Zobrazeno 1 - 10
of 31
pro vyhledávání: '"Sandra Osburn"'
Autor:
Parker Crowther, Daniel E. Austin, Anupriya, Sandra Osburn-Staker, Eric T. Sevy, Logan R. Sweet, Brandon Turner, Abraham De la Cruz
Publikováno v:
Planetary and Space Science. 172:1-7
Closed-source mass spectrometers rely on thermalization of neutral molecules, which are intercepted at a high velocity relative to the spacecraft. However, encountered molecules generally impact with enough kinetic energy to drive chemical modificati
Publikováno v:
Journal of the American Society for Mass Spectrometry. 28:1425-1431
A suite of isotopologues of methyl D-glucopyranosides is used in conjunction with multistage mass spectrometry experiments to determine the radical site and cleavage reactions of sugar radical cations formed via a recently developed 'bio-inspired' me
Publikováno v:
Rapid Communications in Mass Spectrometry. 30:69-80
Rationale Experiments were performed to probe the creation of apparent even-electron, [M–H]+ ions by CID of Ag-cationized peptides with N-terminal imine groups (Schiff bases). Methods Imine-modified peptides were prepared using condensation reactio
Autor:
Andrii Piatkivskyi, Victor Ryzhov, John T. Lawler, Sandra Osburn, Michael Lesslie, Travis R. Helgren, Richard A. J. O'Hair
Publikováno v:
International Journal of Mass Spectrometry. 390:124-131
The effects of hydrogen bonding and spin density at the oxygen atom on the gas-phase reactivity of phenoxyl radicals were investigated experimentally and theoretically in model systems and the dipeptide LysTyr. Gas-phase ion-molecule reactions were c
Publikováno v:
European Journal of Mass Spectrometry. 21:589-597
Radical migration, both intramolecular and intermolecular, from the tyrosine phenoxyl radical Tyr(O•) to the cysteine radical Cys(S•) in model peptide systems was observed in the gas phase. Ion–molecule reactions (IMRs) between the radical cati
Publikováno v:
International Journal of Mass Spectrometry. 378:95-106
A ‘bio-inspired’ method has been developed for generating sugar radical cations by multistage mass spectrometry (MS 4 ) experiments involving collision-induced dissociation (CID) of protonated non-covalent complexes between a sugar and an S -nitr
Publikováno v:
International Journal of Mass Spectrometry. 378:312-321
Gas-phase reactivity of several sulfur-based radical cations with various volatile neutrals was studied in a modified quadrupole ion trap mass spectrometer. The radical cations were formed by two methods. The first method (introduced by Siu and co-wo
Publikováno v:
The journal of physical chemistry. A. 120(41)
Experimental and computational quantum chemistry investigations of the gas-phase ion–molecule reactions between the distonic ions +H3N(CH2)nS• (n = 2–4) and the reagents dimethyl disulfide, allyl bromide, and allyl iodide demonstrate that intra
Autor:
Sandra Osburn, Richard A. J. O'Hair
Publikováno v:
Rapid Communications in Mass Spectrometry. 27:2783-2788
RATIONALE Introducing radicals onto gas-phase non-covalent complexes and studying their chemistry is a relatively unexplored frontier. In generating these radicals via bond homolysis reactions, it is important that the energy necessary for forming th
Publikováno v:
The Journal of Physical Chemistry. A, 117(6), 1144-1150. American Chemical Society
The Journal of Physical Chemistry A, 117, 6, pp. 1144-1150
Journal of Physical Chemistry A, 117, 1144-1150
The Journal of Physical Chemistry A, 117, 1144-1150
The Journal of Physical Chemistry A, 117, 6, pp. 1144-1150
Journal of Physical Chemistry A, 117, 1144-1150
The Journal of Physical Chemistry A, 117, 1144-1150
The reactivity of the cysteine (Cys) and homocysteine (Hcy) radical cation was studied using ion molecule reactions. The radical cations were generated via collision-induced dissociation (CID) of their S-nitrosylated precursors. Cleavage of the S-NO