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Journal articles on the topic 'Ion chromatography/ Mass Spectrometry'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Castro, Rocio, Encarnación Moyano, and Maria Teresa Galceran. "Determination of Chlormequat in Fruit Samples by Liquid Chromatography-Electrospray-Mass Spectrometry/Mass Spectrometry." Journal of AOAC INTERNATIONAL 84, no. 6 (2001): 1903–8. http://dx.doi.org/10.1093/jaoac/84.6.1903.

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Abstract An ion-pair liquid chromatography-mass spectrometry/mass spectrometry method was developed for the determination of chlormequat in fruit samples. A solid-phase extraction cleanup procedure with C18 cartridges was used. Sample preparation was simple and the achieved detection limit (0.03 mg/kg) and quantitation limit (0.08 mg/kg) were below the maximum residue levels legislated by the European Union. The chromatographic separation was performed by using a C8 column and heptafluorobutyric acid as ion pair reagent. The detection was conducted with an electrospray source and an ion trap a

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2

Chen, Wen-Ling, Tzu-Fang Hsu, and Chia-Yang Chen. "Performance Liquid Chromatography/Tandem Mass Spectrometry." Journal of AOAC INTERNATIONAL 94, no. 3 (2011): 872–77. http://dx.doi.org/10.1093/jaoac/94.3.872.

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Abstract A sensitive method was developed using ultra-high-performance liquid chromatography (UHPLC)/MS/MS with positive electrospray ionization for determining aflatoxin M1 (AFM1) in milk and milk powder. A 50 mL quantity of low-fat liquid milk containing 100 ng/L AFM1 was prepared using immunoaffinity columns with a mean recovery rate of 79% (n = 3). UHPLC columns (BEH C18, BEH HILIC, and HSS T3) greatly reduced the chromatographic time and lowered the instrumental detection limits (IDLs) 16 to 58 times compared to an HPLC column (Betabasic C18). The HSS T3 column was chosen because it provi

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3

Donnelly, J. R., G. W. Sovocool, and R. K. Mitchum. "Ion Abundance Criteria for Gas Chromatographic/Mass Spectrometric Environmental Analysis." Journal of AOAC INTERNATIONAL 71, no. 2 (1988): 434–39. http://dx.doi.org/10.1093/jaoac/71.2.434.

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Abstract Mass and intensity calibration of gas chromatograph/mass spectrometer (GC/MS) responses is an important quality assurance issue for chemical analysis. Ion abundance calibration with decafluorotriphenylphosphine (DFTPP) was applied in 1975 to standardize quadrupole spectra to resemble the ion abundances that were obtainable from magnetic sector mass spectrometers. Modern &lt;j uadrupole mass spectrometers provide significantly greater high-mass sensitivity than allowed under the 1975 study. Thus, those recommendations were reevaluated with 2 approaches. First, an interlaboratory st

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4

Sauvage, François-Ludovic, Franck Saint-marcoux, Bénédicte Duretz, Didier Deporte, Gérard Lachatre, and Pierre Marquet. "Screening of Drugs and Toxic Compounds with Liquid Chromatography-Linear Ion Trap Tandem Mass Spectrometry." Clinical Chemistry 52, no. 9 (2006): 1735–42. http://dx.doi.org/10.1373/clinchem.2006.067116.

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Abstract Background: In clinical and forensic toxicology, general unknown screening is used to detect and identify exogenous compounds. In this study, we aimed to develop a comprehensive general unknown screening method based on liquid chromatography coupled with a hybrid triple-quadrupole linear ion trap mass spectrometer. Methods: After solid-phase extraction, separation was performed using gradient reversed-phase chromatography. The mass spectrometer was operated in the information-dependent acquisition mode, switching between a survey scan acquired in the Enhanced Mass Spectrometry mode wi

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5

Garcia, Xavier, Maria Sabaté, Jorge Aubets, Josep Jansat, and Sonia Sentellas. "Ion Mobility–Mass Spectrometry for Bioanalysis." Separations 8, no. 3 (2021): 33. http://dx.doi.org/10.3390/separations8030033.

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This paper aims to cover the main strategies based on ion mobility spectrometry (IMS) for the analysis of biological samples. The determination of endogenous and exogenous compounds in such samples is important for the understanding of the health status of individuals. For this reason, the development of new approaches that can be complementary to the ones already established (mainly based on liquid chromatography coupled to mass spectrometry) is welcomed. In this regard, ion mobility spectrometry has appeared in the analytical scenario as a powerful technique for the separation and characteri

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6

Braselton, W. Emmett, Regg D. Neiger, and Robert H. Poppenga. "Confirmation of Indandione Rodenticide Toxicoses by Mass Spectrometry/Mass Spectrometry." Journal of Veterinary Diagnostic Investigation 4, no. 4 (1992): 441–46. http://dx.doi.org/10.1177/104063879200400413.

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Mass spectrometry/mass spectrometry (MS/MS) with collision-activated dissociation (CAD) was utilized to unequivocally distinguish 1,3-indandione rodenticides in 2 cases of anticoagulant toxicosis. Anecdotal evidence provided by the veterinarian in a case involving feedlot cows and physical evidence at the site of occurrence in a similar case involving lambs strongly implicated diphenadione (diphacinone; DP) in both instances. However, high performance liquid chromatography indicated chlorophacinone (CP), not DP, was present in the blood samples obtained from both cows and lambs. Intact 1,3-ind

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7

Catinella, Silvia, Pietro Traldi, Xuewu Jiang, et al. "Negative-ion mass spectrometry in a commercial gas chromatography/ion-trap mass spectrometer system." Rapid Communications in Mass Spectrometry 9, no. 13 (1995): 1302–9. http://dx.doi.org/10.1002/rcm.1290091316.

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8

Botek, P., J. Poustka, and J. Hajšlová. "Determination of banned dyes in spices by liquid chromatography−mass spectrometry." Czech Journal of Food Sciences 25, No. 1 (2008): 17–24. http://dx.doi.org/10.17221/737-cjfs.

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A simple and rapid multiresidue method for the determination of nine banned synthetic dyes in various spices has been developed. Reversed phase HPLC coupled with mass spectrometry (tandem in time&minus;ion trap mass analyser) was employed for the examination of crude acetonitrile extract acidified with acetic acid. The detection limits of Para Red, Sudan Orange G, Sudan I, Sudan II, Sudan III, Sudan IV, Sudan Red 7B and Rhodamine B were in the range of 0.02&minus;0.1 mg/kg, the recoveries ranged from 75.7&minus;92.3% with repeatability of 0.9&minus;11.3%. Rather worse performan

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9

Loftus, Neil. "Gold standard: Mass spectrometry and chromatography." Biochemist 24, no. 1 (2002): 25–27. http://dx.doi.org/10.1042/bio02401025.

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Mass spectrometry (MS) interfaced with liquid chromatography (LC) was once considered a technology that was reserved for rather specific applications that appeared to work in sequence with the phases of the moon. Early adventures with thermospray and particle beam interfaces proved to be of limited use, and it was not until atmospheric pressure ionization established itself that we could regard LC–MS as the analytical tool of choice for a considerable range of challenges. Indeed, advances in source design and increased ion transmission have presented a new generation of instruments that use hy

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10

Kaiser, Raymond E., Jon D. Williams, Stephen A. Lammert, R. Graham Cooks, and Don Zakett. "Thermospray liquid chromatography—mass spectrometry with a quadrupole ion trap mass spectrometer." Journal of Chromatography B: Biomedical Sciences and Applications 562, no. 1-2 (1991): 3–11. http://dx.doi.org/10.1016/0378-4347(91)80559-u.

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11

Song, Ki-Cheol, Ka-Jeong Lee, Ji-Hoe Kim, Ho-Dong Yoon, Hong-Sik Yu, and Jong-Soo Mok. "Tetramine Analysis using Liquid Chromatography-Tandem Mass Spectrometry and Ion Chromatography." Korean Journal of Fisheries and Aquatic Sciences 44, no. 1 (2011): 45–49. http://dx.doi.org/10.5657/kfas.2011.44.1.045.

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12

Mol, Hans G. J., Ruud C. J. Van Dam, Rob J. Vreeken, and Odile M. Steijger. "Determination of Chlormequat in Pears by Liquid Chromatography/Mass Spectrometry." Journal of AOAC INTERNATIONAL 83, no. 3 (2000): 742–47. http://dx.doi.org/10.1093/jaoac/83.3.742.

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Abstract A straightforward and reliable method was developed for the determination of chlormequat in pears by liquid chromatography/mass spectrometry (LC/MS). Water and methanol were compared as extraction solvents. Because no significant differences in extraction efficiency or repeatability were found, water was chosen as the extraction solvent. The extracts were analyzed without cleanup by either an ion-trap liquid chromatograph/mass spectrometer in the single MS mode or a triple-quadrupole instrument in the MS/MS mode, using electrospray ionization. Both instruments were equally suitable fo

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13

Hopfgartner, Gerard, Timothy Wachs, Karen Bean, and Jack Henion. "High-flow ion spray liquid chromatography/mass spectrometry." Analytical Chemistry 65, no. 4 (1993): 439–46. http://dx.doi.org/10.1021/ac00052a021.

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14

Kemmo, S., V. Ollilainen, Lampi A-M, and V. Piironen. "Determination of stigmasterol hydroperoxides using high-performance liquid chromatography-mass spectrometry with atmospheric pressure chemical ionization." Czech Journal of Food Sciences 22, SI - Chem. Reactions in Foods V (2004): S144—S146. http://dx.doi.org/10.17221/10639-cjfs.

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A new specific method using high-performance liquid chromatography-mass spectrometry (HPLC-MS) for the detection of stigmasterol hydroperoxides was developed. Hydroperoxides of stigmasterol were obtained by photo-oxidation (90 min) in the presence of methylene blue as a sensitizer. The separation was performed using normal-phase chromatographic conditions. The MS detection was carried out with an ion-trap mass spectrometer using atmospheric pressure chemical ionization (APCI) and positive ion mode. Stigmasterol hydroperoxides were seen to produce no protonated molecular ions [M + H]<sup>

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15

Grabarics, Márkó, Maike Lettow, Ansgar T. Kirk, Gert von Helden, Tim J. Causon, and Kevin Pagel. "Plate-height model of ion mobility-mass spectrometry." Analyst 145, no. 19 (2020): 6313–33. http://dx.doi.org/10.1039/d0an00433b.

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16

Schneider, Robert J., J. M. Hayes, Karl F. Von Reden, Ann P. McNichol, T. J. Eglinton, and J. S. C. Wills. "Target Preparation for Continuous Flow Accelerator Mass Spectrometry." Radiocarbon 40, no. 1 (1997): 95–102. http://dx.doi.org/10.1017/s0033822200017938.

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For very small samples, it is difficult to prepare graphitic targets that will yield a useful and steady sputtered ion beam. Working with materials separated by preparative capillary gas chromatography, we have succeeded with amounts as small as 20 μg C. This seems to be a practical limit, as it involves 1) multiple chromatographic runs with trapping of effluent fractions, 2) recovery and combustion of the fractions, 3) graphitization and 4) compression of the resultant graphite/cobalt matrix into a good sputter target. Through such slow and intricate work, radiocarbon ages of lignin derivativ

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17

Tateo, F., M. Bononi, and F. Gallone. "Rapid detection of dimethyl yellow dye in curry by liquid chromatography-electrospray-tandem mass spectrometry." Czech Journal of Food Sciences 28, No. 5 (2010): 427–32. http://dx.doi.org/10.17221/135/2009-cjfs.

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An accurate and rapid method, was devised for the identification and quantitation of dimethyl yellow dye in curry, based on liquid chromatography-tandem mass spectrometry interfaced with electrospray. Mass spectral acquisition was done in positive ion mode applying two fragmentation transitions to provide a high degree of selectivity. The extraction system provided a very high recovery (100.0% to 105.8%) and good results were obtained for the limit of detection (5 &mu;g/kg) and limit of quantitation (16 &mu;g/kg). The applicability of the method to identifing and quantifing the unautho

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18

Loos, Glenn, Ann Van Schepdael, and Deirdre Cabooter. "Quantitative mass spectrometry methods for pharmaceutical analysis." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 374, no. 2079 (2016): 20150366. http://dx.doi.org/10.1098/rsta.2015.0366.

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Quantitative pharmaceutical analysis is nowadays frequently executed using mass spectrometry. Electrospray ionization coupled to a (hybrid) triple quadrupole mass spectrometer is generally used in combination with solid-phase extraction and liquid chromatography. Furthermore, isotopically labelled standards are often used to correct for ion suppression. The challenges in producing sensitive but reliable quantitative data depend on the instrumentation, sample preparation and hyphenated techniques. In this contribution, different approaches to enhance the ionization efficiencies using modified s

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19

Kock, Ruediger, Bert Delvoux, and Helmut Greiling. "Determination of total cholesterol in serum by liquid chromatography–isotope dilution mass spectrometry." Clinical Chemistry 43, no. 10 (1997): 1896–903. http://dx.doi.org/10.1093/clinchem/43.10.1896.

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Abstract We have developed a liquid chromatography–isotope dilution mass spectrometry procedure to quantify total cholesterol in serum. A particle-beam interface was used for coupling the liquid chromatograph and the mass spectrometer. After electron impact ionization the ions m/z = 386 and m/z = 389 were used for selective ion monitoring of cholesterol and the internal standard [25,26,27-13C]cholesterol. The sample preparation steps required for serum materials are alkaline hydrolysis and an extraction of the cholesterol into the cyclohexane phase. Imprecision for the determination of cholest

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20

Quéméner, Bernard, Cédric Désiré, Marc Lahaye, Laurent Debrauwer, and Luc Negroni. "Structural Characterisation by Both Positive- and Negative-Ion Electrospray Mass Spectrometry of Partially Methyl-Esterified Oligogalacturonides Purified by Semi-Preparative High-Performance Anion-Exchange Chromatography." European Journal of Mass Spectrometry 9, no. 1 (2003): 45–60. http://dx.doi.org/10.1255/ejms.526.

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The off-line coupling of high-performance anion-exchange chromatography (HPAEC) to electrospray ionisation/ion trap mass spectrometry (ESI-ITMS) is described. The Dionex carbohydrate membrane desalter (CMD) has been assessed as an on-line chromatographic desalting system to remove the high sodium concentration necessary for the HPAEC separation of partially methyl-esterified oligogalacturonides. The developed HPAEC configuration proved to be suitable for indirect coupling with ESI-ITMS. This paper provides some interesting features of positive- and negative-ion multistage tandem mass spectrome

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21

McLuckey, Scott A., Gary J. Van Berkel, Gary L. Glish, Eric C. Huang, and Jack D. Henion. "Ion spray liquid chromatography/ion trap mass spectrometry determination of biomolecules." Analytical Chemistry 63, no. 4 (1991): 375–83. http://dx.doi.org/10.1021/ac00004a015.

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22

Fordham, P. J., J. Chamot-Rooke, E. Giudice, J. Tortajada, and J. P. Morizur. "Analysis of alkenes by copper ion chemical ionization gas chromatography/mass spectrometry and gas chromatography/tandem mass spectrometry." Journal of Mass Spectrometry 34, no. 10 (1999): 1007–17. http://dx.doi.org/10.1002/(sici)1096-9888(199910)34:10<1007::aid-jms854>3.0.co;2-e.

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23

Hoenicke, K., H. Fritz, R. Gatermann, and S. Weidemann. "Analysis of furan in different foodstuffs using gas chromatography mass spectrometry." Czech Journal of Food Sciences 22, SI - Chem. Reactions in Foods V (2004): S357—S358. http://dx.doi.org/10.17221/10702-cjfs.

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24

DiDonato, Gerald C., and Kenneth L. Busch. "Phase-transition matrix for chromatography/secondary ion mass spectrometry." Analytical Chemistry 58, no. 14 (1986): 3231–32. http://dx.doi.org/10.1021/ac00127a067.

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25

Gee, Andrew J., Lisa A. Groen, and Mitchell E. Johnson. "Ion trap mass spectrometry of trimethylsilylamides following gas chromatography." Journal of Mass Spectrometry 35, no. 3 (2000): 305–10. http://dx.doi.org/10.1002/(sici)1096-9888(200003)35:3<305::aid-jms917>3.0.co;2-z.

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26

Henriksen, Jens, Peter Roepstorff, and Lene Hoffmeyer Ringborg. "Ion-pairing reversed-phased chromatography/mass spectrometry of heparin." Carbohydrate Research 341, no. 3 (2006): 382–87. http://dx.doi.org/10.1016/j.carres.2005.11.030.

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27

Mathew, Johnson, Jay Gandhi, and Joe Hedrick. "Trace level perchlorate analysis by ion chromatography–mass spectrometry." Journal of Chromatography A 1085, no. 1 (2005): 54–59. http://dx.doi.org/10.1016/j.chroma.2005.05.015.

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28

Boison, Joe O., and Lily J.-Y. Keng. "Determination of Sulfadimethoxine and Sulfamethazine Residues in Animal Tissues by Liquid Chromatography and Thermospray Mass Spectrometry." Journal of AOAC INTERNATIONAL 78, no. 3 (1995): 651–58. http://dx.doi.org/10.1093/jaoac/78.3.651.

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Abstract A simple, sensitive, and rapid method for simultaneous determination of sulfamethazine and sulfadimethoxine residues in animal tissues by liquid chromatography (LC) with on-line confirmation by thermospray mass spectrometry is reported. Tissue extracts, after cleanup on C18 cartridges, were injected into a reversed-phase C18 column, and the sulfa drugs were determined by ultraviolet (UV) detection at 265 nm. On-line confirmation of sulfamethazine and sulfadimethoxine in the extracts by mass spectrometry was obtained by feeding the sulfa drugs eluting from the chromatographic column af

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29

McIntyre, Cameron P., Ernst Galutschek, Mark L. Roberts, Karl F. von Reden, Ann P. McNichol, and William J. Jenkins. "A Continuous-Flow Gas Chromatography 14C Accelerator Mass Spectrometry System." Radiocarbon 52, no. 2 (2010): 295–300. http://dx.doi.org/10.1017/s0033822200045331.

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Gas-accepting ion sources for radiocarbon accelerator mass spectrometry (AMS) have permitted the direct analysis of CO2 gas, eliminating the need to graphitize samples. As a result, a variety of analytical instruments can be interfaced to an AMS system, processing time is decreased, and smaller samples can be analyzed (albeit with lower precision). We have coupled a gas chromatograph to a compact 14C AMS system fitted with a microwave ion source for real-time compound-specific 14C analysis. As an initial test of the system, we have analyzed a sample of fatty acid methyl esters and biodiesel. P

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30

Wilson, Roger T., Joseph M. Groneck, Kathleen P. Holland, and A. Carolyn Henry. "Determination of Clenbuterol in Cattle, Sheep, and Swine Tissues by Electron Ionization Gas Chromatography/Mass Spectrometry." Journal of AOAC INTERNATIONAL 77, no. 4 (1994): 917–24. http://dx.doi.org/10.1093/jaoac/77.4.917.

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Abstract A gas chromatographic/mass spectrometric procedure is described for the quantitation and confirmation of clenbuterol residues from cattle, sheep, and swine tissues. After liquid–liquid extraction and derivatization with phosgene in an aqueous pH 10.1 buffer, the cyclic oxazolidone derivative is quantitated with a clenbuterol analogue as internal standard (NAB-760 CI). Confirmation is accomplished by comparison of ion ratios with those of a pure synthesized standard of clenbuterol oxazolidin-3-one obtained by selected ion monitoring, electron ionization gas chromatography/mass spectrom

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31

Metzger, Jörg W., Karl-Heinz Wiesmüller, Volker Gnau, Jente Brünjes, and Günther Jung. "Ion-Spray Mass Spectrometry and High-Performance Liquid Chromatography—Mass Spectrometry of Synthetic Peptide Libraries." Angewandte Chemie International Edition in English 32, no. 6 (1993): 894–96. http://dx.doi.org/10.1002/anie.199308941.

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32

Pinkston, J. David, Thomas E. Delaney, Kenneth L. Morand, and R. Graham Cooks. "Supercritical fluid chromatography/mass spectrometry using a quadrupole mass filter/quadrupole ion trap hybrid mass spectrometer with external ion source." Analytical Chemistry 64, no. 14 (1992): 1571–77. http://dx.doi.org/10.1021/ac00038a013.

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33

Kilanowska, Anna, Łukasz Nuckowski, and Sylwia Studzińska. "Studying in vitro metabolism of the first and second generation of antisense oligonucleotides with the use of ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry." Analytical and Bioanalytical Chemistry 412, no. 27 (2020): 7453–67. http://dx.doi.org/10.1007/s00216-020-02878-0.

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Abstract The aim of the present investigation was the analysis and identification of antisense oligonucleotide metabolism products after incubation with human liver microsomes regarding four different oligonucleotide modifications. Separation and detection methods based on the use of liquid chromatography coupled with quadrupole time-of-flight mass spectrometry were developed for this purpose. Firstly, the optimization of mass spectrometer parameters was done to select those which ensure the highest possible sensitivity of oligonucleotide analysis. This step was conducted for two chromatograph

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34

Miroshnichenko, I. I., and Y. E. Shilov. "Analysis of Biological Samples in a Contemporary Laboratory Practice (Review)." Drug development & registration 8, no. 2 (2019): 115–20. http://dx.doi.org/10.33380/2305-2066-2019-8-2-115-120.

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Introduction. In the present publication highlights the key points of the main stages of development of methods for determining trace amounts of drugs and metabolites in biological samples using chromatographic and chromatography-mass spectrometry methods. The main sources of errors are specified. The main attention is paid to chromatography-mass spectrometry, which is the basic method of analysis of small molecules in biological samples. Examples from literary sources and authors' own practice are given.Text. The review highlights some of the practical issues of preparation of calibration sam

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35

Carling, Rachel S., Benjamin AC McDonald, Donna Austin, et al. "Challenging the status quo: A comparison of ion exchange chromatography with liquid chromatography–mass spectrometry and liquid chromatography–tandem mass spectrometry methods for the measurement of amino acids in human plasma." Annals of Clinical Biochemistry: International Journal of Laboratory Medicine 57, no. 4 (2020): 277–90. http://dx.doi.org/10.1177/0004563220933303.

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Background Plasma amino acid analysis is key to the diagnosis and monitoring of inherited disorders of amino acid synthesis, catabolism and transport. Ion exchange chromatography (IEC) is widely accepted as the gold standard method of analysis, but with the introduction of liquid chromatography tandem mass spectrometry (LC-MS/MS) and liquid chromatography mass spectrometry (LC-MS) methods, this should now be questioned. Methods The analytical performance of three commercially available reagent kits, Waters AccQ Tag™ ULTRA LC-MS, SpOtOn Amino Acids LC-MS/MS and Chromsystems MassChrom® Amino Aci

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Grard, S., C. Elfakir та M. Dreux. "Analysis of sulfobutyl ether-β-cyclodextrin mixtures by ion-spray mass spectrometry and liquid chromatography–ion-spray mass spectrometry". Journal of Chromatography A 925, № 1-2 (2001): 79–87. http://dx.doi.org/10.1016/s0021-9673(01)01007-x.

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Du, Jialin, Can Gong, Xingli Pei, Haiyan Zhao, and Xu Xu. "Analysis of Triacylglycerols in Castor Oil Through Liquid Chromatography–Mass Spectrometry Based on Fourier Transform–Ion Cyclotron Resonance–Mass Spectrometry and Gas Chromatography–Mass Spectrometry." Journal of Chromatographic Science 57, no. 2 (2018): 108–15. http://dx.doi.org/10.1093/chromsci/bmy088.

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38

Garbis, Spiros D., Luke Hanley, and Shelley Kalita. "Detection of Thiazide-Based Diuretics in Equine Urine by Liquid Chromatography/Mass Spectrometry." Journal of AOAC INTERNATIONAL 81, no. 5 (1998): 948–57. http://dx.doi.org/10.1093/jaoac/81.5.948.

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Abstract Thiazide-based diuretics are included in the list of banned drugs in the horse-racing industry. One effect of their misuse is increased urine flow, contributing to dilution of other doping agents. Their determination is essential in ensuring compliance to horse-racing regulation. This study evaluates the feasibility of using liquid chromatography/mass spectrometry (LC/MS) with electrospray and atmospheric pressure chemical ionization interfaces to analyze thiazidic diuretics in equine urine samples. Existing LC and gas chromatography/MS methods are limited in their applicability to th

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Greenwood, P. F., and N. Sherwood. "A REVIEW: ORGANIC GEOCHEMICAL STUDIES BY LASER PYROLYSIS MASS–SPECTROMETRY AND HOW THEY COMPARE WITH FLASH PYROLYSIS MASS–SPECTROMETRY STUDIES." APPEA Journal 35, no. 1 (1995): 633. http://dx.doi.org/10.1071/aj94038.

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Various methods of laser pyrolysis have been used by researchers to investigate at a molecular level the chemistry of dispersed organic matter. An understanding of molecular composition is important for evaluations of oil generation potential and maturation levels of source rocks. Laser-based pyrolysis-mass spectrometry studies as applied to petroleum source rocks and coals are reviewed. Experiments undertaken to date involve three main techniques: (i) laser ionisation-mass spectrometry; (ii) laser pyrolysis-gas chromatography-mass spectrometry; and (iii) laser desorption-electron im-pact-mass

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40

Marwah, Padma, Ashok K. Marwah, and Paul V. Zimba. "Controlling formation of metal ion adducts and enhancing sensitivity in Liquid Chromatography Mass Spectrometry." Journal of Applied and Natural Science 12, no. 2 (2020): 180–92. http://dx.doi.org/10.31018/jans.vi.2277.

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Formation of metal ion adducts in mass spectrometry, particularly in electrospray ionization liquid chromatography mass spectrometry (ESI-LC-MS), is a nightmare scenario for an analyst dealing with quantitative analysis. We have studied in detail the metal adduct formation and concluded that the use of fluorinated alkanoic acids along with formic acid and volatile ammonium salts was extremely useful in suppressing metal adduct formation in positive ion mode of ESI-LC-MS. The extremely high electronegativity of fluorine atom and unique electrostatic nature of C—F bond coupled with stereo-electr

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Takatsuki, Keigo, and Tadashi Kikuchi. "Gas Chromatographic-Mass Spectrometric Determination of Six Sulfonamide Residues in Egg and Animal Tissues." Journal of AOAC INTERNATIONAL 73, no. 6 (1990): 886–92. http://dx.doi.org/10.1093/jaoac/73.6.886.

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Abstract A gas chromatographlc-mass spectrometric method using selected Ion monitoring mode for simultaneous determination of 6 sulfonamides in egg and edible animal tissues has been developed. Sulfonamides are extracted from a sample with acetonltrlle. The extract Is passed through a silica cartridge column and concentrated. Dlazomethane in ether Is added to methylate sulfonamides. After evaporation, the residue Is dissolved In methylene chloride and cleaned up by silica gel column chromatography. The methylene chloride eluate containing sulfonamide-methyl derivatives Is evaporated to dryness

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Papadopoulou-Mourkidou, Euphemia, John Patsias, and Athena Kotopoulou. "Determination of Pesticides in Soils by Gas Chromatography-Ion Trap Mass Spectrometry." Journal of AOAC INTERNATIONAL 80, no. 2 (1997): 447–54. http://dx.doi.org/10.1093/jaoac/80.2.447.

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Abstract A multiresidue method is reported for determination of a variety of chemical classes of pesticides (organochlorines, organophosphates, triazines, phenylureas, acetanilides, pyrethroids, carbamates, and miscellaneous others) in soils. Soil samples are extracted with an acetonitrile-water mixture, and the pesticides are partitioned into petroleum ether-diethyl ether for direct analysis by gas chromatography-ion trap mass spectrometry (GC-ITMS) with the mass spectrometer operated in the electron ionization mode. Recovery values determined for a fortification range of 20–1000 ppb were &am

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ZHOU, Hongbin, Zhiyu XIONG, Ping LI, Jing LI, Li SUN, and Yunxia ZHAO. "Determination of alditols in foods by ion chromatography-mass spectrometry." Chinese Journal of Chromatography 31, no. 11 (2013): 1093. http://dx.doi.org/10.3724/sp.j.1123.2013.05008.

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Dauphas, Nicolas, Laurie Reisberg, and Bernard Marty. "Solvent Extraction, Ion Chromatography, and Mass Spectrometry of Molybdenum Isotopes." Analytical Chemistry 73, no. 11 (2001): 2613–16. http://dx.doi.org/10.1021/ac000998g.

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Duffin, Kevin L., Rick A. Flurer, Kenneth L. Busch, Larry W. Sexton, and John L. Dorsett. "Automated sample transport system for chromatography/secondary ion mass spectrometry." Review of Scientific Instruments 60, no. 6 (1989): 1071–74. http://dx.doi.org/10.1063/1.1140319.

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Todd, J. F. J., I. C. Mylchreest, A. J. Berry, D. E. Games, R. D. Smith, and J. R. Chapman. "Supercritical fluid chromatography/mass spectrometry with an ion trap detector." Rapid Communications in Mass Spectrometry 2, no. 3 (1988): 55–58. http://dx.doi.org/10.1002/rcm.1290020305.

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Alexander, James N., and Chad J. Quinn. "Organic acid analysis by ion chromatography—particle beam mass spectrometry." Journal of Chromatography A 647, no. 1 (1993): 95–100. http://dx.doi.org/10.1016/0021-9673(93)83328-p.

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Henion, Jack D. "The Origins of Ion Spray Liquid Chromatography–Tandem Mass Spectrometry." Clinical Chemistry 55, no. 6 (2009): 1234–35. http://dx.doi.org/10.1373/clinchem.2009.126193.

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Farrar-Khan, J. R., G. E. Andrews, R. Ishaq, P. T. Williams, and K. D. Battle. "Quantitative Diesel Particulate Analysis Using Gas Chromatography/Mass Spectrometry." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 207, no. 2 (1993): 95–106. http://dx.doi.org/10.1243/pime_proc_1993_207_018_02.

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Detailed analysis of the composition of diesel particulate solvent organic fraction (SOF) is difficult for low-level polycyclic aromatic hydrocarbons (PAH) and generally requires pre-separation of aromatic and aliphatic compounds. This is usually done using either on-line or off-line high performance liquid chromatography (HPLC) which complicates the SOF analysis. Without pre-separation of the samples the gas chromatography (GC) cannot resolve the low-level PAH in the presence of higher levels of n-alkanes and other compounds, which may co-elute. A Finnegan Mat ion trap mass spectrometry (MS)

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Annesley, Thomas M. "Ion Suppression in Mass Spectrometry." Clinical Chemistry 49, no. 7 (2003): 1041–44. http://dx.doi.org/10.1373/49.7.1041.

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Abstract Background: Mass spectrometry (MS) is being introduced into a large number of clinical laboratories. It provides specificity because of its ability to monitor selected mass ions, sensitivity because of the enhanced signal-to-noise ratio, and speed because it can help avoid the need for intensive sample cleanup and long analysis times. However, MS is not without problems related to interference, especially through ion suppression effects. Ion suppression results from the presence of less volatile compounds that can change the efficiency of droplet formation or droplet evaporation, whic

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