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Rapid Communications in Mass Spectrometry: RCM

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https://www.readbyqxmd.com/read/28708331/negative-chemical-ionization-gas-chromatography-mass-spectrometry-of-transfluthrin-in-rat-plasma-and-brain
#1
Shirin Hooshfar, Tanzir B Mortuza, Clinton A Rogers, Michael R Linzey, Darren R Gullick, James V Bruckner, Catherine A White, Michael G Bartlett
RATIONALE: Transfluthrin is a relatively non-toxic rapid-acting synthetic pyrethroid insecticide. It is widely used in household and hygiene products. A sensitive and accurate bioanalytical method is required for quantification of its concentration in plasma and its potential target organ, the brain for studies to assess its health effects and toxicokinetics in mammals. METHODS: The samples were prepared by liquid-liquid extraction. Gas chromatography mass spectrometry (GC/MS) analysis was performed for the determination of transfluthrin in biological samples with an overall method run time of 15 min...
July 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28703318/ft-artifacts-and-power-function-resolution-filter-in-fourier-transform-mass-spectrometry
#2
Basem Kanawati, Theresa Bader, Karl-Peter Wanczek, Yan Li, Philippe Schmitt-Kopplin
RATIONALE: Peak picking algorithms in mass spectrometry face the challenge of picking the correct signals from a mass spectrum. In some cases signal wiggles (side lobes) are also chosen in the produced mass list as if they were real signals. Constraints which are defined in such algorithms do not always guarantee wiggle free accurate mass list generation out of raw mass spectra. This problem intensifies with acquisitions, which are accompanied with longer transients. Thus, the problem represents a contemporary issue, which propagates with modern high memory digitizers and exists in both MS and MS/MS spectra...
July 13, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28700111/isotopic-homogeneity-throughout-the-skin-in-small-cetaceans
#3
Marina Arregui, Marta Josa, Alex Aguilar, Asunción Borrell
RATIONALE: Isotope ratios from skin samples have been widely used to study cetacean trophic ecology. Usually, isotopic skin uniformity has been assumed, despite the heterogeneity of this tissue. This study aims to investigate 1) regional isotopic variation within the skin in cetaceans, and 2) isotopic variation among internal tissues. METHODS: Stable carbon (δ(13) C values) and nitrogen (δ(15) N values) isotope ratios were measured in 11 skin positions in 10 common dolphins (Delphinus delphis) and 9 striped dolphins (Stenella coeruleoalba)...
July 12, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28700098/comparison-of-species-classification-models-of-mass-spectrometry-data-kernel-discriminant-analysis-vs-random-forest-a-case-study-of-afrormosia-pericopsis-elata-harms-meeuwen
#4
V Deklerck, K Finch, P Gasson, J Van den Bulcke, J Van Acker, H Beeckman, E Espinoza
RATIONALE: The genus Pericopsis includes four tree species of which only Pericopsis elata (Harms) Meeuwen is of commercial interest. Enforcement officers might have difficulties discerning this CITES-listed species from some other tropical African timber species. Therefore, we tested several methods to separate and identify these species rapidly in order to enable customs officials to uncover illegal trade. In this study, two classification methods using DART TOFMS data to discern between several species are presented...
July 12, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28696545/determination-of-uranium-isotope-ratios-using-a-liquid-sampling-atmospheric-pressure-glow-discharge-orbitrap-mass-spectrometer-system
#5
Edward D Hoegg, R Kenneth Marcus, David W Koppenaal, Jan Irvahn, George J Hager, Garret L Hart
RATIONALE: The field of highly accurate and precise isotope ratio analysis, for use in nonproliferation, has been dominated by thermal ionization and inductively coupled plasma mass spectrometry. While these techniques are considered the gold standard for isotope ratio analysis, a downsized instrument capable of accurately and precisely measuring U isotope ratios is desirable for field studies or in laboratories with limited infrastructure. METHODS: The developed system interfaces the liquid sampling, an atmospheric pressure glow discharge (LS-APGD) ion source, with a high resolution Exactive Orbitrap mass spectrometer...
July 11, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28696517/warm-season-precipitation-signal-in-%C3%AE-2-h-values-of-wood-lignin-methoxyl-groups-from-high-elevation-larch-trees-in-switzerland
#6
Dana F C Riechelmann, Markus Greule, Rolf T W Siegwolf, Tobias Anhäuser, Jan Esper, Frank Keppler
RATIONALE: In this study, we tested stable hydrogen isotope ratios of wood lignin methoxyl groups (δ (2) Hmethoxyl values) as a palaeoclimate proxy in dendrochronology. This is a quite new method in the field of dendrochronology and the sample preparation is much simpler than the methods used before to measure δ(2) H values from wood. METHODS: We measured δ (2) Hmethoxyl values in high elevation larch trees (Larix decidua Mill.) from Simplon Valley (southern Switzerland)...
July 11, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28696018/high-resolution-mass-spectrometric-analysis-of-myo-inositol-hexakisphosphate-using-electrospray-ionisation-orbitrap
#7
Catherine A McIntyre, Christopher J Arthur, Richard P Evershed
RATIONALE: The phosphorus storage compound in grains, phytic acid, or myo-inositol hexakisphosphate (IP6), is important for nutrition and human health, and is the most abundant organic phosphorus compound in soils. Methods for its determination have traditionally relied on complexation with iron and precipitation, acid digestion and measurement of phosphate concentration, or (31) P NMR spectroscopy. Direct determination of phytic acid (and its homologues) using mass spectrometry has, as yet, found limited application to environmental or other complex matrices...
July 11, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28688234/separation-and-characterization-of-unknown-impurities-in-cefonicid-sodium-by-trap-free-two-dimensional-liquid-chromatography-combined-with-ion-trap-time-of-flight-mass-spectrometry
#8
Jian Wang, Yu Xu, Yunfeng Zhang, Hong Wang, Weihui Zhong
RATIONALE: Seven unknown antibiotic impurities in cefonicid sodium were separated and characterized by a trap-free two-dimensional liquid chromatography coupled to high resolution ion trap/time-of-flight mass spectrometry s2D LC-IT-TOF MS) with positive and negative modes of electrospray ionization method. Trap-free two-dimensional liquid chromatography and online demineralization technique made it possible to characterize cefonicid sodium in the condition of the official standard, and the TIC chromatogram of LC-MS was in conformity with the LC chromatogram of the official analytical method in the peak sequence of impurities...
July 8, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28686794/simultaneous-quantitation-of-meperidine-nor-meperidine-tramadol-propoxyphene-and-nor-propoxyphene-in-human-plasma-using-solid-phase-extraction-and-gas-chromatography-mass-spectrometry-method-validation-and-application-to-cardiovascular-safety-of-therapeutic
#9
Nicolás Fernández, Nancy Mónica Olivera, Guillermo Alberto Keller, Roberto Alberto Diez, Guillermo Di Girolamo, Patricia Noemí Quiroga
RATIONALE: Several opioid analgesics have been related to the prolongation of cardiac repolarization, a condition which can be fatal. In order to establish a correct estimation of the risk / benefit balance of therapeutic doses of meperidine, normeperidine, tramadol, propoxyphene and norpropoxyphene, it was necessary to develop an analytical method to determinate plasma concentrations of these opioids. METHODS: Here we describe a method, which incorporates strong alkaline treatment to obtain norpropoxyphene amide followed by a one-elution step solid-phase extraction, and without further derivatization...
July 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28681982/application-of-paper-spray-ionization-for-explosives-analysis
#10
Chia-Wei Tsai, Christopher A Tipple, Richard A Yost
RATIONALE: A desired feature in the analysis of explosives is to decrease the time of the entire analysis procedure, including sampling. A recently utilized ambient ionization technique, paper spray ionization (PSI), provides the possibility of combining sampling and ionization. However, an interesting phenomenon that occurs in generating negatively charged ions pose some challenges in applying PSI to explosives analysis. The goal of this work is to investigate the possible solutions for generating explosives ions in negative mode PSI...
July 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28681476/evaluation-of-relative-electron-ionization-cross-sections-for-some-oxides-and-oxyacid-salts
#11
Sergey I Lopatin, Sergey M Shugurov, Andrej I Panin, Evgenia A Vasil'eva
RATIONALE: The total or relative cross-sections for the ionization of polyatomic molecules by electron ionization are essential data in a wide range of applications. In addition to the total ionization cross-sections, relative ionization cross-sections are sometimes also required. Accurate values of electron ionization cross-sections of high-temperature vapor species are of importance in mass spectrometric investigations. So the need for experimental ionization cross-section data for high-temperature vapor species is vital...
July 5, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28677846/analysis-of-oxovanadium-iv-complexes-using-electrospray-mass-spectrometry-molecular-ion-formed-by-loss-of-an-electron-and-its-product-ions-trapping-oxygen
#12
Xue Hou, Zhi-Jun Wu, Jian-Qiang Zhao, Wei-Cheng Yuan, Hua-Yi Qi
RATIONALE: In addition to their biological properties, oxovanadium complexes have been widely applied as catalysts because of their excellent catalytic-oxidation capability. Recently, monometallic oxovanadium (IV) complexes have been used as catalysts in the electrophilic trifluoromethylation of silyl ketene imines. Study of catalysts can contribute to understanding of the reaction mechanism. METHODS: Six monometallic oxovanadium (IV) complexes were analyzed by electrospray ionization time-of flight mass spectrometry (ESI-TOFMS), and collision-induced dissociation mass spectrometry (CID-MS) experiments were conducted for selected cations [M](+) of oxovanadium (IV) complexes as well as a D-labeled complex...
July 5, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28667829/rapid-and-simple-flow-injection-analysis-tandem-mass-spectrometric-fia-ms-ms-method-for-the-quantification-of-melphalan-in-lipid-based-drug-delivery-system
#13
Waleed Mohammed-Saeid, Deborah Michel, Ildiko Badea, Anas El-Aneed
The use of the anticancer drug melphalan is limited due to its poor water solubility. To address such limitation, it is incorporated within a novel delivery system using β-cyclodextrin-gemini surfactants (18:1βCDg). Herein, two fast and simple FIA-MS/MS methods are developed for the quantification of melphalan (Mel) within the drug delivery system so that the solubilization efficiency of the system can be assessed. FIA-MS/MS methods are developed using a triple quadrupole-linear ion trap mass spectrometer, equipped with electrospray ionization (ESI) in the positive ion mode...
July 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28667680/fast-and-comprehensive-characterization-of-chemical-ingredients-in-traditional-chinese-herbal-medicines-by-extractive-atmospheric-pressure-photoionization-eappi-mass-spectrometry
#14
Chengyuan Liu, Wu Wen, Jun Shao, Wan Zhao, Keke Qi, Jiuzhong Yang, Yang Pan
RATIONALE: The goal of this work is to employ extractive atmospheric pressure photoionization mass spectrometry (EAPPI MS) to characterize the constituents in traditional Chinese herbal medicine (TCHM) directly without chromatographic separation. METHODS: Sample was placed in 4 mL of methanol/water (v:v=3:1) in the nebulization cell, and then the ultrasonic nebulizer was switched on. Ultrasonic nebulization system allows the simultaneous sample extraction and introduction of extract aerosols...
July 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28657161/unambiguous-regiochemical-assignment-of-sulfoquinovosyl-mono-and-di-acylglycerols-in-parsley-and-spinach-leaves-by-liquid-chromatography-electrospray-ionization-sequential-mass-spectrometry-assisted-by-regioselective-enzymatic-hydrolysis
#15
Sara Granafei, Ilario Losito, Francesco Palmisano, Tommaso R I Cataldi
RATIONALE: Sulfoquinovosylmonoglycerides (SQMG) and sulfoquinovosyldiglycerides (SQDG) in the lipid extracts of parsley (Petroselinum crispum) and spinach (Spinacia oleracea) leaves were investigated. The aim of this work was to assess and establish the chemical characterization of fatty acyl chains in sulfolipids (SQMG and SQDG) and their regiochemistry. METHODS: A key component of this approach is a combination of hydrolysis reactions catalyzed by Lecitase® Ultra, which is a sn1 -regioselective hydrolase enzyme, and reversed-phase liquid chromatography with electrospray ionization and sequential mass spectrometry (RPLC-ESI-MS) by collision induced dissociation (CID)-MS(n) (n=2,3)...
June 28, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28656689/multiple-reaction-monitoring-mrm-profiling-for-biomarker-discovery-applied-to-human-polycystic-ovarian-syndrome
#16
Fernanda B Cordeiro, Christina R Ferreira, Tiago Jose P Sobreira, Karen E Yannell, Alan K Jarmusch, Agnaldo P Cedenho, Edson G Lo Turco, R Graham Cooks
RATIONALE: We describe multiple reaction monitoring (MRM)-profiling, which provides accelerated discovery of discriminating molecular features, and its application to human polycystic ovary syndrome (PCOS) diagnosis. The discovery phase of the MRM-profiling seeks molecular features based on some prior knowledge of the chemical functional groups likely to be present in the sample. It does this through use of a limited number of pre-chosen and chemically specific neutral loss and/or precursor ion MS/MS scans...
June 28, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28636125/forensic-application-of-stable-isotope-delta-values-proposed-minimum-requirements-for-method-validation
#17
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
#18
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
#19
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
#20
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
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