Author(s): Gomes, Anderson Herbert de Abreu, 1985- ; Brito, Arnaldo Naves de, 1962-
Date: 2017
Persistent ID: https://hdl.handle.net/20.500.12733/1665436
Origin: Oasisbr
Subject(s): Aminoácidos; Ciência atmosférica; Espectroscopia fotoeletrônica de raio X; Aminoacids; Atmospheric science; X-ray photoelectron spectroscopy; Artigo original
Agradecimentos: Financial support from the STINT-CAPES Proc. 99999.009805/2014-01, Swedish Research Council (VR), Swedish Foundation for Strategic Research, and the Carl Tryggers foundation is gratefully acknowledged. MAX-lab, Lund University, Sweden, is acknowledged for the allocation of beamtime and laboratory facilities. We would like to acknowledge the Brazilians funding agencies CNPq-Brazil Projs. 480967-2013, 304142/2015-8 and CAPES-Brazil Proj. A66-2013
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
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
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