Results 111 to 120 of about 226,974 (153)

Incorporation of a Venturi Device in Electrospray Ionization

Analytical Chemistry, 2003
Electrospray ionization has grown to be one of the most commonly used ionization techniques for mass spectrometry, and efforts continue to improve its performance. Typically, the sprayer tip must be very close to the entrance orifice of the mass spectrometer in order to maximize the conduction of ions from the sprayer into the mass spectrometer ...
Li, Zhou, Bingfang, Yue, David V, Dearden, Edgar D, Lee, Alan L, Rockwood, Milton L, Lee   +5 more
openaire   +2 more sources

Desorption electrospray ionization of aerosol particles

Rapid Communications in Mass Spectrometry, 2007
Abstract We have applied desorption electrospray ionization to aerosol particles. Ions were formed from aerosols by merging suspended dry particles with an electrospray of solvent in a modified ion trap mass spectrometer. Dry aerosol particles were generated using a fluidized bed powder disperser and directed toward the inlet of the ...
Jianan, Dong, Yohannes H, Rezenom, Kermit K, Murray   +2 more
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Internal energy distribution in electrospray ionization

Journal of Mass Spectrometry, 2004
Abstract Internal energies and energy distributions were studied using the ‘survival yield’ method developed previously. In addition to conventional benzylpyridinium salts, protonated esters (fragmenting by rearrangement) and protonated leucine enkephalin were also used, extending the validity of the technique. Fragmentation processes
Naban-Maillet, J., Lesage, D., Bossee, A., Gimbert, Y., Sztaray, J., Vekey, K., Tabet, J.-C.   +6 more
openaire   +3 more sources

Electrospray ionization mass spectrometry of ginsenosides

Journal of Mass Spectrometry, 2002
AbstractGinsenosides Rb1, Rb2, Rc, Rd, Re, Rf, Rg1, Rg2 and F11 were studied systematically by electrospray ionization mass spectrometry in positive‐ and negative‐ion modes with a mobile‐phase additive, ammonium acetate. In general, ion sensitivities for the ginsenosides were greater in the negative‐ion mode, but more structural information on the ...
Xiu-Sheng, Miao, Chris D, Metcalfe, Chunyan, Hao, Raymond E, March   +3 more
openaire   +2 more sources

Electrospray-ionization driven by dielectric polarization

Analytical and Bioanalytical Chemistry, 2008
A non-conductive piezo ceramic plate has been used to induce an electric field to generate an electrospray as ionization method for mass spectrometric determination. This technique decreases the risk of undesired discharges, induced by high electric currents. The applicability of the technique is demonstrated and compared with a commercial electrospray
Michael, Schilling, Dirk, Janasek, Joachim, Franzke   +2 more
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Electrospray Ionization Using Wooden Tips

Analytical Chemistry, 2011
Electrospray ionization (ESI) is a mass spectrometric technique widely used in various fields including chemistry, biology, medicine, pharmaceutical industry, clinical assessment, and forensic science. In this study, we report a simple and economical ESI-mass spectrometry (MS) technique, which makes use of disposable wooden tips (wooden toothpicks) for
Bin, Hu, Pui-Kin, So, Huanwen, Chen, Zhong-Ping, Yao   +3 more
openaire   +2 more sources

The Charging of Micellar Nanoparticles in Electrospray Ionization

ChemPhysChem, 2013
AbstractCharging of nanoparticles through electrospray has scarcely been explored. Spherical nanometer‐sized amphiphilic block copolymer nanoparticles with diameters ranging from ∼65 to ∼150 nm were electrosprayed and analysed by charge detection spectrometry. Herein, we explore the charging of these micellar nano‐objects by conducting a thorough study
Doussineau, Tristan, Santacreu, Marion, Antoine, Rodolphe, Dugourd, Philippe, Zhang, Wenjing, Chaduc, Isabelle, Lansalot, Muriel, d'Agosto, Franck, Charleux, Bernadette   +8 more
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Electrospray ionization source with a rear extractor

Journal of Mass Spectrometry, 2018
AbstractA new electrospray source design is introduced by having an extractor electrode placed at 1 to 2 mm behind the emitter tip. The extractor was integrated into the sprayer body as a single device. An insulating tube was used to isolate the emitter from the extractor and to deliver the sheath gas for the electrospray.
Lee Chuin Chen, Satoru Tsutsui, Tsubasa Naito, Satoshi Ninomiya, Kenzo Hiraoka   +4 more
openaire   +2 more sources

Electrospray Ionization Mass Spectrometry of Oligonucleotides

Current Protocols in Nucleic Acid Chemistry, 2008
AbstractBecause of the high molecular weights and thermal lability of biomolecules such as nucleic acids and protein, they can be difficult to analyze by mass spectrometry. Such analyses require a “soft” ionization method that is capable of generating intact molecular ions.
Colette M, Castleberry, Lenore P, Rodicio, Patrick A, Limbach   +2 more
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Integration of electropreconcentration and electrospray ionization in a microchip

Journal of Chromatography A, 2018
A microfluidic glass chip for performing sensitive mass spectrometry (MS) is developed by integrating nanochannel-based electropreconcentration with electrospray ionization (ESI). Cation analytes in acidic buffer conditions (∼pH 3) were preconcentrated at a micro-nano-microchannel junction where a positively charged polymer, polyE-323, is coated to ...
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