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Rapid Communications in Mass Spectrometry: RCM

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https://www.readbyqxmd.com/read/28220554/changes-in-stable-isotope-ratios-in-pdo-cheese-related-to-the-area-of-production-and-green-forage-availability-the-case-study-of-pecorino-siciliano
#1
Bernardo Valenti, Luisa Biondi, Luca Campidonico, Luana Bontempo, Giuseppe Luciano, Fortunato Di Paola, Venera Copani, Luca Ziller, Federica Camin
RATIONALE: No study has investigated the variations of stable isotope ratios (SIRs) of bioelements within a Protected Designations of Origin (PDO) cheese and few studies have focused on the dietary background of animals. For traceability purposes, it is important to know how and whether these issues affect SIRs in a PDO cheese. METHODS: Thirty-six Pecorino Siciliano cheese samples were collected in three east-Sicilian areas in seasons in which green herbage was present or absent in an animal's diet...
February 20, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28199065/rapid-characterization-of-trace-aflatoxin-b1-on-groundnuts-wheat-and-maize-by-dispersive-liquid-liquid-microextraction-followed-by-direct-electrospray-probe-tandem-mass-spectrometry
#2
Thiphol Satarpai, Atitaya Siripinyanond, Hung Su, Jentaie Shiea
RATIONALE: Aflatoxins are poisonous and cancer-related chemical compounds commonly existed in crops and plants. Aflatoxin B1 is the most toxic compound among aflatoxins and has been classified as Group 1 carcinogenic to human, especially on liver cancer. Herein, an ambient mass spectrometric method was developed for rapid characterization of trace aflatoxin B1 on peanuts. METHODS: Direct electrospray probe tandem mass spectrometry was used to detect aflatoxin B1 on peanuts...
February 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28199054/optimization-by-infusion-of-multiple-reaction-monitoring-transitions-for-sensitive-peptides-lc-ms-quantification
#3
Bandar Alghanem, Frédéric Nikitin, Thomas Stricker, Eva Duchoslav, Jeremy Luban, Caterina Strambio-De-Castillia, Markus Muller, Frédérique Lisacek, Emmanuel Varesio, Gérard Hopfgartner
RATIONALE: In LC-MS peptide quantification, the optimization of multiple reaction monitoring (MRM) parameters is essential for sensitive detection. We have compared different approaches to build MRM assays, based either on flow injection analysis (FIA) of isotopically labelled peptides, or on the knowledge and the prediction of the best settings for MRM transitions and collision energies (CE). In this context, we introduce MRMOptimizer, an open source software tool that processes spectra and assists the user in selecting transitions in the FIA workflow...
February 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28199040/isotopic-half-life-and-enrichment-factor-in-two-species-of-european-freshwater-fish-larvae-an-experimental-approach
#4
Adrien Latli, Nicolas Sturaro, Nelson Desjardin, Loïc N Michel, William Otjacques, Gilles Lepoint, Patrick Kestemont
RATIONALE: Stable isotope ratios of carbon and nitrogen are valuable tools for field ecologists to use to analyse animal diets. However, the application of these tools requires knowledge of the tissue enrichment factor (TEF) and half-life (HL). We experimentally compared TEF and HL in 2 freshwater fish larvae. We hypothesised that chub had a better growth/tissue replacement ratio than roach, due to the use of a food closer to their natural diet. METHODS: We determined the isotopic HL, the TEF and the contribution of growth or metabolic tissue replacement to dynamic isotopic incorporation...
February 15, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28195377/a-three-minute-method-for-high-throughput-quantitative-metabolomics-and-quantitative-tracing-experiments-of-central-carbon-and-nitrogen-pathways
#5
Travis Nemkov, Kirk C Hansen, Angelo D'Alessandro
RATIONALE: The implementation of mass spectrometry-based metabolomics is advancing many areas of biomedical research. The time associated with traditional chromatographic methods for resolving metabolites prior to mass analysis has limited the potential to perform large scale, highly powered metabolomics studies and clinical applications. METHODS: Here we describe a three-minute method for the rapid profiling of central metabolic pathways through UHPLC-MS, tracing experiments in vitro and in vivo, and targeted quantification of compounds of interest using spiked in heavy labeled standards...
February 13, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28181731/two-dimensional-mass-spectrometry-in-a-linear-ion-trap-an-in-silico-model
#6
Maria A van Agthoven, Peter B O'Connor
RATIONALE: Two-dimensional mass spectrometry is a technique that correlates precursor and product ions in a sample without requiring prior ion isolation. Until now, this technique has only been implemented on Fourier transform ion cyclotron resonance mass spectrometers. By coupling two-dimensional mass spectrometry techniques in linear ion traps with a mass analyser with a fast duty cycle (e.g. time-of-flight), data-independent tandem mass spectrometry techniques can be compatible on an LC or GC timescale...
February 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28181729/the-dietary-protein-paradox-and-threonine-15-n-depletion-pyridoxal-5-phosphate-enzyme-activity-as-a-mechanism-for-the-%C3%AE-15-n-trophic-level-effect
#7
B T Fuller, K J Petzke
RATIONALE: Nitrogen stable isotope ratios (δ(15) N values) are used to reconstruct dietary patterns, but the biochemical mechanism(s) responsible for the diet to tissue trophic level effect and its variability are not fully understood. Here δ(15) N amino acid (AA) values and physiological measurements (nitrogen intake, plasma albumin concentrations, liver reduced glutathione concentrations and leucine oxidation rates) are used to investigate increased dietary protein consumption and oxidative stress (vitamin E deficiency) in rat total plasma protein...
February 9, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28171682/unusual-electrospray-ionization-induced-fragmentation-structural-elucidation-of-an-in-process-synthetic-intermediate-of-doravirine-mk-1439-using-lc-hrms-ms-and-2d-nmr
#8
Huaming Sheng, Katrina W Lexa, Li-Kang Zhang, Rong-Sheng Yang, Timothy J Wright, Benjamin D Sherry, Roy Helmy, Gary E Martin
RATIONALE: During the development of a novel synthetic route to doravirine; (1), a human immunodeficiency type 1 virus (HIV-1) nonnucleoside reverse transcriptase inhibitor (NNRTI), an unanticipated reaction intermediate, methyl (Z)-2-(3-chloro-5-cyanophenoxy)-5-(3-(3-chloro-5-cyanophenoxy)-2-oxo-4-(trifluoromethyl)pyridin-1(2H)-yl)-5-ethoxy-3-(trifluoromethyl)pent-2-enoate (2), was isolated. Moreover, the unusual ESI induced fragmentation was observed for 2. Hence, efforts were made towards the understanding of the structure of 2, which was crucial for the understanding of the reaction mechanism...
February 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28168754/the-relative-influence-of-derivatization-and-normalization-procedures-on-the-compound-specific-stable-isotope-analysis-of-nitrogen-in-amino-acids
#9
Christopher Yarnes, Julian Herszage
RATIONALE: Within the last decade, applications of compound-specific stable isotope analysis of nitrogen (δ(15) N values) in amino acids (CSIA-AA) have developed rapidly, particularly within organismal ecology. Unlike with bulk stable isotope analysis (BSIA), the reproducibility of δ(15) N-AA measurements has not been critically assessed. Two primary concerns include the diversity of techniques available for the derivatization of amino acids prior to analysis by gas chromatography/combustion/isotope-ratio mass spectrometry (GC/C/IRMS) and the myriad of standardization practices and quality assurance procedures used across studies...
February 6, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28158936/characteristic-nh3-and-co-losses-of-sodiated-peptides-c-terminated-by-glutamine-residue
#10
Xinshu Guan, Bing Wang, Huixin Wang, Jinrong Liu, Ying Li, Xinhua Guo
RATIONALE: In certain conditions some amino acid (AA) residues undergo special reactions in the gas phase, generating characteristic neutral losses and product ions. Taking these special fragments into account and understanding the effect of AA residues on peptide cleavages will consummate database search algorithms and manual data interpretation in peptide sequencing by mass spectrometry (MS). In this study, the detail of the characteristic NH3 and CO losses of glutamine (Gln) residue located at the C-terminus of peptides is presented...
February 3, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28155261/dietary-protein-content-and-tissue-type-control-13-c-discrimination-in-mammals-an-analytical-approach
#11
Erik A Hobbie
RATIONALE: Carbon isotope measurements on collagen and other tissues are used in modern and paleodiet studies, and relating these patterns to the dietary protein fraction (fdp ) and δ(13) C values of dietary protein and energy (lipids and carbohydrates) remains important for determining diets. METHODS: Carbon fluxes from dietary protein to tissues in feeding studies of mice, rats, and pigs were estimated to test how tissue δ(13) C values related to the δ(13) C values of dietary protein, dietary energy, fdp , or loge fdp ...
February 3, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28097710/comparative-evaluation-of-label-free-quantification-methods-for-shotgun-proteomics
#12
Julia A Bubis, Lev I Levitsky, Mark V Ivanov, Irina A Tarasova, Mikhail V Gorshkov
RATIONALE: Label-free quantification (LFQ) is a popular strategy for shotgun proteomics. A variety of LFQ algorithms have been developed recently. However, a comprehensive comparison of the most commonly used LFQ methods is still rare, in part due to a lack of clear metrics for their evaluation and an annotated and quantitatively well-characterized data set. METHODS: Five LFQ methods were compared: spectral counting based algorithms SIN , emPAI, and NSAF, and approaches relying on the extracted ion chromatogram (XIC) intensities, MaxLFQ and Quanti...
January 18, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28093819/investigation-of-the-quasi-simultaneous-arrival-qsa-effect-on-a-cameca-ims-7f-geo
#13
Clive Jones, David A Fike, Paula Peres
RATIONALE: IMS 7f-GEO isotope ratio applications increasingly involve analyses (e.g., S(-) or O(-) isotopes, coupled with primary ion currents < 30 pA) for which quasi-simultaneous arrival (QSA) could compromise precision and accuracy of data. QSA and associated correction have been widely investigated for the CAMECA NanoSIMS instruments, but not for the IMS series. METHODS: Sulfur and oxygen isotopic ratio experiments were performed using an electron multiplier (EM) detector, employing Cs(+) primary ion currents of 1, 2, 5 and 11...
January 17, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28085216/simultaneous-determination-of-volatile-organic-compounds-vocs-with-a-wide-range-of-polarities-in-urine-by-headspace-solid-phase-microextraction-hs-spme-coupled-to-gas-chromatography-mass-spectrometry
#14
Han-Na Song, Chong Hyeak Kim, Won-Yong Lee, Sung-Hee Cho
RATIONALE: Volatile organic compounds (VOCs) are ubiquitous environmental pollutants that have a high vapor pressure at room temperature. Some VOCs have been classified as carcinogenic to humans by the International Agency for Research on Cancer (IARC), because they can bind to DNA and cause cell mutations. Therefore, monitoring of VOCs in human urine is very important to evaluate the correlation between exposure to VOCs and human disease. METHODS: We have developed an improved analytical method for the simultaneous determination of VOCs with a wide range of polarities in human urine samples by headspace solid-phase microextraction (HS SPME) coupled to gas chromatography-mass spectrometry (GC/MS)...
January 13, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28075041/engineering-matrix-free-laser-desorption-ionization-mass-spectrometry-using-glancing-angle-deposition-films
#15
Reshma Singh, Louis W Bezuidenhout, Abebaw Jemere, Zhen Wang, Michael Brett, D Jed Harrison
Thin, nanoporous films fabricated using Glancing Angle Deposition (GLAD) technology are demonstrated for solid matrix laser desorption ionization mass spectrometry (SMALDI-MS). GLAD allows facile engineering of naonporosity, film thickness, post alignment, and material composition, as demonstrated here by the fabrication of Co-GLAD and Si-GLAD films for SMALDI, and by exploration of the SMALDI performance as a function of thickness, post density, and angle of the post relative to surface normal. GLAD films were prepared by electron beam evaporation onto silicon substrates, using steep angles of incidence for the vacuum deposition, with computer controlled substrate rotation...
January 11, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28072489/development-and-application-of-sub-2%C3%A2-%C3%A2%C2%B5m-particle-co2-based-chromatography-coupled-to-mass-spectrometry-for-comprehensive-analysis-of-lipids-in-cottonseed-extracts
#16
Carolina Salazar, Michael D Jones, Drew Sturtevant, Patrick J Horn, Janna Crossley, Khadiza Zaman, Kent D Chapman, Mark Wrona, Giorgis Isaac, Norman Smith, Vladimir Shulaev
RATIONALE: Refined cottonseed oil has widespread applications in the food and chemical industries. Although the major lipids comprising cottonseed oil (triacylglycerols) are well known, there are many diverse lipid species in cotton seeds that occur at much lower levels and have important nutritional or anti-nutritional properties. METHODS: The lipid technical samples were prepared in chloroform. The biological samples were extracted using a mixture of isopropanol:chloroform:H2 O (2:1:0...
January 10, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28063248/interactive-van-krevelen-diagrams-advanced-visualization-of-mass-spectrometry-data-of-complex-mixtures
#17
LETTER
William Kew, John W T Blackburn, David J Clarke, Dušan Uhrín
No abstract text is available yet for this article.
January 7, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27943476/effects-of-decomposition-on-carbon-and-nitrogen-stable-isotope-values-of-muscle-tissue-of-varying-lipid-content-from-three-aquatic-vertebrate-species
#18
David J Yurkowski, Anna J Hussey, Nigel E Hussey, Aaron T Fisk
RATIONALE: Stable isotopes are a prominent tool in animal ecology where data is obtained from analyzing animal tissues, which are typically stored prior to analysis. However, the effect of decomposition on the reliability of stable isotope ratios from animal tissue prior to storage has been seldom studied. Here, we examine the long-term effects of freezing and decomposition of animal tissue on δ(13) C and δ(15) N values across three different aquatic species of varying lipid content...
December 10, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27933719/depth-profiling-cross-linked-poly-methyl-methacrylate-films-a-tof-sims-approach
#19
Soheila Naderi-Gohar, Kevin M H Huang, Yiliang Wu, Woon Ming Lau, Heng-Yong Nie
RATIONALE: In order to determine the degree of cross-linking on the surface and its variations in a nanometer-scale depth of organic materials, we developed an approach based on time-of-flight secondary ion mass spectrometry (TOF-SIMS), which provides rich chemical information in the form of fragment ions. TOF-SIMS is extremely surface sensitive and capable of depth profiling with the use of a sputter ion beam to remove controllable amounts of substance. METHODS: Poly(methyl methacrylate) (PMMA) films spin-coated on a Si substrate were cross-linked using a recently developed, surface sensitive, hyperthermal hydrogen projectile bombardment technique...
December 9, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/27933669/characterization-of-nitrated-sugar-alcohols-by-atmospheric-pressure-chemical-ionization-mass-spectrometry
#20
Alla Ostrinskaya, Jude A Kelley, Roderick R Kunz
RATIONALE: The nitrated sugar alcohols mannitol hexanitrate (MHN), sorbitol hexanitrate (SHN) and xylitol pentanitrate (XPN) are in the same class of compounds as the powerful military grade explosive pentaerythritol tetranitrate (PETN) and the homemade explosive erythritol tetranitrate (ETN) but, unlike for PETN and ETN, ways to detect MHN, SHN and XPN by mass spectrometry (MS) have not been fully investigated. METHODS: Atmospheric-pressure chemical-ionization mass spectrometry (APCI-MS) was used to detect ions characteristic of nitrated sugar alcohols...
December 9, 2016: Rapid Communications in Mass Spectrometry: RCM
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