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Ion mobility spectrometry

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https://www.readbyqxmd.com/read/28641225/investigation-of-dissociation-constants-for-individual-and-total-naphthenic-acids-species-using-ultra-performance-liquid-chromatography-ion-mobility-time-of-flight-mass-spectrometry-analysis
#1
Rongfu Huang, Pamela Chelme-Ayala, Yanyan Zhang, Mohamed Changalov, Mohamed Gamal El-Din
Ultra-performance liquid chromatography ion mobility time-of-flight mass spectrometry (UPLC-IM-TOFMS) was utilized for the analysis of naphthenic acids (NAs) in fractions of pH-dependent sequential liquid-liquid extractions from oil sands process-affected water. Ion-mobility separation technique allowed the differentiation of OyS-NAs (2 ≤ y ≤ 4) from Ox-NAs (2 ≤ x ≤ 5) via drift time versus retention time separations. The results indicated that the addition of S atom to the O2-NA molecule led to a lower increase in the dissociation constant (pKa) compared to that caused by the addition of O atom...
June 18, 2017: Chemosphere
https://www.readbyqxmd.com/read/28636334/interpreting-the-collision-cross-sections-of-native-like-protein-ions-insights-from-cation-to-anion-proton-transfer-reactions
#2
Kenneth J Laszlo, Matthew F Bush
The effects of charge state on structures of native-like cations of serum albumin, streptavidin, avidin, and alcohol dehydrogenase were probed using cation-to-anion proton-transfer reactions (CAPTR), ion mobility, mass spectrometry, and complementary energy-dependent experiments. The CAPTR products all have collision cross section (Ω) values that are within 5.5% of the original precursor cations. The first CAPTR event for each precursor yields products that have smaller Ω values and frequently exhibit the greatest magnitude of change in Ω resulting from a single CAPTR event...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636333/glycosaminoglycan-analysis-by-cryogenic-messenger-tagging-ir-spectroscopy-combined-with-ims-ms
#3
Neelam Khanal, Chiara Masellis, Michael Z Kamrath, David E Clemmer, Thomas R Rizzo
We combine ion mobility spectrometry with cryogenic, messenger-tagging, infrared spectroscopy and mass spectrometry to identify different isomeric disaccharides of chondroitin sulfate (CS) and heparan sulfate (HS), which are representatives of two major subclasses of glycosaminoglycans. Our analysis shows that while CS and HS disaccharide isomers have similar drift times, they can be uniquely distinguished by their vibrational spectrum between ~3200-3700 cm-1 due to their different OH hydrogen-bonding patterns...
June 21, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28636005/mass-mobility-and-ms-n-measurements-of-single-ions-using-charge-detection-mass-spectrometry
#4
Andrew G Elliott, Conner C Harper, Haw-Wei Lin, Evan R Williams
Charge detection mass spectrometry is used to measure the mass, charge, MS(n) and mobility of an individual ion produced by electrospray ionization of a 8 MDa polyethylene glycol sample. The charge detection mass spectrometer is an electrostatic ion trap that uses cone electrodes and a single tube detector and can detect ions for up to the full trapping time of 4.0 s. The time-domain signal induced on the detector tube by a single multiply charged ion can be complex owing to sequential fragmentation of the original precursor ion as well as increasing oscillation frequencies of the single ion owing to collisions with background gas that reduce the kinetic energy of the ion inside the trap...
June 21, 2017: Analyst
https://www.readbyqxmd.com/read/28629940/highly-informative-multiclass-profiling-of-lipids-by-ultra-high-performance-liquid-chromatography-low-resolution-quadrupole-mass-spectrometry-by-using-electrospray-ionization-and-atmospheric-pressure-chemical-ionization-interfaces
#5
Marco Beccaria, Veronica Inferrera, Francesca Rigano, Krzysztof Gorynski, Giorgia Purcaro, Janusz Pawliszyn, Paola Dugo, Luigi Mondello
A simple, fast, and versatile method, using an ultra-high performance liquid chromatography system coupled with a low resolution (single quadrupole) mass spectrometer was optimized to perform multiclass lipid profiling of human plasma. Particular attention was made to develop a method suitable for both electrospray ionization and atmospheric pressure chemical ionization interfaces (sequentially in positive- and negative-ion mode), without any modification of the chromatographic conditions (mobile phase, flow-rate, gradient, etc...
June 8, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28623772/development-and-validation-of-a-highly-sensitive-lc-esi-ms-ms-method-for-estimation-of-iiim-mcd-211-a-novel-nitrofuranyl-methyl-piperazine-derivative-with-potential-activity-against-tuberculosis-application-to-drug-development
#6
Asmita Magotra, Anjna Sharma, Ajai Prakash Gupta, Priya Wazir, Shweta Sharma, Parvinder Pal Singh, Manoj Kumar Tikoo, Ram A Vishwakarma, Gurdarshan Singh, Utpal Nandi
In the present study, a simple, sensitive, specific and rapid liquid chromatography (LC) tandem mass spectrometry (MS/MS) method was developed and validated according to the Food and Drug Administration (FDA) guidelines for estimation of IIIM-MCD-211 (a potent oral candidate with promising action against tuberculosis) in mice plasma using carbamazepine as internal standard (IS). Bioanalytical method consisted of one step protein precipitation for sample preparation followed by quantitation in LC-MS/MS using positive electrospray ionization technique (ESI) operating in multiple reaction monitoring (MRM) mode...
June 8, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28622621/development-of-an-ultra-fast-liquid-chromatography-tandem-mass-spectrometry-method-for-simultaneous-determination-of-seven-flavonoids-in-rat-plasma-application-to-a-comparative-pharmacokinetic-investigation-of-ginkgo-biloba-extract-and-single-pure-ginkgo-flavonoids
#7
Tianyang Wang, Jie Xiao, Huiping Hou, Pei Li, Ziyue Yuan, Huarong Xu, Ran Liu, Qing Li, Kaishun Bi
For deeper pharmacokinetic investigation and further curative application of ginkgo flavonoids, a delicate, efficient and precise UFLC-MS/MS technique for synchronous quantitation of seven flavonoids, apigenin, luteolin, naringenin, quercetin, diosmetin, kaempferol and isorhamnetin in rat plasma has been established. After mixing with the internal standard (IS) linarin, bio-samples were pretreated via ethyl acetate for liquid-liquid extraction, then isolated at 0.2ml/min flow rate on a Venusil MP C18 chromatographic column (100mm×2...
May 30, 2017: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/28621517/simultaneous-measurements-of-mass-and-collisional-cross-section-of-single-ions-with-charge-detection-mass-spectrometry
#8
Andrew G Elliott, Conner C Harper, Haw-Wei Lin, Anna Christine Susa, Zijie Xia, Evan R Williams
The masses and mobilities of single multiply charged ions of cytochrome c, ubiquitin, myoglobin and bovine serum albumin formed by electrospray ionization are measured using charge detection mass spectrometry (CDMS). Single ions are trapped and repeatedly measured as they oscillate inside an electrostatic ion trap with cone electrodes for up to the maximum trapping time set at 500 ms. The histograms of the many single ion oscillation frequencies have resolved peaks that correspond to the different charge states of each protein...
June 16, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28618051/quantitative-bioanalysis-of-bavachalcone-in-rat-plasma-by-lc-ms-ms-and-its-application-in-a-pharmacokinetics-study
#9
Dan Zhou, Lianhua An, Yan Xia, Yuanyi Wang, Xingliang Li
This study aims to develop and validate a simple and sensitive liquid chromatography with tandem mass spectrometry (LC-MS/MS) method for investigating the pharmacokinetic characteristics of bavachalcone. Liquid-liquid extraction was used to prepare plasma sample. Chromatographic separation of bavachalcone and IS was achieved by using a Venusil ASB C18 (2.1 × 50 mm, 5 μm) column with a mobile phase of methanol (A)-water (B) (70:30, v/v). The detection and quantification of analytes was performed in selected-reaction monitoring mode using precursor→product ion combinations of m/z 323...
June 15, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28613874/distinguishing-cis-and-trans-isomers-in-intact-complex-lipids-using-electron-impact-excitation-of-ions-from-organics-eieio-mass-spectrometry
#10
Takashi Baba, J Larry Campbell, J C Yves Le Blanc, Paul R S Baker
We present a mass spectrometry-based method for the identification of cis and trans double bond isomers within intact complex lipid mixtures using Electron Impact Excitation of Ions from Organics (EIEIO) mass spectrometry. EIEIO involves irradiating singly charged lipid ions with electrons having kinetic energies of 5-16 eV. The resulting EIEIO spectra can be used to discern cis and trans double bond isomers by virtue of the differences in the fragmentation patterns at the carbon-carbon single bonds neighboring the double bonds...
June 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28613840/rapid-analysis-of-anabolic-steroid-metabolites-in-urine-by-combining-field-asymmetric-waveform-ion-mobility-spectrometry-with-liquid-chromatography-and-mass-spectrometry
#11
Kayleigh L Arthur, Matthew A Turner, Alan David Brailsford, Andrew Kicman, David A Cowan, James C Reynolds, Colin S Creaser
The combination of field asymmetric waveform ion mobility spectrometry with liquid chromatography-mass spectrometry (LC-FAIMS-MS) has been developed for the analysis of glucuronide and sulfate metabolites of seven anabolic-androgenic steroids AAS in urine. Separation by FAIMS-MS was investigated in positive ion mode for selected cationic adducts (H+, NH4+, Na+, K+, Cs+). LC-FAIMS-MS analysis of the doubly sodiated adducts ([M+2Na-H]+) of isobaric and co-eluting steroid metabolites allowed their rapid (8 min) qualitative and quantitative determination in spiked urine using hydrophilic interaction liquid chromatography prior to FAIMS-MS separation, with discrimination >95% achieved between the steroids investigated...
June 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28612342/effect-of-glycine-nitrogen-on-lettuce-growth-under-soilless-culture-a-metabolomics-approach-to-identify-the-main-changes-occurred-in-plant-primary-and-secondary-metabolism
#12
Xiao Yang, Lei Feng, Li Zhao, Xiaosong Liu, Danial Hassani, Danfeng Huang
BACKGROUND: Lettuce is a significant source of antioxidants and bioactive compounds. Nitrate is a cardinal fertilizer in horticulture and influences vegetable yield and quality; however, the negative effects of nitrate on the biosynthesis of flavonoids require further study. It is expected that using fertilizers containing organic N could promote the synthesis of health-promoting compounds. RESULTS: Lettuces were hydroponically cultured in media containing 9 mM nitrate or 9 mM glycine for 4 weeks...
June 14, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28609672/development-of-a-new-extraction-technique-and-hplc-method-for-the-analysis-of-non-psychoactive-cannabinoids-in-fibre-type-cannabis-sativa-l-hemp
#13
Virginia Brighenti, Federica Pellati, Marleen Steinbach, Davide Maran, Stefania Benvenuti
The present work was aimed at the development and validation of a new, efficient and reliable technique for the analysis of the main non-psychoactive cannabinoids in fibre-type Cannabis sativa L. (hemp) inflorescences belonging to different varieties. This study was designed to identify samples with a high content of bioactive compounds, with a view to underscoring the importance of quality control in derived products as well. Different extraction methods, including dynamic maceration (DM), ultrasound-assisted extraction (UAE), microwave-assisted extraction (MAE) and supercritical-fluid extraction (SFE) were applied and compared in order to obtain a high yield of the target analytes from hemp...
June 4, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28602940/investigation-of-pharmacokinetic-parameters-of-bakuchicin-isolated-from-psoralea-corylifolia-in-mice
#14
Jun Hyeon Jo, Ju-Hyun Kim, Hye Suk Lee, Gil-Saeng Jeong, Jae-Mok Lee, Sangkyu Lee
Bakuchicin is a furanocoumarin isolated from the seeds of Psoralea corylifolia, which is used in oriental medicine. However, limited information on the pharmacokinetics of bakuchicin is available and in addition, no determined method has been devised to quantify bakuchicin levels in the plasma. In the present study, we developed and validated a quantification method using liquid chromatography (LC) coupled with tandem mass spectrometry (LC-MS/MS), which was applied to a pharmacokinetic investigation in mouse plasma...
June 8, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28585116/charge-mediated-compaction-and-rearrangement-of-gas-phase-proteins-a-case-study-considering-two-proteins-at-opposing-ends-of-the-structure-disorder-continuum
#15
Jacquelyn R Jhingree, Bruno Bellina, Kamila J Pacholarz, Perdita E Barran
Charge reduction in the gas phase provides a direct means of manipulating protein charge state, and when coupled to ion mobility mass spectrometry (IM-MS), it is possible to monitor the effect of charge on protein conformation in the absence of solution. Use of the electron transfer reagent 1,3-dicyanobenzene, coupled with IM-MS, allows us to monitor the effect of charge reduction on the conformation of two proteins deliberately chosen from opposite sides of the order to disorder continuum: bovine pancreatic trypsin inhibitor (BPTI) and beta casein...
June 5, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28573208/compaction-of-duplex-nucleic-acids-upon-native-electrospray-mass-spectrometry
#16
Massimiliano Porrini, Frédéric Rosu, Clémence Rabin, Leonardo Darré, Hansel Gómez, Modesto Orozco, Valérie Gabelica
We report on the fate of nucleic acids conformation in the gas phase as sampled using native mass spectrometry coupled to ion mobility spectrometry. On the basis of several successful reports for proteins and their complexes, the technique has become popular in structural biology, and the conformation survival becomes more and more taken for granted. Surprisingly, we found that DNA and RNA duplexes, at the electrospray charge states naturally obtained from native solution conditions (≥100 mM aqueous NH4OAc), are significantly more compact in the gas phase compared to the canonical solution structures...
May 24, 2017: ACS Central Science
https://www.readbyqxmd.com/read/28569908/correction-supramolecular-influence-on-cis-trans-isomerization-probed-by-ion-mobility-spectrometry
#17
Izabella Czerwinska, Alexander Kulesza, Changmin Choi, Fabien Chirot, Anne-Laure Simon, Johann Far, Christopher Kune, Edwin de Pauw, Philippe Dugourd
Correction for 'Supramolecular influence on cis-trans isomerization probed by ion mobility spectrometry' by Izabella Czerwinska et al., Phys. Chem. Chem. Phys., 2016, 18, 32331-32336.
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28560564/an-electrospray-ionization-mass-spectrometry-study-on-the-in-vacuo-hetero-oligomers-formed-by-the-antimicrobial-peptides-surfactin-and-gramicidin-s
#18
Marina Rautenbach, N Maré Vlok, Hans A Eyéghé-Bickong, Marthinus J van der Merwe, Marietjie A Stander
It was previously observed that the lipopeptide surfactants in surfactin (Srf) have an antagonistic action towards the highly potent antimicrobial cyclodecapeptide, gramicidin S (GS). This study reports on some of the molecular aspects of the antagonism as investigated through complementary electrospray ionization mass spectrometry techniques. We were able to detect stable 1:1 and 2:1 hetero-oligomers in a mixture of surfactin and gramicidin S. The noncovalent interaction between GS and Srf, with the proposed equilibrium: GS~Srf↔GS+Srf correlated to apparent K d values of 6-9 μM in gas-phase and 1 μM in aqueous solution...
May 30, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28557007/simultaneous-determination-of-ginsenoside-rb1-ginsenoside-rg1-paeoniflorin-albiflorin-and-oxypaeoniflorin-in-rat-plasma-by-liquid-chromatography-tandem-mass-spectrometry-application-to-a-pharmacokinetic-study-of-wen-yang-huo-xue-soft-capsule
#19
Xiujun Wu, Yang You, Gonglin Qu, Ran Ma, Mingxue Zhang
A simple and sensitive HPLC-MS/MS method was developed and fully validated for simultaneous determination of ginsenoside Rb1, ginsenoside Rg1, paeoniflorin, albiflorin and oxypaeoniflorin in rat plasma. Plasma samples were pretreated with protein precipitation using acetonitrile. The chromatographic separation was carried out on a C18 column with a gradient mobile phase consisting of acetonitrile and water (containing 0.1% formic acid). All analytes and digoxin (internal stand, IS) were quantitated through electrospray ionization in negative ion multiple reaction monitoring (MRM) mode...
May 30, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/28554572/electrospray-ionization-ion-mobility-mass-spectrometry-provides-novel-insights-into-the-pattern-and-activity-of-fetal-hippocampus-gangliosides
#20
Mirela Sarbu, Željka Vukelic, David E Clemmer, Alina D Zamfir
Gangliosides (GGs), a particular class of glycosphingolipids ubiquitously found in tissues and body fluids, exhibit the highest expression in the central nervous system, especially in brain. GGs are involved in crucial processes, such as neurogenesis, synaptogenesis, synaptic transmission, cell adhesion, growth and proliferation. For these reasons, efforts are constantly invested into development and refinement of specific methods for GG analysis. We have recently shown that ion mobility separation (IMS) mass spectrometry (MS) has the capability to provide consistent compositional and structural information on GGs at high sensitivity, resolution and mass accuracy...
May 26, 2017: Biochimie
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