Collision-Induced Dissociation of Halide Ion–Arginine Complexes: Evidence for Anion-Induced Zwitterion Formation in Gas-Phase Arginine

2012 ◽  
Vol 116 (2) ◽  
pp. 801-809 ◽  
Author(s):  
Edward M. Milner ◽  
Michael G. D. Nix ◽  
Caroline E. H. Dessent
Keyword(s):  
Gas Phase ◽  
Collision Induced Dissociation ◽  
Zwitterion Formation

Rapid Evaluation of Suitable Substrates with High Affinity to Artificial Caffeine Receptors by MS Based Techniques

2005 ◽  
Vol 60 (10) ◽  
pp. 1077-1082 ◽  
Author(s):  
Daniela Mirk ◽  
Heinrich Luftmann ◽  
Siegfried R. Waldvogel
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Collision Induced Dissociation ◽  
Rapid Evaluation ◽  
Tandem Mass ◽  
Binding Affinities ◽  
Electrospray Tandem Mass Spectrometry ◽  
Relative Stabilities ◽  
Receptor Complexes ◽  
High Affinity

A modification of our triphenylene ketal based receptor facilitates electrospray tandem mass spectrometry investigations. Binding affinities of eleven potential substrates, e.g. caffeine and other xanthine alkaloids, are probed in the gas phase with collision induced dissociation. The relative stabilities of the substrate-receptor complexes are rapidly determined and the findings are correlated with the corresponding results in solution.

Chemical Properties of Zwitterionic Imidazolium Alkanecarboxylates Studied in Gas-Phase by Electrospray Ionization – Collision-Induced Dissociation / Cviterjonu Tipa Imidazolija Alkānkarboksilātu Ķīmiskās Īpašības Gāzes Fāzē, Kas Pētītas Ar Elektroizsmidzināšanas Jonizāciju – Sadursmju Inducēto Disociāciju

2012 ◽  
Vol 51 (3) ◽  
pp. 249-256
Author(s):  
A. Podjava ◽  
P. Mekss ◽  
A. Zicmanis ◽  
S. Krasnov
Keyword(s):  
Gas Phase ◽  
Chemical Properties ◽  
Collision Induced Dissociation ◽  
Potassium Ions ◽  
Hydrogen Deuterium Exchange ◽  
Carboxylate Group ◽  
Hydrogen Deuterium ◽  
Ionization Mode ◽  
Sodium And Potassium ◽  
Phase Chemical

Gas-phase chemical properties of several (1-methylimidazol-3-io)-alkane-1-carboxylates (alkane=ethane, propane and butane) have been investigated in this study. These substances are synthesized using classical transformations and analyzed in positive ionization mode using collision-induced dissociation (0-50 eV). These experiments were carried out in both deuterated and undeuterated solvent media. The data obtained in this study show, that carboxylate group weakly influences fragmentation of zwitterionic imidazolium carboxylates in positive electrospray mode. On the other hand, these compounds exert a tendency to form various adducts with sodium and potassium ions and to participate in hydrogen/deuterium exchange in the gas phase.

Collision-Induced Dissociation of Highly Excited NO2in the Gas Phase and on MgO (100) Surfaces

1997 ◽  
pp. 291-303
Author(s):  
A. Sanov ◽  
D. W. Arnold ◽  
M. Korolik ◽  
H. Ferkel ◽  
C. R. Bieler ◽  
...  
Keyword(s):  
Gas Phase ◽  
Collision Induced Dissociation

scholarly journals Photoproducts of the Photodynamic Therapy Agent Verteporfin Identified via Laser Interfaced Mass Spectrometry

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5280
Author(s):  
Chris Furlan ◽  
Jacob A. Berenbeim ◽  
Caroline E. H. Dessent
Keyword(s):  
Mass Spectrometry ◽  
Photodynamic Therapy ◽  
Macular Degeneration ◽  
Gas Phase ◽  
Mass Spectrometer ◽  
Red Light ◽  
Solution Phase ◽  
Collision Induced Dissociation ◽  
Free Base ◽  
New Information

Verteporfin, a free base benzoporphyrin derivative monoacid ring A, is a photosensitizing drug for photodynamic therapy (PDT) used in the treatment of the wet form of macular degeneration and activated by red light of 689 nm. Here, we present the first direct study of its photofragmentation channels in the gas phase, conducted using a laser interfaced mass spectrometer across a broad photoexcitation range from 250 to 790 nm. The photofragmentation channels are compared with the collision-induced dissociation (CID) products revealing similar dissociation pathways characterized by the loss of the carboxyl and ester groups. Complementary solution-phase photolysis experiments indicate that photobleaching occurs in verteporfin in acetonitrile; a notable conclusion, as photoinduced activity in Verteporfin was not thought to occur in homogenous solvent conditions. These results provide unique new information on the thermal break-down products and photoproducts of this light-triggered drug.

scholarly journals Investigation of activation energies for dissociation of host-guest complexes in the gas phase using low-energy collision induced dissociation

2019 ◽  
Vol 54 (5) ◽  
pp. 437-448 ◽  
Author(s):  
Parisa Bayat ◽  
David Gatineau ◽  
Denis Lesage ◽  
Sina Marhabaie ◽  
Alexandre Martinez ◽  
...  
Keyword(s):  
Gas Phase ◽  
Activation Energies ◽  
Low Energy ◽  
Collision Induced Dissociation ◽  
Energy Collision

scholarly journals Formation and reactions of the 1, 8-naphthyridine (napy) ligated geminally dimetallated phenyl complexes [(napy)Cu2(Ph)]+, [(napy)Ag2(Ph)]+ and [(napy)CuAg(Ph)]+

2019 ◽  
Vol 25 (1) ◽  
pp. 30-43 ◽  
Author(s):  
Qiuyan Jin ◽  
Jiaye Li ◽  
Alireza Ariafard ◽  
Allan J Canty ◽  
Richard AJ O’Hair
Keyword(s):  
Density Functional Theory ◽  
Gas Phase ◽  
Density Functional ◽  
Ion Trap ◽  
Density Functional Theory Calculations ◽  
Collision Induced Dissociation ◽  
Ion Trap Mass Spectrometry ◽  
Functional Theory ◽  
Organometallic Cations ◽  
Gas Phase Ion

Gas-phase ion trap mass spectrometry experiments and density functional theory calculations have been used to examine the routes to the formation of the 1,8-naphthyridine (napy) ligated geminally dimetallated phenyl complexes [(napy)Cu2(Ph)]+, [(napy)Ag2(Ph)]+ and [(napy)CuAg(Ph)]+ via extrusion of CO2 or SO2 under collision-induced dissociation conditions from their corresponding precursor complexes [(napy)Cu2(O2CPh)]+, [(napy)Ag2(O2CPh)]+, [(napy)CuAg(O2CPh)]+ and [(napy)Cu2(O2SPh)]+, [(napy)Ag2(O2SPh)]+, [(napy)CuAg(O2SPh)]+. Desulfination was found to be more facile than decarboxylation. Density functional theory calculations reveal that extrusion proceeds via two transition states: TS1 enables isomerization of the O, O-bridged benzoate to its O-bound form; TS2 involves extrusion of CO2 or SO2 with the concomitant formation of the organometallic cation and has the highest barrier. Of all the organometallic cations, only [(napy)Cu2(Ph)]+ reacts with water via hydrolysis to give [(napy)Cu2(OH)]+, consistent with density functional theory calculations which show that hydrolysis proceeds via the initial formation of the adduct [(napy)Cu2(Ph)(H2O)]+ which then proceeds via TS3 in which the coordinated H2O is deprotonated by the coordinated phenyl anion to give the product complex [(napy)Cu2(OH)(C6H6)]+, which then loses benzene.

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