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Rapid Communications in Mass Spectrometry: RCM

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https://www.readbyqxmd.com/read/28636125/forensic-application-of-stable-isotope-delta-values-proposed-minimum-requirements-for-method-validation
#1
LETTER
Philip J H Dunn, Helen Salouros, James F Carter, Sean P Doyle
No abstract text is available yet for this article.
June 21, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28621444/implementation-of-electron-induced-dissociation-mass-spectrometry-technique-for-differentiation-of-isomeric-metabolites-of-diclofenac
#2
LETTER
Zhidan Liang, Zhoupeng Zhang, Jeremy J Wolff, Christopher J Thompson, Wendy Zhong
No abstract text is available yet for this article.
June 16, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28600869/follow-up-on-the-characterization-of-peptidic-markers-in-hair-and-fur-for-the-identification-of-common-north-american-species
#3
Caroline Solazzo
RATIONALE: Species identification of hair is routinely done by microscopic analysis. Following previous studies that used protein analysis to characterize species markers in hair and wool, the present work aims at covering a larger number of species and to ultimately offer a method for rapid hair identification in forensics and archaeology. METHODS: Hair is mostly made of alpha-keratins; these proteins have only been sequenced in a handful of species and most animal families are under-represented...
June 10, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28590551/ozone-induced-dissociation-on-a-traveling-wave-high-resolution-mass-spectrometer-for-determination-of-double-bond-position-in-lipids
#4
Ngoc Vu, Jeffery Brown, Kevin Giles, Qibin Zhang
RATIONALE: The position of C=C within fatty acyl chains affects the biological function of lipids. Ozone induced dissociation-mass spectrometry (OzID-MS) has great potential in determination of lipid double bond position, but has only been implemented on low resolution ion trap mass spectrometers. In addition, most of the OzID-MS experiments carried out so far were focused on the sodiated adducts of lipids, fragmentation of the most commonly observed protonated ions generated in LC-MS based lipidomics workflow has been less explored...
June 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28590526/gas-phase-fragmentation-of-1-adamantylbisimidazolium-salts-and-their-complexes-with-cucurbit-7-uril-studied-using-selectively-2-h-labeled-guest-molecules
#5
Andrea Čablová, Michal Rouchal, Barbora Hanulíková, Jan Vícha, Lenka Dastychová, Zdeňka Prucková, Robert Vícha
RATIONALE: Bisimidazolium salts (BIMs) represent an interesting family of ditopic ligands that are used in the construction of supramolecular systems with hosts based on cyclodextrins or cucurbit[n]urils. Understanding the fragmentation mechanism of individual BIMs and how this mechanism changes after complexation with cucurbit[n]urils can bring new insight into the intrinsic host-guest relationship, thereby allowing utilization of mass spectrometry to describe binding behavior. METHODS: Selectively (2) H-labeled bisimidazolium salts were prepared and fully characterized by spectroscopic methods...
June 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28590512/tissue-specific-turnover-and-diet-tissue-discrimination-factors-of-carbon-and-nitrogen-isotopes-of-a-common-forage-fish-held-at-two-temperatures
#6
S F Colborne, A T Fisk, T B Johnson
RATIONALE: The application of stable isotopes to foraging ecology is dependent on understanding life-history and environmental factors unrelated to diet that may influence isotopic composition. Diet-tissue discrimination factors (DTDFs) and turnover rates will increase the accuracy of isotope-based studies. Furthermore, little consideration has been given to the effects of temperature or life-history stage on isotopic ratios despite the prevalence of variation in temperature and growth rates throughout life...
June 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28586540/quantification-and-risk-assessment-of-organic-products-resulting-from-non-thermal-plasma-removal-of-toluene-in-nitrogen
#7
Teng Guo, Xubing Du, Zhen Peng, Li Xu, Junguo Dong, Jianquan Li, Ping Cheng, Zhen Zhou
RATIONALE: Non-thermal plasma (NTP) has proven to be an effective approach to volatile organic compounds (VOCs) removal. However, harmful organic by-products, produced during NTP-mediated removal of VOCs, hinder practical applications of this technology. It is necessary to characterize the organic by-products to assess their health risks. METHODS: A method is proposed for analyzing and evaluating organic by-products for NTP-mediated removal of VOCs in this work...
June 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28586533/characterization-of-rapid-extraction-protocols-for-high-throughput-metabolomics
#8
Sarah Gehrke, Julie A Reisz, Travis Nemkov, Kirk C Hansen, Angelo D'Alessandro
RATIONALE: In the last five years, high throughput metabolomics has significantly advanced scientific research and holds the potential to promote strides in the fields of clinical metabolomics and personalized medicine. While innovations in the field of flow-injection mass spectrometry and three-minute metabolomics methods now allow investigators to process hundreds to thousands of samples per day, time-sensitive clinical applications, particularly in the emergency department, are limited by a lack of rapid extraction methods...
June 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28582796/relative-molar-response-of-lipophilic-marine-algal-toxins-in-liquid-chromatography-electrospray-ionization-mass-spectrometry
#9
Zita Zendong, Manoella Sibat, Christine Herrenknecht, Philipp Hess, Pearse McCarron
RATIONALE: Accurate quantitative analysis of lipophilic toxins by liquid chromatography-mass spectrometry (LC-MS) requires calibration solution reference materials (RMs) for individual toxin analogs. Untargeted analysis is aimed at identifying a vast number of compounds and thus validation of fully quantitative untargeted methods is not feasible. However, a semi-quantitative approach allowing for profiling is still required and will be strengthened by knowledge of the relative molar response (RMR) of analogs in liquid chromatography-mass spectrometry (LC-MS) with electrospray ionization (ESI)...
June 5, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28569011/insourcerer-a-high-throughput-method-to-search-for-unknown-metabolite-modifications-by-mass-spectrometry
#10
Aida Mrzic, Frederik Lermyte, Trung Nghia Vu, Dirk Valkenborg, Kris Laukens
RATIONALE: Using mass spectrometry, the analysis of known metabolite structures has become feasible in a systematic high-throughput fashion. Nevertheless, the identification of previously unknown structures remains challenging, partially because many unidentified variants originate from known molecules that underwent unexpected modifications. Here, we present a method for the discovery of unknown metabolite modifications and conjugate metabolite isoforms in a high-throughput fashion. METHODS: The method is based on user controlled in-source fragmentation which is used to induce loss of weakly bound modifications...
June 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28558170/collision-induced-dissociation-of-phenethylamides-role-of-ion-neutral-complex
#11
Dejan Nikolić, Carmen Macias, David C Lankin, Richard B van Breemen
RATIONALE: Phenethylamides are a large group of naturally occurring molecules found both in the plant and animal kingdoms. In addition, they are used as intermediates for the synthesis of pharmaceutically important dihydro- and tetrahydroisoquinolines. To enable efficient characterization of this class of molecules, a detailed mass spectrometric fragmentation study of a broad series of analogs was carried out. METHODS: The test compounds were synthesized using standard methods for amide bond formation...
May 30, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28557149/a-qualitative-and-quantitative-evaluation-of-the-peptide-characteristics-of-microwave-and-ultrasound-assisted-digestion-in-discovery-and-targeted-proteomic-analyses
#12
Zhengguang Guo, Jie Cheng, Haidan Sun, Wei Sun
RATIONALE: Fast digestion methods can dramatically accelerate enzyme digestion and increase the throughput of proteomic analysis. However, the peptide characteristics of fast digestion methods and their performance in discovery and targeted proteomic analysis must be systematically evaluated. METHODS: Three digestion methods, including overnight digestion, microwave-assisted protein enzymatic digestion (MAPED), and high-intensity focused ultrasonic-assisted enzymatic digestion (HIFUSAED), in trypsin or in trypsin/Lys-C were comprehensively compared in both discovery and targeted proteomics analysis using theHeLa cell proteome...
May 30, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28557104/large-variability-of-co2-and-n2-o-emissions-and-of-15-n-site-preference-of-n2-o-from-reactions-of-nitrite-with-lignin-and-its-derivatives-at-different-ph
#13
Jing Wei, Minghua Zhou, Harry Vereecken, Nicolas Brüggemann
RATIONALE: Chemodenitrification is an important N2 O source in soil; however, knowledge about the production of CO2 and N2 O from abiotic nitrite-SOM reactions, especially the N2 O isotopic signatures (intramolecular (15) N site preference (SP), and δ(15) N(bulk) and δ(18) O values) is quite limited at present. METHODS: N2 O and CO2 emissions from chemical reactions of nitrite with lignin products were determined with gas chromatography, and their response surfaces as a function of pH from 3 to 6 and nitrite concentration from 0...
May 29, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28557057/unraveling-complex-molecular-transformations-of-n-%C3%AE-alanyldopamine-that-accounts-for-brown-coloration-of-insect-cuticle
#14
Hanine Barek, Jason Evans, Manickam Sugumaran
RATIONALE: N-β-alanyldopamine (NBAD) and N-acetyldopamine (NADA) are catecholamines that are used by insects as sclerotizing precursors for hardening of their cuticle. They share a common pathway utilizing the same set of sclerotizing enzymes. Yet, cuticles using NBAD are brown, while cuticles using NADA are colorless. To identify the cause of this major unresolved color difference, molecular transformations of NBAD with cuticular enzymes were investigated. METHODS: Reactions of NBAD and NADA with native cuticle isolated from the wandering stages of Sarcophaga bullata larvae as well as the reactions of NBAD with cuticular sclerotization enzymes - phenoloxidase, quinone isomerase and quinone methide isomerase - were investigated using UV-Vis spectroscopy, HPLC, and mass spectrometry...
May 29, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28556307/evaluation-of-peroxidative-stress-of-cancer-cells-in-vitro-by-real-time-quantification-of-volatile-aldehydes-in-culture-headspace
#15
Violetta Shestivska, Abigail V Rutter, Josep Sulé-Suso, David Smith, Patrik Spanel
RATIONALE: Peroxidation of lipids in cellular membranes results in the release of volatile organic compounds (VOCs), including saturated aldehydes. The real-time quantification of trace VOCs produced by cancer cells during peroxidative stress presents a new challenge to non-invasive clinical diagnostics, which we have met with some success, as described in this paper. METHODS: A combination of selected ion flow tube mass spectrometry (SIFT-MS), a technique that allows rapid, reliable quantification of VOCs in humid air and liquid headspace, and electrochemistry to generate reactive oxygen species (ROS) in vitro has been used...
May 27, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28556299/use-of-oxygen-isotopes-to-differentiate-between-nitrous-oxide-produced-by-fungi-or-bacteria-during-denitrification
#16
Lena Rohe, Reinhard Well, Dominika Lewicka-Szczebak
RATIONALE: Fungal denitrifiers can contribute substantially to N2 O emissions from arable soil and show a distinct site preference for N2 O (SP(N2 O)). This study sought to identify another process-specific isotopic tool to improve precise identification of N2 O of fungal origin by mass spectrometric analysis of the N2 O produced. METHODS: Three pure bacterial and three fungal species were incubated under denitrifying conditions in treatments with natural abundance and stable isotope labelling to analyse the N2 O produced...
May 27, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28556266/identification-of-stress-degradation-products-of-iloperidone-using-liquid-chromatography-coupled-with-orbitrap-mass-spectrometer
#17
Sukanya Pandeti, Tofan Kumar Rout, T Narender, Thota Jagadeshwar Reddy
RATIONALE: Iloperidone (ILOP) is atypical antipsychotic drug used for the treatment of schizophrenia and related psychotic disorders. Comprehensive stress testing of ILOP drug was carried out as per ICH guidelines to understand the degradation profile of the drug. The presence of degradation products in a drug affects not only the quality, but also the safety and efficacy of drug formulation. Thus, it is essential to develop an efficient analytical method which could be useful for the separation, identification and characterization of all possible degradation products of ILOP...
May 26, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28548314/scorpionate-complexes-of-aza-18-crown-6-containing-fluoronitrophenyl-substituents-as-studied-by-esi-ms
#18
Rafał Frański, Magdalena Onyszkiewicz, Błażej Gierczyk
RATIONALE: Coordination of a metal cation by a nitro group is rare and the interaction between them is usually weak. Examples of complexes in which such an interaction takes place are metal complexes of cyclams containing nitrophenyl or nitrobenzyl substituents. It seemed to be interesting to check if in the complexes of respective crown ether conjugates the interaction can also take place. METHODS: We synthesized the respective conjugates of aza-18-crown-6, namely fluoro-substituted N-nitrophenylaza-18C6 conjugates...
May 26, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28523846/a-novel-rapid-analysis-using-mass-spectrometry-to-evaluate-downstream-refolding-of-recombinant-human-insulin-like-growth-factor-1-mecasermin
#19
Kenichiro Furuki, Toshimasa Toyo'oka, Hideto Yamaguchi
RATIONALE: Mecasermin is used to treat elevated blood sugar as well as growth hormone-resistant Laron-type dwarfism. Mecasermin isolated from inclusion bodies in extracts of E.coli must be refolded to acquire sufficient activity. However, there is no rapid analytical method for monitoring refolding during the purification process. METHODS: We prepared mecasermin drug product, in-process samples during the oxidation of mecasermin, forced-reduced mecasermin, and aerially oxidized mecasermin after forced reduction...
May 19, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28514513/comprehensive-database-of-manufactured-gas-plant-tars-part-c-heterocyclic-and-hydroxylated-pahs
#20
Christopher Gallacher, Russell Thomas, Richard Lord, Robert M Kalin, Chris Taylor
RATIONALE: Coal tars are a mixture of organic and inorganic compounds and were by-products from the manufactured gas and coke making industries. The tar compositions varied depending on many factors such as the temperature of production and the type of retort used. For this reason a comprehensive database of the compounds found in different tar types is of value to understand both how their compositions differ and what potential chemical hazards are present. This study focuses on the heterocyclic and hydroxylated compounds present in a database produced from 16 different tars from 5 different production processes...
May 17, 2017: Rapid Communications in Mass Spectrometry: RCM
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