Results 301 to 310 of about 201,447 (356)

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
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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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Arc-Induced Electrospray Ionization Mass Spectrometry

Analytical Chemistry, 2023
Arc-induced electrospray ionization mass spectrometry (AESI-MS) was developed during which alternating current electrospray is simply achieved through the arc plasma. The AESI source exploits the arc's temperature and charge properties to generate aerosols consisting of charged microdroplets.
Kaineng Huang, Hui Zeng, Xingyue Li, Xiaoting Li, Yuanjiang Pan, Yuanji Gao   +5 more
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Electrospray ionization mass spectrometry of metalloporphyrins

Journal of Mass Spectrometry, 1998
The magnesium, nickel, copper, zinc and vanadium metalloporphyrins from octaethylporphyrin, etioporphyrin I and tetraphenylporphyrin were characterized using electrospray ionization mass spectrometry (ESI-MS). The ion abundance of each of the porphyrins present in binary mixtures was monitored as a function of the porphyrin concentration and is ...
V E, Vandell, P A, Limbach
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Electrospray Ionization for Mass Spectrometry of Large Biomolecules

Science, 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 ...
J B, Fenn, M, Mann, C K, Meng, S F, Wong, C M, Whitehouse   +4 more
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Electrospray ionization tandem mass spectrometry of chaetoglobosins

Rapid Communications in Mass Spectrometry, 2012
RATIONALE Chaetoglobosins are a family of macrocyclic polyketide alkaloids. They possess many similar isomers and exhibit a wide range of biological activities.
Guo-Bo, Xu, Li-Mei, Li, Dong-Mei, Fang, Guo-You, Li, Guo-Lin, Zhang, Zhi-Jun, Wu   +5 more
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Electrospray ionization mass spectrometry

2001
Abstract Characterization of protein-ligand interactions involves the determination of stoichiometry, affinity, and conformational changes associated with such interactions. Mass spectrometry is rapidly emerging as an important and powerful new tool in this area to complement the wealth of other techniques described in these volumes. The
T J Hill, P J Derrick
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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.
Y, Ishihama, H, Katayama, N, Asakawa
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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 S, Araújo, Lilian L, da Rocha, Daniela M, Tomazela, Alexandra C H F, Sawaya, Reinaldo R, Almeida, Rodrigo R, Catharino, Marcos N, Eberlin   +6 more
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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 ...
Alexandra C H F, Sawaya, Daniela M, Tomazela, Ildenize B S, Cunha, Vassya S, Bankova, Maria C, Marcucci, Angela R, Custodio, Marcos N, Eberlin   +6 more
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