMs) represent an emerging class of therapeutics targeting inter alia conditions referred to as cachexia and sarcopenia. Due to their anabolic properties, the use of SARMs is prohibited in sports as regulated by the World Anti-Doping Agency (WADA), and doping control laboratories test for these anabolic agents in blood and urine. In order to accomplish and maintain comprehensive test methods, the characterization of new drug candidates is critical for efficient sports drug testing...
April 25, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28440464/proteomic-profiling-of-mdx-4cv-serum-reveals-highly-elevated-levels-of-the-inflammation-induced-plasma-marker-haptoglobin-in-muscular-dystrophy
#14
Sandra Murphy, Paul Dowling, Margit Zweyer, Michael Henry, Paula Meleady, Rustam R Mundegar, Dieter Swandulla, Kay Ohlendieck
X-linked muscular dystrophy is caused by primary abnormalities in the Dmd gene and is characterized by the almost complete loss of the membrane cytoskeletal protein dystrophin, which triggers sarcolemmal instability, abnormal calcium homeostasis, increased proteolysis and impaired excitation‑contraction coupling. In addition to progressive necrosis, crucial secondary pathologies are represented by myofibrosis and the invasion of immune cells in damaged muscle fibres. In order to determine whether these substantial changes within the skeletal musculature are reflected by an altered rate of protein release into the circulatory system or other plasma fluctuations, we used label‑free mass spectrometry to characterize serum from the mdx‑4cv model of Duchenne muscular dystrophy...
April 18, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28440225/observation-of-nonanoic-acid-and-aldehydes-in-exhaled-breath-of-patients-with-lung-cancer
#15
L Callol-Sanchez, M A Munoz-Lucas, O Gomez-Martin, J A Maldonado-Sanz, C Civera-Tejuca, C Gutierrez-Ortega, G Rodriguez-Trigo, J Jareno-Esteban
Lung cancer (LC) is the leading cause of cancer death in men and the second leading cause in women worldwide. The use of low-dose computed tomography in early diagnosis was shown to reduce mortality by 20% with a median follow-up time of 6.5 years. In order to increase profitability and reduce radiation risks and costs, exhaled biomarkers could serve to help establish narrower inclusion criteria. The aim of this study was to identify new, well-founded volatile organic compounds in exhaled breath which distinguish LC patients from chronic obstructive pulmonary disease (COPD) patients and healthy subjects...
April 25, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28440070/chiral-analysis-of-amphetamines-in-hair-by-liquid-chromatography-tandem-mass-spectrometry-compliance-monitoring-of-attention-deficit-hyperactivity-disorder-adhd-patients-under-elvanse%C3%A2-therapy-and-identification-after-controlled-low-dose-application
#16
Tina M Binz, Elena Williner, Petra Strajhar, Patrick C Dolder, Matthias E Liechti, Markus R Baumgartner, Thomas Kraemer, Andrea E Steuer
Amphetamine (AMP) is used as illicit drug but also for the treatment of attention deficit hyperactivity disorder (ADHD). Respective drugs most often contain the enantiomer (S)-AMP as active compound or (S)-AMP is formed from the prodrug lisdexamfetamine (Elvanse®) whereas the illicit drug is usually traded as racemate ((R/S)-AMP). A differentiation between the use of the medically prescribed drug and the abuse of illicit street amphetamine is of great importance e.g. in retrospective consumption monitoring by hair analysis...
April 24, 2017: Drug Testing and Analysis
https://www.readbyqxmd.com/read/28440031/production-characterization-and-assessment-of-a-stable-analog-of-the-response-regulator-chey-phosphate-from-thermotoga-maritima
#17
Matthew S Beyersdorf, Ria Sircar, Daniel B Lookadoo, Cory Bottone, Michael J Lynch, Brian R Crane, Christopher J Halkides
Phosphorylation of CheY promotes association with the flagellar motor and ultimately controls the directional bias of the motor. However, biochemical studies of activated CheY-phosphate have been challenging due to the rapid hydrolysis of the aspartyl-phosphate in vitro. An inert analog of Tm CheY-phosphate, phosphono-CheY, was synthesized by chemical modification and purified by cation-exchange chromatography. Changes in HPLC retention times, chemical assays for phosphate and free thiol, and mass spectrometry experiments demonstrate modification of Cys54 with a phosphonomethyl group...
April 25, 2017: Protein Science: a Publication of the Protein Society
https://www.readbyqxmd.com/read/28439985/the-utility-of-mass-fix-to-detect-and-monitor-monoclonal-proteins-in-the-clinic
#18
Paolo Milani, David L Murray, David R Barnidge, Mindy C Kohlhagen, John R Mills, Giampaolo Merlini, Surendra Dasari, Angela Dispenzieri
The detection and quantification of monoclonal-proteins (M-proteins) are necessary for the diagnosis and evaluation of response in plasma cell dyscrasias. Immunoglobulin enrichment-coupled with matrix-assisted laser desorption ionization time-of-flight mass-spectrometry (MASS-FIX) is a simple and inexpensive method to identify M-proteins, but its clinical generalizability has not yet been elucidated. We compared MASS-FIX to protein electrophoresis (PEL), serum/urine immunofixation-electrophoresis (IFE) and quantitative serum free-light chain (FLC) for the identification of M-proteins in different clinical diagnoses...
April 25, 2017: American Journal of Hematology
https://www.readbyqxmd.com/read/28439923/immunosuppressive-drugs-in-whole-blood-validation-of-a-commercially-available-lc-ms-ms-kit-and-comparison-with-immunochemical-assays
#19
Elisa Polledri, Rosa Mercadante, Chiara Ferris Fusarin, Rita Maiavacca, Silvia Fustinoni
RATIONALE: In the determination of immunosuppressive drugs cyclosporine A (CSA), tacrolimus (TARO), sirolimus (SIRO), and everolimus (EVE) in whole blood there is an open debate about which is the best assay between immunochemistry and liquid chromatography-tandem mass spectrometry (LC-MS/MS). This work is aimed to explore this topic, focusing on the use of updated assays and the analysis of a large number of samples. METHOD: A certified in vitro diagnostic kit coupled with a medical device LC-MS/MS was validated and applied to the analysis of 1192 blood samples of patients treated with immunosuppressive drugs...
April 24, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28439867/mapping-protein-protein-interactions-using-affinity-purification-and-mass-spectrometry
#20
Chin-Mei Lee, Christopher Adamchek, Ann Feke, Dmitri A Nusinow, Joshua M Gendron
The mapping of protein-protein interaction (PPI) networks and their dynamics are crucial steps to deciphering the function of a protein and its role in cellular pathways, making it critical to have comprehensive knowledge of a protein's interactome. Advances in affinity purification and mass spectrometry technology (AP-MS) have provided a powerful and unbiased method to capture higher-order protein complexes and decipher dynamic PPIs. However, the unbiased calling of nonspecific interactions and the ability to detect transient interactions remains challenging when using AP-MS, thereby hampering the detection of biologically meaningful complexes...
2017: Methods in Molecular Biology
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