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Rapid Communications in Mass Spectrometry: RCM

Jingren Deng, Morgan H Julian, Iulia M Lazar
RATIONALE: Biological studies are conducted at ever increasing rates by relying on proteomic workflows. Although MS data acquisition is highly automated and rapid, sample preparation continues to be the bottleneck of developing high-throughput workflows. Enzymatic protein processing, in particular, involves time-consuming protocols that can extend from one day to another. To address this gap, we developed and evaluated simple, in-solution tryptic enzymatic reactions that unfold within a few minutes, and demonstrate the utility of the methodology for the rapid analysis of proteins originating from cancer cell extracts...
September 16, 2018: Rapid Communications in Mass Spectrometry: RCM
Tomasz Krawczyk, Mariusz Zalewski, Rafał Szołtysik, Anna Korytkowska-Wałach
RATIONALE: Residual initiators in polymers are a concern in the case of products that come directly in contact with human body or food. Due to low concentrations and difficulties in the sample preparation highly sensitive and selective methods are required. METHODS: A series of bissillyl- and alkyl-silylperoxides were analysed by the electrospray ionisation mass spectrometry (ESI-MS) on a UPLC-TOF instrument. Li, Na, K, and NH4 acetates were used to promote the formation of [M+Me]+ ions...
September 16, 2018: Rapid Communications in Mass Spectrometry: RCM
Wadha Abushareeda, Marc Tienstra, Arjen Lommen, Marco Blokland, Saskia Sterk, Suhail Kraiem, Peter Horvatovich, Michel Nielen, Muhammad Al-Maadheed, Costas Georgakopoulos
RATIONALE: The Worla Anti-doping Agency (WADA) encourages drug-testing laboratories to develop screening methods that can detect as many doping substances as possible in urine. The use of full-scan high-resolution acquisition (FS/HR) with GC/MS for the detection of known and unknown trimethylsilyl (TMS) derivatives of anabolic-androgenic steroids (AAS) provides anti-doping testing bodies with a new analytical tool. METHODS: The AAS were extracted from urine samples by generic liquid-liquid extraction, after enzymatic hydrolysis, and TMS derivatization...
September 14, 2018: Rapid Communications in Mass Spectrometry: RCM
Alessandro Vetere, Wasim Alachraf, Saroj K Panda, Jan T Andersson, Wolfgang Schrader
RATIONALE: 1Structural characterization of individual compounds in very complex mixtures is difficult to achieve. One important step in structural elucidation is understanding the mass spectrometric fragmentation mechanisms of the compounds present in such mixtures. Here, different individual compounds presumed to be present in a complex crude oil mixture have been synthesized and structurally characterized by MS/MS studies. METHODS: Model compounds with different aromatic cores and various substitutents were synthesized...
September 9, 2018: Rapid Communications in Mass Spectrometry: RCM
Hai-Peng Jiang, Nian Cai, Xiu-Lian Ju, Juan Huang, Xian Wang
RATIONALE: Gallic acid is one of the most common polyphenols in natural products and human diet. The consumption of gallic acid reduces the incidence of cardiovascular diseases, chronic metabolic disorders and cancers. Most of previous publications focused on gallic acid's antioxidative or prooxidative properties. In the present work, gallic acid as a trapping agent of blood formaldehyde was investigated by LC-MS/MS and neutral loss scan. METHODS: Serum samples incubated with gallic acid were subjected to an LTQ XL ion trap mass spectrometer for the LC-MS/MS analysis...
September 7, 2018: Rapid Communications in Mass Spectrometry: RCM
Patrick Charapata, Larissa Horstmann, Amber Jannasch, Nicole Misarti
RATIONALE: A LC/MS/MS method was validated and utilized to measure and analyze four steroid hormones related to stress and reproduction in individual samples from a novel tissue, Pacific walrus (Odobenus rosmarus divergens, herein walrus) bone. This method determines steroid hormone concentrations in the remote walrus population over millennia from archaeological (>200 BP), historical (200 - 20 BP), and modern (2014 - 2016) time periods. METHODS: Lipids were extracted from Pacific walrus bone collected from archaeological, historical, and modern times periods using methanol before LC/MS/MS analysis...
September 7, 2018: Rapid Communications in Mass Spectrometry: RCM
Imen Abbes, Christophe Rihouey, Julie Hardouin, Thierry Jouenne, Emmanuelle De, Stéphane Alexandre
RATIONALE: Pseudomonas aeruginosa is an opportunistic pathogen bacteria widely considered as an excellent research model in several areas of molecular studies, namely genomics and proteomics. However its lipid metabolism is still not totally decrypted. While it is known that this bacterium has the particularity to produce phosphatidylcholine, a lipid mainly found in eukaryotes, other singularities are still to be discovered. METHODS: P. aeruginosa was grown as planktonic cultures to the stationary-state...
September 1, 2018: Rapid Communications in Mass Spectrometry: RCM
Phillip M Mach, Elizabeth S Dhummakupt, Daniel O Carmany, Ethan M McBride, Michael W Busch, Paul S Demond, Gabrielle M Rizzo, Donna E Hollinshead, Trevor Glaros
RATIONALE: The analysis of chemical warfare agents (CWAs) from ambient atmosphere presents an analytical challenge due to their ease of degradation and volatility. Herein is described a method for derivatizing CWAs directly onto a paper spray substrate prior to analysis. This derivatization allows for much longer times of analysis without sample degradation and with little to no sample prep. METHODS: Derivatization was performed using 2-[(dimethylamino)methyl] phenol both in-vial and directly on paper spray cartridges...
August 28, 2018: Rapid Communications in Mass Spectrometry: RCM
Kazuya Takahashi, Yoichi Nakai, Yuko Motizuki, Toshiyuki Ino, Shigeru Ito, Satoru B Ohkubo, Takeshi Minami, Yuichi Takaku, Yoshitaka Yamaguchi, Miho Tanaka, Hideaki Motoyama
RATIONALE: Sulfur is widely distributed in nature, and sulfur isotopic measurements have been applied to elucidate the origin and transport of sulfuric compounds in the lithosphere, biosphere, and atmosphere. Analyses of samples containing small amounts of sulfur, such as the Antarctic ice core samples analyzed herein, require a high-sensitivity analytical method. METHODS: We developed a high-sensitivity sulfur isotopic ratio (δ34 S value) analytical system equipped with an elemental analyzer, a cryo-flow device, and an isotope ratio mass spectrometer, and established a measurement and calibration procedure...
August 28, 2018: Rapid Communications in Mass Spectrometry: RCM
Shasha Li, Yue Zhou, Kaijie Xiao, Jing Li, Zhixin Tian
RATIONALE: Function study and application of an intact glycoprotein requires structural characterization of both the protein backbone and the glycan moiety; the former has been successfully demonstrated with selective fragmentation of the protein backbone in CID and ExD, whether the latter can be achieved with selective fragmentation of the glycan moiety remains to be explored. METHODS: RNase B solution was electrosprayed and its intact glycoforms of GlcNAc2 Mann (n=5-9) with the highest abundance (charge state z=16) was isolated individually and fragmented using CID, ETD, HCD, ETciD, and EThcD on the Orbitrap Fusion Lumos Tribrid MS; the dissociation parameters were optimized for selective fragmentation of the N-glycan moiety and protein backbone as well as high sequence coverage...
August 28, 2018: Rapid Communications in Mass Spectrometry: RCM
Hiroyuki Yokoi, Yuya Kasahara, Satoshi Obika, Takefumi Doi, Haruhiko Kamada
RATIONALE: Oligonucleotide therapeutics have been recently gaining more attention, but its pharmacokinetic evaluation methods are still not sufficient, and in particular, more tools are needed to evaluate their tissue distribution and metabolites. We developed a matrix-assisted laser desorption/ionization imaging mass spectrometry (MALDI-IMS) based method to evaluate the tissue distribution of oligonucleotide therapeutics. METHODS: We used an antisense oligonucleotide containing locked nucleic acids (LNA-A)...
August 28, 2018: Rapid Communications in Mass Spectrometry: RCM
Hui Ouyang, Tao Bo, Zhengxiang Zhang, Xinqiu Guo, Mingzhen He, Junmao Li, Shilin Yang, Xin Ma, Yulin Feng
RATIONALE: In the medicine and drug development, molecular modelling is an important tool. It is attractive to develop a platform connecting the theoretical structure modelling and the results from experimental measurement. In addition, separation and structure analysis of bioactive constituent isomers are still challenging. METHODS: Drift tube ion mobility (IM)-mass spectrometry (MS) provides the experimental collision cross section (CCS) which contains the structural information...
August 27, 2018: Rapid Communications in Mass Spectrometry: RCM
Fernando Gázquez, Mark W Claire
RATIONALE: Triple oxygen isotopes (16 O/17 O/18 O) in nitrate are a valuable tool to ascertain the pathways of nitrate formation in the atmosphere and the fate of nitrate in ecosystems. Here we present a new method for determining Δ17 O values in nitrates, based on nitrate-water isotope equilibration (IE) and subsequent isotopic analysis of water using cavity ringdown laser spectroscopy (CRDS). METHODS: Nitrate oxygen (O-NO3 - ) is equilibrated with water oxygen (O-H2 O) at low pH and 80o C...
August 23, 2018: Rapid Communications in Mass Spectrometry: RCM
Sarah Trimpin
Together with my group and collaborators, I have been fortunate to have had a key role in the discovery of new ionization processes that we developed into new flexible, sensitive, rapid, reliable, and robust ionization technologies and methods for use in mass spectrometry (MS). Our current research is focused on how best to understand, improve, and use these novel ionization processes which convert volatile and nonvolatile compounds from solids or liquids into gas-phase ions for analysis by MS using e.g. mass selected fragmentation and ion mobility spectrometry to provide reproducible, accurate, and improved mass and drift time resolution...
August 23, 2018: Rapid Communications in Mass Spectrometry: RCM
Christy J Mancuso, James R Ehleringer
RATIONALE: Strontium isotope ratios (87 Sr/86 Sr) in human fingernail keratin tissues have been underexplored for region of origin and travel history reconstruction studies. Here we investigated 87 Sr/86 Sr ratios in fingernail keratin to establish baseline measurements in a resident group and to examine how 87 Sr/86 Sr ratios changed with relocation. METHODS: Fingernail clippings were collected from resident (n=10) and non-resident/traveler groups (n=4 and n=4) that were part of a larger study in Salt Lake City (UT, USA) from 2015 to 2016...
August 23, 2018: Rapid Communications in Mass Spectrometry: RCM
Trevor K Decker, Yajun Zheng, Joshua S McClellan, Aaron J Ruben, Stephen A Lammert, Daniel E Austin, Aaron R Hawkins
RATIONALE: Ion trap mass spectrometers are attractive due to their inherent sensitivity and specificity. Miniaturization increases trap portability for in situ mass analysis by relaxing vacuum and voltage requirements but decreases the trapping volume. To overcome signal/resolution loss from miniaturization, double resonance ejection using phase tracking circuitry was investigated. METHODS: Phase tracking circuitry was developed to induce double resonance ejection in a planar linear ion trap using the β 2/3 hexapole resonance line...
August 22, 2018: Rapid Communications in Mass Spectrometry: RCM
D J Douglas, N V Konenkov
RATIONALE: For mass analysis, a quadrupole mass filter (QMF) usually operates at the upper tip of the first stability region. We introduce a new mode of QMF operation with dipole dc and with auxiliary quadrupole excitation. Before experimental investigation of this mode, we have done numerical simulations of this process. METHODS: Based on the analytical description of the equations of ion motion and mapping of stability islands, ion trajectory calculations are used to calculate peak shapes or mass filter transmission contours...
August 22, 2018: Rapid Communications in Mass Spectrometry: RCM
A M Alnajeebi, J C Vickerman, N P Lockyer
RATIONALE: The application of mass spectrometry imaging techniques to determine 2D and 3D chemical distribution ideally provides uniform, high sensitivity to multiple components and reliable quantification. These criteria are typically not met due to variations in sensitivity due to the chemistry of the analyte and surrounding surface chemistry. Here we explore the influence of projectile beam chemistry and sample chemistry in time-of-flight secondary ion mass spectrometry (ToF-SIMS)...
August 21, 2018: Rapid Communications in Mass Spectrometry: RCM
Harald John, Michael Rychlik, Horst Thiermann, Christian Schmidt
RATIONALE: Atropine (Atr) and scopolamine (Scp) are toxic secondary plant metabolites of species within the Solanaceae genus that can accidentally or intentionally reach the food store chain by inaccurate harvesting of any plant material e.g. for herbal tea infusions. Ingestion may cause severe anticholinergic poisoning thus requiring risk-oriented determination in food and beverages. The suitability of matrix-assisted laser desorption/ionization time-of-flight (tandem) mass spectrometry, MALDI-TOF MS(/MS), should be characterized for simultaneous analysis...
August 16, 2018: Rapid Communications in Mass Spectrometry: RCM
Ruth N Muchiri, Katarzyna E Kowal, Kenneth Hensley, Douglas L Feinstein, Richard B van Breemen
RATIONALE: Preclinical studies in search of treatments for several neurodegenerative diseases have identified lanthionine ketimine (LK) and its monoethyl ester derivative (LKE) as potential candidates. An ultrahigh-pressure liquid chromatography/tandem mass spectrometry (UHPLC-MS/MS) assay was developed to evaluate bioavailability by measuring these compounds in mouse serum, whole blood and brain tissue. METHODS: Following administration of LKE to mice for 3 days in chow at 300 ppm, the animals were sacrificed, and LKE was extracted from serum, whole blood, and brain tissues through protein precipitation using cold methanol...
August 16, 2018: Rapid Communications in Mass Spectrometry: RCM
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