Results 301 to 310 of about 204,339 (353)

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
openaire   +2 more sources

Electrode‐assisted desorption electrospray ionization mass spectrometry

Journal of Mass Spectrometry, 2010
AbstractA new ion source has been developed for rapid, noncontact analysis of materials at ambient conditions. The method provides desorption of analytes under ambient conditions directly from different surfaces with little or no sample preparation. The new method, termed electrode‐assisted desorption electrospray ionization (EADESI), is on the basis ...
Özdemir A, Chen CH.
openaire   +3 more sources

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
openaire   +1 more source

Synchronized Desorption Electrospray Ionization Mass Spectrometry Imaging

Analytical Chemistry, 2015
Desorption electrospray ionization (DESI) has emerged as a powerful technique for mass spectral analysis and imaging under ambient conditions. Synchronization of DESI (sDESI) with the ion injection period (IT)of low-duty cycle mass spectrometers has been previously shown to improve sensitivity and reduce the amount of sample depleted during the ...
Comi, Troy J., Woo Ryu, Seung, Perry, Richard H.   +2 more
openaire   +3 more sources

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
openaire   +2 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.
Y, Ishihama, H, Katayama, N, Asakawa
openaire   +2 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 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
openaire   +2 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 ...
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
openaire   +2 more sources

Conformational effects in protein electrospray‐ionization mass spectrometry

Mass Spectrometry Reviews, 2015
Electrospray‐ionization mass spectrometry (ESI‐MS) is a key tool of structural biology, complementing the information delivered by conventional biochemical and biophysical methods. Yet, the mechanism behind the conformational effects in protein ESI‐MS is an object of debate.
Li, J, SANTAMBROGIO, CARLO, BROCCA, STEFANIA, Rossetti, G, Carloni, P, GRANDORI, RITA   +5 more
openaire   +3 more sources

Electrospray Ionization High-Resolution Ion Mobility Spectrometry−Mass Spectrometry

Analytical Chemistry, 1998
A hybrid atmospheric pressure ion mobility spectrometer is described which exhibits resolving power approaching the diffusion limit for singly and multiply charged ions (over 200 for the most favorable case). Using an electrospray ionization source and a downstream quadrupole mass spectrometer with electron multiplier as detector, this ESI-IMS-MS ...
C, Wu, W F, Siems, G R, Asbury, H H, Hill   +3 more
openaire   +2 more sources