| Texto completo | |
| Autor(es): |
da Silva, Filipe Ferreira
[1]
;
Varella, Marcio T. do N.
[2]
;
Jones, Nykola C.
[3]
;
Hoffmann, Soren Vronning
[3]
;
Denifl, Stephan
[4, 5]
;
Bald, Ilko
[6, 7]
;
Kopyra, Janina
[8]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ NOVA Lisboa, Lab Colisoes Atom & Mol, Dept Fis, Fac Ciencias & Tecnol, CEFITEC, P-2829516 Caparica - Portugal
[2] Univ Sao Paulo, Inst Fis, Rua Matao 1371, BR-05508090 Sao Paulo - Brazil
[3] Aarhus Univ, Dept Phys & Astron, ISA, Ny Munkegade 120, DK-8000 Aarhus - Denmark
[4] Leopold Franzens Univ Innsbruck, Inst Ionenphys & Angew Phys, Tech Str 25, A-6020 Innsbruck - Austria
[5] Leopold Franzens Univ Innsbruck, Ctr Mol Biosci CMBI, Tech Str 25, A-6020 Innsbruck - Austria
[6] Univ Potsdam, Dept Chem Phys Chem, Karl Liebknecht Str 24-25, D-14476 Potsdam - Germany
[7] BAM Fed Inst Mat Res & Testing, Dept Analyt Chem & Reference Mat 1, Richard Willstatter Str 11, D-12489 Berlin - Germany
[8] Siedlce Univ, Fac Sci, 3 Maja 54, PL-08110 Siedlce - Poland
Número total de Afiliações: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CHEMISTRY-A EUROPEAN JOURNAL; v. 25, n. 21, p. 5498-5506, APR 11 2019. |
| Citações Web of Science: | 1 |
| Resumo | |
3-Bromopyruvic acid (3BP) is a potential anticancer drug, the action of which on cellular metabolism is not yet entirely clear. The presence of a bromine atom suggests that it is also reactive towards low-energy electrons, which are produced in large quantities during tumour radiation therapy. Detailed knowledge of the interaction of 3BP with secondary electrons is a prerequisite to gain a complete picture of the effects of 3BP in different forms of cancer therapy. Herein, dissociative electron attachment (DEA) to 3BP in the gas phase has been studied both experimentally by using a crossed-beam setup and theoretically through scattering and quantum chemical calculations. These results are complemented by a vacuum ultraviolet absorption spectrum. The main fragmentation channel is the formation of Br- close to 0 eV and within several resonant features at 1.9 and 3-8 eV. At low electron energies, Br- formation proceeds through sigma{*} and pi{*} shape resonances, and at higher energies through core-excited resonances. It is found that the electron-capture cross-section is clearly increased compared with that of non-brominated pyruvic acid, but, at the same time, fragmentation reactions through DEA are significantly altered as well. The 3BP transient negative ion is subject to a lower number of fragmentation reactions than those of pyruvic acid, which indicates that 3BP could indeed act by modifying the electron-transport chains within oxidative phosphorylation. It could also act as a radio-sensitiser. (AU) | |
| Processo FAPESP: | 17/24145-9 - Transientes moleculares aniônicos e positrônicos |
| Beneficiário: | Andre de Pinho Vieira |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |