Artigo de periodico

Does Positron Attachment Take Place in Water Solution? (2024)

• Authors:
  • Bergami, Mateus
  • Charry, Jorge
  • Reyes, Andres
  • Coutinho, Kaline Rabelo
  • Varella, Márcio Teixeira do Nascimento
• USP affiliated authors: COUTINHO, KALINE RABELO - IF ; VARELLA, MARCIO TEIXEIRA DO NASCIMENTO - IF ; ROCHA, MATEUS BERGAMI - IF
• Unidade: IF
• DOI: 10.1021/acs.jpcb.4c03627
• Subjects: MOLÉCULA; PEPTÍDEOS; PROTEÍNAS
• Keywords: CLUSTER CHEMISTRY; MOLECULES; MONOMERS; NUCLEAR RADIATION; PEPTIDES AND PROTEINS
• Agências de fomento:
  • Financiamento CAPES
  • Financiamento CNPq
  • Financiamento FAPESP
  • Financiamento FAPESP
• Language: Inglês
• Abstract: We performed a computational study of positron attachment to hydrated amino acids, namely glycine, alanine, and proline in the zwitterionic form. We combined the sequential quantum mechanics/molecular mechanics (s-QM/MM) method with various levels of any particle molecular orbital (APMO) calculations. Consistent with previous studies, our calculations indicate the formation of energetically stable states for the isolated and microsolvated amino acids, in which the positron localizes around the carboxylate group. However, for the larger clusters, composed of 7 to 40 water molecules, hydrogen bonding between the solute and solvent molecules disfavors positron attachment to the amino acids, giving rise to surface states in which the positron is located around the water–vacuum interface. The analysis of positron binding energies, positronic orbitals, radial probability distributions, and annihilation rates consistently pointed out the change from positron–solute to positron–solvent states. Even with the inclusion of an electrostatic embedding around the aggregates, the positrons did not localize around the solute. Positron attachment to molecules in the gas phase is a well-established fact. The existence of hydrated positronic molecules could also be expected from the analogy with transient anion states, which are believed to participate in radiation damage. Our results indicate that positron attachment to hydrated biomolecules, even to zwitterions with negatively charged carboxylated groups, would not take place. For the larger clusters, in which positron–water interactions are favored, the calculations indicate an unexpectedly large contribution of the core orbitals to the annihilation rates, between 15 and 20%.Finally, we explored correlations between positron binding energies (PBEs) and dipole moments, as well as annihilation rates and PBEs, consistent with previous studies for smaller clusters.
• Imprenta:
  • Publisher: American Chemical Society
  • Publisher place: Washington, DC
  • Date published: 2024
• Source:
  • Título: Journal of Physical Chemistry B
  • Volume/Número/Paginação/Ano: Vol 128/Issue 41 Pages 10178 - 10188, 2024

Informações sobre o DOI: 10.1021/acs.jpcb.4c03627 (Fonte: oaDOI API)
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• ABNT

  BERGAMI, Mateus et al. Does Positron Attachment Take Place in Water Solution?. Journal of Physical Chemistry B, 2024Tradução . . Disponível em: https://doi.org/10.1021/acs.jpcb.4c03627. Acesso em: 24 fev. 2026.

• APA

  Bergami, M., Charry, J., Reyes, A., Coutinho, K. R., & Varella, M. T. do N. (2024). Does Positron Attachment Take Place in Water Solution? Journal of Physical Chemistry B. doi:10.1021/acs.jpcb.4c03627

• NLM

  Bergami M, Charry J, Reyes A, Coutinho KR, Varella MT do N. Does Positron Attachment Take Place in Water Solution? [Internet]. Journal of Physical Chemistry B. 2024 ;[citado 2026 fev. 24 ] Available from: https://doi.org/10.1021/acs.jpcb.4c03627

• Vancouver

  Bergami M, Charry J, Reyes A, Coutinho KR, Varella MT do N. Does Positron Attachment Take Place in Water Solution? [Internet]. Journal of Physical Chemistry B. 2024 ;[citado 2026 fev. 24 ] Available from: https://doi.org/10.1021/acs.jpcb.4c03627

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