Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/344907
Type: Artigo
Title: Surface propensity of atmospherically relevant amino acids studied by XPS
Author: Mocellin, A.
Gomes, A. H. de A.
Araujo, O. C.
Brito, A. N. de
Björneholm, O.
Abstract: Amino acids constitute an important fraction of the water-soluble organic nitrogen (WSON) compounds in aerosols and are involved in many processes in the atmosphere. In this-Work, we applied X-ray photoelectron spectroscopy (XPS) to study aqueous solutions of four amino acids, glycine, alanine, Valirie) and methionine, in their zwitterionic forms. We found that amino acids with hydrophilic side chains and smaller size, GLY and ALA, tend to stay in the bulk of the liquid, while the hydrophobic and bigger amino acids, VAL and MET, are found to concentrate more on the surface. We found experimental evidence that the amino acids have preferential orientation relative to the surface, with the hydrophobic side chain being closer to the surface than the hydrophilic carboxylate group. The observed amino acid surface propensity has implications in atmospheric science as the surface interactions play a central role in cloud droplet formation, and they should be considered in climate models.
Subject: Aminoácidos
Ciência atmosférica
Espectroscopia fotoeletrônica de raio X
Aminoacids
Atmospheric science
X-ray photoelectron spectroscopy
Country: Estados Unidos
Editor: American Chemical Society
Rights: fechado
Identifier DOI: 10.1021/acs.jpcb.7b02174
Address: https://pubs.acs.org/doi/10.1021/acs.jpcb.7b02174
Date Issue: 2017
Appears in Collections:IFGW - Artigos e Outros Documentos

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