Results 261 to 270 of about 553,070 (330)

Electrospray ionization tandem mass spectrometry of chaetoglobosins

Rapid Communications in Mass Spectrometry, 2012
RATIONALEChaetoglobosins are a family of macrocyclic polyketide alkaloids. They possess many similar isomers and exhibit a wide range of biological activities. Thus, there is a need for reliable, fast, and low‐cost analysis of this class of compounds.METHODSA series of seven chaetoglobosins from Chaetomium globosum, including two types of isomers, were
Zhi-Jun Wu, Guolin Zhang, Guo-Bo Xu, Guo-Bo Xu, Dong-Mei Fang, Guo-You Li, Li-Mei Li   +6 more
openaire   +3 more sources

Surfactants Usable for Electrospray Ionization Mass Spectrometry

Analytical Biochemistry, 2000
Surfactants suppress the electrospray ionization (ESI) of various compounds. Here we demonstrate that fluorinated surfactants such as perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOSA) could be employed for ESI-MS without a significant decrease in sensitivity.
Hiroyuki Katayama, Yasushi Ishihama, Naoki Asakawa   +2 more
openaire   +3 more sources

Electrochemical processes in electrospray ionization mass spectrometry

Journal of Mass Spectrometry, 2000
Editorial Comment Last month we presented, as a Special Feature, a set of five articles that constituted a Commentary on the fundamentals and mechanism of electrospray ionization (ESI). These articles produced some lively discussion among the authors on the role of electrochemistry in ESI.
Christie G. Enke, Manuel Martinez-Sanchez, Gary J. Van Berkel, Juan Fernandez de la Mora, John B. Fenn, Richard B. Cole   +5 more
openaire   +3 more sources

Electrospray ionization mass spectrometry fingerprinting of beer

The Analyst, 2005
After just simple degassing, dilution, pH adjustment and direct flow injection, characteristic fingerprint spectra of beer samples have been obtained by fast (few seconds) electrospray ionization mass spectrometry (ESI-MS) analysis in both the negative and positive ion modes.
Alexssander Shigueru Araujo, Marcos N. Eberlin, Lilian Lúcia da Rocha, Reinaldo Almeida, Alexandra Christine Helena Frankland Sawaya, Rodrigo Ramos Catharino, Daniela M. Tomazela   +6 more
openaire   +3 more sources

Electrospray ionization mass spectrometry fingerprinting of propolis

The Analyst, 2004
Crude ethanolic extracts of propolis, a natural resin, have been directly analysed using electrospray ionization mass (ESI-MS) and tandem mass spectrometry (ESI-MS/MS) in the negative ion mode. European, North American and African samples have been analyzed, but emphasis has been given to Brazilian propolis which displays diverse and region-dependent ...
Vassya Bankova, Angela Ramalho Custódio, Marcos N. Eberlin, Daniela M. Tomazela, Ildenize B. S. Cunha, Alexandra Christine Helena Frankland Sawaya, Maria Cristina Marcucci   +6 more
openaire   +3 more sources

Imaging of Proteins in Tissue Samples Using Nanospray Desorption Electrospray Ionization Mass Spectrometry.

Analytical Chemistry, 2015
Chemical maps of tissue samples provide important information on biological processes therein. Recently, advances in tissue imaging have been achieved using ambient ionization techniques, such as desorption electrospray ionization mass spectrometry (DESI-
Cheng-Chih Hsu, P. Chou, R. Zare
semanticscholar   +1 more source

Dinuclear copper intermediates in copper(I)-catalyzed azide-alkyne cycloaddition directly observed by electrospray ionization mass spectrometry.

Angewandte Chemie, 2015
The mechanism of the CuAAC reaction has been investigated by electrospray ionization mass spectrometry (ESI-MS) using a combination of the neutral reactant approach and the ion-tagging strategy.
C. Iacobucci, S. Reale, J. Gal, F. De Angelis   +3 more
semanticscholar   +1 more source

ChemInform Abstract: Electrospray Ionization for Mass Spectrometry of Large Biomolecules

ChemInform, 1989
Electrospray ionization has recently emerged as a powerful technique for producing intact ions in vacuo from large and complex species in solution. To an extent greater than has previously been possible with the more familiar "soft" ionization methods, this technique makes the power and elegance of mass spectrometric analysis applicable to the large ...
Craig M. Whitehouse, John B. Fenn, Shek Fu Wong, Chin Kai Meng, Matthias Mann   +4 more
openaire   +4 more sources

Determination of micelle mass by electrospray ionization mass spectrometry

Journal of Mass Spectrometry, 2005
AbstractBy electrospray ionization (ESI) mass spectrometry, micelle solutions of sodium cholate were investigated in detail in the presence and absence of ethanol. The average aggregation number could be evaluated from the spectra acquired under conditions where soft collisions adequate to measure the micelle solution were induced, and the value agreed
Koji Takeda, Daisuke Nohara, Takatomo Kajiura   +2 more
openaire   +3 more sources

Lipidomics: analysis of the lipid composition of cells and subcellular organelles by electrospray ionization mass spectrometry.

Annual Review of Biochemistry, 2014
Lipidomics aims to quantitatively define lipid classes, including their molecular species, in biological systems. Lipidomics has experienced rapid progress, mainly because of continuous technical advances in instrumentation that are now enabling ...
B. Brügger
semanticscholar   +1 more source