Trapping of Paraffin and Other Compounds by Asphaltenes Detected by Laser Desorption Ionization−Time of Flight Mass Spectrometry (LDI−TOF MS): Role of A1 and A2 Asphaltene Fractions in This Trapping

2009 ◽  
Vol 23 (2) ◽  
pp. 842-848 ◽  
Author(s):  
Sócrates Acevedo ◽  
Josmelith M. Cordero T. ◽  
Herve Carrier ◽  
Brice Bouyssiere ◽  
Ryszard Lobinski
Keyword(s):  
Mass Spectrometry ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Desorption Ionization ◽  
Flight Mass Spectrometry ◽  
Tof Ms

The influence of oxidative debris on the fragmentation and laser desorption/ionization process of graphene oxide derivatives

2018 ◽  
Vol 42 (15) ◽  
pp. 12692-12697 ◽  
Author(s):  
Yu Lim Hong ◽  
Jieon Lee ◽  
Bon-Cheol Ku ◽  
Kyungtae Kang ◽  
Seunghyun Lee ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Graphene Oxide ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Ionization Process ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Desorption Ionization ◽  
Flight Mass Spectrometry ◽  
Tof Ms

The influence of oxidative debris on laser desorption/ionization time of flight mass spectrometry (LDI-TOF-MS) analysis by using graphene oxide as a matrix was investigated to reveal its role in LDI process.

scholarly journals Iodine-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Sai Raghuveer Chava
Keyword(s):  
Mass Spectrometry ◽  
Time Of Flight ◽  
Laser Desorption ◽  
Laser Desorption Ionization ◽  
Ionization Time ◽  
Maldi Tof Ms ◽  
Desorption Ionization ◽  
Maldi Tof ◽  
Flight Mass Spectrometry ◽  
Tof Ms

Adsorption and desorption of iodine-containing α-cyano-4-hydroxycinnamic acid (aCCa) matrix species were studied using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The MALDI-TOF MS method showed that ca. 0.8- 1.4 monolayer (~ 100 ppm) of iodine-containing species was adsorbed at the surface and assisted in desorption and ionization of a protein digest peptides or peptides varying in isoelectric potential. At low laser power, desorption of analytes in protonated and sodiated form was observed but not iodine cluster relative to aCCa without iodine, suggesting a two-electron reduction process to form the protonated pseudo molecular ion, although adsorption on the surface would lead to oxidation of iodide to iodine. The addition of iodine to matrix has been demonstrated to greatly facilitate the MALDI-TOF MS process and is a valuable tool when complex protein mixtures need to be analyzed.

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