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Rapid Communications in Mass Spectrometry: RCM

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https://www.readbyqxmd.com/read/28815824/time-of-flight-secondary-ion-mass-spectrometry-tof-sims-using-a-new-primary-ion-beam-generated-by-vacuum-electrospray-of-a-protic-ionic-liquid-propylammonium-nitrate
#1
Yukio Fujiwara, Naoaki Saito
RATIONALE: Protic ionic liquids have the potential to be useful materials for primary ion beams in terms of protonation, since they have active protons. Selecting protic ionic liquids suitable for primary ion beams is of great importance to increase molecular secondary ion yields. Propylammonium nitrate ([C3 H7 NH3 ][NO3 ]) seems promising in view of its proton affinity. It is likely that [C3 H7 NH3 ](+) cations can act as proton donors, and [NO3 ](-) anions can work as proton acceptors...
August 16, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28815763/does-low-energy-collision-induced-dissociation-of-lithiated-and-sodiated-carbohydrates-always-occur-at-anomeric-carbon-of-reducing-end
#2
Shang-Ting Tsai, Jien-Lian Chen, Chi-Kung Ni
RATIONALE: Collision-induced dissociation (CID) tandem mass spectrometry is one of the major methods in the structural determination of carbohydrates. Previous experimental studies and theoretical investigation of lithiated and sodiated underivatized carbohydrates seem to indicate that dehydration reaction and cross ring dissociation of low-energy CID mainly occur at the anomeric carbon of reducing end. However, these studies only investigated few carbohydrates. METHODS: ESI-MS/MS spectra of [M+Li](+) and [M+Na](+) ions of several (18) O1-labeled monosaccharides and disaccharides at O1 of reducing end were studied using linear ion trap mass spectrometer...
August 16, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28815810/proteome-characterization-of-human-pancreatic-cyst-fluid-from-intraductal-papillary-mucinous-neoplasm-by-lc-ms-ms
#3
Joonho Park, Dohyun Han, Misol Do, Jongmin Woo, Joseph I Wang, Youngmin Han, Wooil Kwon, Sun-Whe Kim, Jin-Young Jang, Youngsoo Kim
RATIONALE: In recent years, the molecular components of pancreatic cyst fluid has been used for diagnosis and prognosis. Because the protein markers that are currently used in clinical tests are unreliable, proteomic studies to find new protein markers are being conducted. However, such researches have been limited due to the complexity of pancreatic cyst fluid and the immaturity of proteomic techniques. METHODS: To overcome these limitations and provide a pancreatic cyst proteome dataset, we examined cyst fluid proteome with tandem mass spectrometry...
August 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28809062/carbon-nitrogen-and-sulphur-isotopic-fractionation-in-captive-juvenile-hooded-seal-cystophora-cristata-application-for-diet-analysis
#4
Marianna Pinzone, Mario Acquarone, Loreen Huyghebaert, Nicolas Sturaro, Loïc N Michel, Ursula Siebert, Krishna Das
RATIONALE: Intrinsic biogeochemical markers, such as stable isotope ratios of carbon, nitrogen and sulphur are increasingly used to trace the trophic ecology of marine top predators. However, insufficient knowledge of fractionation processes in tissues continues to hamper the use of these markers. METHODS: We performed a controlled feeding experiment with eight juvenile hooded seals (Cystophora cristata) that were held on a herring-based diet (Clupea harengus) for two years...
August 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28805274/quantitative-characterization-of-galectin-3-c-affinity-mass-spectrometry-measurements-comprehensive-data-analysis-obstacles-shortcuts-and-robustness
#5
Marko Haramija, Jasna Peter-Katalinić
RATIONALE: Affinity mass spectrometry (AMS) is an emerging tool in the field of study of protein-carbohydrate complexes. However, experimental obstacles and data analysis is preventing faster integration of AMS methods in the field of glycosciences. Here we show how analysis of direct ESI-MS AMS data can be simplified for screening purposes, even for complex AMS spectra. METHODS: Direct ESI-MS assay was tested in this study, and binding data for the galectin-3C•lactose complex were analyzed using comprehensive and simplified data analysis approach...
August 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28805260/determination-of-carbon-isotope-enrichment-factors-of-cis-dce-after-precursor-amendment
#6
Simon Leitner, Thomas G Reichenauer, Andrea Watzinger
RATIONALE: Bacterial reductive dechlorination of the groundwater contaminant tetrachloroethene (PCE) involves the formation of lower chlorinated metabolites. Metabolites can be instantaneously formed and consumed in this sequential process; quantification and validation of their isotopic effects conventionally rely on separate laboratory microcosm studies. Here, we present an evaluation method enabling the determination of the carbon isotope enrichment factor (ε) for the intermediate cis-dichloroethene (cis-DCE) by a single laboratory microcosm study initially amending the precursor PCE only...
August 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28805256/effects-of-euthanasia-methods-on-stable-carbon-%C3%AE-13-c-value-and-nitrogen-%C3%AE-15-n-value-isotopic-composition-of-fry-and-juvenile-rainbow-trout-oncorhynchus-mykiss
#7
Sarah Nahon, Sarah Séité, Joanna Kolasinski, Pierre Aguirre, Inge Geurden
RATIONALE: Carbon and nitrogen stable isotope analyses of fish tissues are now commonly used in ecological studies but mostly require the sacrifice of the animal. Ethical considerations recommend the use of anesthetics for tissue sampling. This study examines how anesthetics affect stable isotope ratios of fish compared with other euthanasia methods. METHODS: Rainbow trout fry and juveniles were sacrificed using ice-freezing (as this common method used to kill fish does not affect natural isotopic ratios), electronarcosis or an overdose of chemical anesthetics (2-phenoxyethanol, benzocaine and clove oil)...
August 14, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28792632/a-simple-and-economical-strategy-for-obtaining-calibration-plots-for-relative-quantification-of-positional-isomers-of-yyx-yxy-triglycerides-using-high-performance-liquid-chromatography-tandem-mass-spectrometry
#8
Elizabeth J Judge, Dong Zheng, Swathilekha Chivukula, Robert Gakwaya, Sarah Schostarez, Xingwen Li, Melissa Liriano, Jason J Evans
RATIONAL: Positional analysis of intact triglycerides could provide greater insights into the link between fatty acid position and lipotoxic diseases. However, this methodology has been impeded by lack of commercial availability of positionally pure triglycerides. This work reports on a strategy for defining calibration plots for YXY/YYX triglyceride systems based on the product ion intensities in the collisional-induced dissociation spectra of ammoniated parent ions. METHODS: A set of triglycerides were synthesized and analyzed by electrospray tandem mass spectrometry using an ion trap mass spectrometer...
August 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28792631/post-mortem-oxygen-isotope-exchange-within-cultured-diatom-silica
#9
Jonathan J Tyler, Hilary J Sloane, Rosalind E M Rickaby, Eileen J Cox, Melanie J Leng
RATIONALE: Potential post-mortem alteration to the oxygen isotope composition of biogenic silica is critical to the validity of palaeoclimate reconstructions based on oxygen isotope ratios (δ(18) O values) from sedimentary silica. We calculate the degree of oxygen isotope alteration within freshly cultured diatom biogenic silica in response to heating and storing in the laboratory. METHODS: The experiments used freshly cultured diatom silica. Silica samples were either stored in water or dried at temperatures between 20 °C and 80 °C...
August 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28792093/polymer-spray-mass-spectrometric-detection-and-quantitation-of-hydrophilic-compounds-and-some-narcotics
#10
Maria T Dulay, Richard N Zare
RATIONALE: High throughput screening of biofluids is essential in monitoring concentration of a variety of drugs to determine their efficacy and toxicity. Organosiloxane polymers prepared by sol-gel chemistry as sample supports and electrospray-ionization emitters in a single material and as an alternative to paper substrates, is described in this study. METHODS: Hydrophobic drugs and hydrophilic streptomycin were analyzed by polymer-spray MS with an LTQ-Orbitrap mass spectrometer...
August 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28782138/a-cautionary-note-on-the-effects-of-laboratory-air-contaminants-on-ambient-ionization-mass-spectrometry-measurements
#11
Sambhav R Kumbhani, Lisa M Wingen, Véronique Perraud, Barbara J Finlayson-Pitts
RATIONALE: Ambient ionization mass spectrometry methods are convenient, sensitive and require little sample preparation. However, they are susceptible to species present in air surrounding the mass spectrometer. This study identifies some challenges associated with the potential impacts of indoor air contaminants on ionization and analysis involving open air methods. METHODS: Unexpected effects of volatile organic compounds from floor maintenance activities on ambient ionization mass spectrometry were studied using three different ambient ionization techniques...
August 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28776775/targeted-metabolic-profiling-rapidly-differentiates-escherichia-coli-and-staphylococcus-aureus-at-species-and-strains-level
#12
Haorong Li, Jiangjiang Zhu
RATIONAL: Pathogenic food-borne bacteria have been associated with severe infectious disease in humans and animals worldwide. Rapid detection and screening of these foodborne pathogens are critical for our food safety. This study aimed at detecting Escherichia coli and Staphylococcus aureus, two important foodborne bacteria, from species and strains/serovar level using mass spectrometry (MS)-based targeted metabolic profiling approach. METHODS: Ten E. coli strains (8 out of 10 were foodborne outbreak isolates) and four S...
August 4, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28766761/a-comparison-of-esi-apci-and-appi-ionization-for-the-lc-ms-ms-analysis-of-bisphenols-application-to-bisphenols-in-thermal-paper-receipts-and-u-s-currency-notes
#13
Henry J Eichman, Bryan J Eck, Anthony F Lagalante
RATIONALE: Human health concerns have arisen for common bisphenols (BPA and BPS) as well as new structural analogs. While native sulfone bisphenols and sulfone derivatized bisphenols are amenable to ESI, alternative ionization methods such as APCI and APPI were investigated to analyze non-derivatized, non-sulfone containing bisphenols. METHODS: Ionization of bisphenols using negative ion APPI was compared to negative ion ESI and negative ion APCI for their relative abilities to produce [M-H](-) precursor ions for subsequent collision activated dissociation (CAD) in a triple quadrupole mass analyzer...
August 2, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28763576/methodological-considerations-regarding-online-extraction-of-water-from-soils-for-stable-isotope-determination
#14
LETTER
Brynne Ellen Lazarus, Matthew J Germino
No abstract text is available yet for this article.
August 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28763166/comparison-of-three-methods-for-the-methylation-of-aliphatic-and-aromatic-compounds
#15
Hyejung Lee, Sarah J Feakins, Zhiyao Lu, Arndt Schimmelmann, Alex L Sessions, Jessica E Tierney, Travis J Williams
RATIONALE: Methylation protocols commonly call for acidic, hot conditions that are known to promote organic (1) H/(2) H exchange in aromatic and aliphatic C-H bonds. Here we tested two such commonly-used methods and compared a third that avoids these acidic conditions, to quantify isotope effects with each method and to directly determine acidic-exchange rates relevant to experimental conditions. METHODS: We compared acidic and non-acidic methylation approaches catalyzed by hydrochloric acid, acetyl chloride and EDCI (1-ethyl-3-(3-dimethylaminopropyl)carbodiimide) / DMAP (4-dimethylaminopyridine) respectively...
August 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28755479/identifying-exposition-to-low-oxygen-environment-in-human-macrophages-using-secondary-ion-mass-spectrometry-and-multivariate-analysis
#16
Magali Court, Jean-Paul Barnes, Arnaud Millet
RATIONALE: Macrophages are innate immune cells presenting a strong phenotypic plasticity and deeply involved in tissue homeostasis. Oxygen environmental tension is a physical parameter that could influence their polarizations. In this study we use ToF-SIMS to describe how various polarizations are modified by a low oxygen exposure. METHODS: ToF-SIMS experiments were performed using an IONTOF ToF-SIMS 5-100 (ION-TOF GmbH, Munster, Germany). Analysis was performed using a pulsed 25 keV Bi(3+) beam, sputtering was performed using a 250 eV Cs beam...
July 29, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28753734/negative-ions-molecular-electron-affinity-and-orbital-structure-of-cata-condensed-polycyclic-aromatic-hydrocarbons
#17
Rustem V Khatymov, Mars V Muftakhov, Pavel V Shchukin
RATIONALE: Polycyclic aromatic hydrocarbons are molecules of ecological, astrochemical significance, and find practical applications in organic electronics, photonics and the chemical synthesis of novel materials. The utility of these molecules often implies the occurrence of their ionized forms. Studies in the gas phase of elementary processes of energy-controlled interaction of molecules with low-energy electrons shed light on the mechanisms of transient negative ion formation and evolution...
July 28, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28752562/gas-phase-chemical-ionization-of-4-alkyl-branched-chain-carboxylic-acids-and-3-methylindole-using-h3-o-no-and-o2-ions
#18
Hardy Z Castada, Sheryl Barringer, Macdonald Wick
RATIONALE: 4-methyloctanoic acid, 4-ethyloctanoic acid, 4-methylnonanoic acid, and 3-methylindole are primary contributors to the distinctive aroma and flavor of lamb meat. The reactions of H3 O(+) , NO(+) , and O2(+) with these compounds, and identification of the product ions and their distribution, are fundamental to their characterization and rapid, real-time trace analysis using SIFT-MS. METHODS: The chemical ionization of pure standards of 4-ethyloctanoic acid, 4-methyloctanoic acid, 4-ethylnonanoic acid, and 3-methylindole was carried out using the H3 O(+) , NO(+) , and O2(+) reagent ions of a V200(TM) selected ion flow tube-mass spectrometer...
July 28, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28750155/a-comparison-using-faraday-cups-with-10-13-%C3%AE-amplifiers-and-a-secondary-electron-multiplier-to-measure-os-isotopes-by-negative-thermal-ionization-mass-spectrometry
#19
Guiqin Wang, Tiantian Sun, Jifeng Xu
RATIONALE: According to the Johnson-Nyquist noise equation, the value of electron noise is proportional to the square root of the resistor value. This relationship gives a theoretical improvement of √100 in the signal/noise ratio by going from 10(11) Ω to 10(13) Ω amplifiers for Faraday detection in thermal ionization mass spectrometry (TIMS). METHODS: We measured Os isotopes using static Faraday cups with 10(13) Ω amplifiers in a negative thermal ionization mass spectrometry (NTIMS) and compared the results with those obtained with 10(11) Ω amplifiers and by peak hopping on a single secondary electron multiplier (SEM)...
July 27, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28708331/negative-chemical-ionization-gas-chromatography-mass-spectrometry-of-transfluthrin-in-rat-plasma-and-brain
#20
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
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