Characterization of iron-sulfur cubane clusters by fast atom bombardment mass spectrometry: the formation of ionic [FemSn] clusters through gas-phase unimolecular reduction processes and their solution parallels

1992 ◽  
Vol 114 (18) ◽  
pp. 7132-7141 ◽  
Author(s):  
Wen Lian Lee ◽  
Douglas A. Gage ◽  
Zhi Heng Huang ◽  
Chi K. Chang ◽  
Mercouri G. Kanatzidis ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Fast Atom Bombardment ◽  
Reduction Processes ◽  
Iron Sulfur ◽  
Cubane Clusters

Gas-Phase Reactivity of Glycosides and Methyl Glycosides with Cu+, Ag+ and Pb2+ Ions by Fast-Atom Bombardment and Tandem Mass Spectrometry

2001 ◽  
Vol 7 (4-5) ◽  
pp. 321-330 ◽  
Author(s):  
Jean-Yves Salpin ◽  
Laurence Boutreau ◽  
Violette Haldys ◽  
Jeanine Tortajada
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Gas Phase ◽  
Fast Atom Bombardment ◽  
The Other ◽  
Tandem Mass ◽  
Pyranose Ring ◽  
Analytical Potential ◽  
Anomeric Center

The analytical potential of the complexation of three isomeric monosaccharides (D-glucose, D-galactose, D-fructose)and two methyl glycosides ( O-methyl-α-D-glucose and O-methyl-β-D-glucose)by three metal ions, Ag+, Cu+ and Pb2+, has been investigated by fast-atom bombardment (FAB)ionization and tandem mass spectrometry. Our results have shown that the unimolecular reactivity of Ag+ complexes allows the characterization of the C(4)stereochemistry of the pyranose ring, whereas a distinction between D-glucose and D-fructose is not achieved. On the other hand, each of the three [Cu + monosaccharide]+ complexes exhibits specific dissociation patterns. We have also observed that Pb2+ ions induce the richest reactivity and are of particular interest for the identification of the three isomers. Finally, this study has demonstrated that the stereochemistry of the anomeric center of O-methyl-D-glucose is easily determined by reaction with Ag+ or Pb2+ ions. Several mechanisms are proposed to account for the main fragmentations of cationized glucose.

scholarly journals State-of-the-Art Native Mass Spectrometry and Ion Mobility Methods to Monitor Homogeneous Site-Specific Antibody-Drug Conjugates Synthesis

2021 ◽  
Vol 14 (6) ◽  
pp. 498
Author(s):  
Evolène Deslignière ◽  
Anthony Ehkirch ◽  
Bastiaan L. Duivelshof ◽  
Hanna Toftevall ◽  
Jonathan Sjögren ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Ion Mobility ◽  
State Of The Art ◽  
Native Mass Spectrometry ◽  
Site Specific ◽  
Drug Conjugates ◽  
Conjugation Process ◽  
Antibody Drug

Antibody-drug conjugates (ADCs) are biotherapeutics consisting of a tumor-targeting monoclonal antibody (mAb) linked covalently to a cytotoxic drug. Early generation ADCs were predominantly obtained through non-selective conjugation methods based on lysine and cysteine residues, resulting in heterogeneous populations with varying drug-to-antibody ratios (DAR). Site-specific conjugation is one of the current challenges in ADC development, allowing for controlled conjugation and production of homogeneous ADCs. We report here the characterization of a site-specific DAR2 ADC generated with the GlyCLICK three-step process, which involves glycan-based enzymatic remodeling and click chemistry, using state-of-the-art native mass spectrometry (nMS) methods. The conjugation process was monitored with size exclusion chromatography coupled to nMS (SEC-nMS), which offered a straightforward identification and quantification of all reaction products, providing a direct snapshot of the ADC homogeneity. Benefits of SEC-nMS were further demonstrated for forced degradation studies, for which fragments generated upon thermal stress were clearly identified, with no deconjugation of the drug linker observed for the T-GlyGLICK-DM1 ADC. Lastly, innovative ion mobility-based collision-induced unfolding (CIU) approaches were used to assess the gas-phase behavior of compounds along the conjugation process, highlighting an increased resistance of the mAb against gas-phase unfolding upon drug conjugation. Altogether, these state-of-the-art nMS methods represent innovative approaches to investigate drug loading and distribution of last generation ADCs, their evolution during the bioconjugation process and their impact on gas-phase stabilities. We envision nMS and CIU methods to improve the conformational characterization of next generation-empowered mAb-derived products such as engineered nanobodies, bispecific ADCs or immunocytokines.

Characterization of α-amino acidato chromium(III) complexes by fast atom bombardment mass spectrometry

Polyhedron ◽  
1996 ◽  
Vol 15 (17) ◽  
pp. 2887-2894 ◽  
Author(s):  
Teresa M. Santos ◽  
Júlio D. Pedrosa de Jesus ◽  
Francisco M.L. Amado ◽  
Pedro M. Domingues ◽  
M. Graça Santana-Marques ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Fast Atom Bombardment
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