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Mocellin A, Gomes AHA, Araújo OC, et al. Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS. J Phys Chem B. 2017;121(16):4220-4225doi: 10.1021/acs.jpcb.7b02174.
Mocellin, A., Gomes, A. H. A., Araújo, O. C., de Brito, A. N., & Björneholm, O. (2017). Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS. The journal of physical chemistry. B, 121(16), 4220-4225. https://doi.org/10.1021/acs.jpcb.7b02174
Mocellin, Alexandra, et al. "Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS." The journal of physical chemistry. B vol. 121,16 (2017): 4220-4225. doi: https://doi.org/10.1021/acs.jpcb.7b02174
Mocellin A, Gomes AHA, Araújo OC, de Brito AN, Björneholm O. Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS. J Phys Chem B. 2017 Apr 27;121(16):4220-4225. doi: 10.1021/acs.jpcb.7b02174. Epub 2017 Apr 12. PMID: 28358197.
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J Phys Chem B. 2017 Apr 27;121(16):4220-4225. doi: 10.1021/acs.jpcb.7b02174. Epub 2017 Apr 12.

Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS.

The journal of physical chemistry. B

Alexandra Mocellin, Anderson Herbert de Abreu Gomes, Oscar Cardoso Araújo, Arnaldo Naves de Brito, Olle Björneholm

Affiliations

  1. Institute of Physics, Brasilia University (UnB) , Box 4455, Brasília 70910-970, Brazil.
  2. Institute of Physics "Gleb Wataghin", Department of Applied Physics, University of Campinas (Unicamp) , Campinas 13083-859, Brazil.
  3. Department of Physics and Astronomy, Uppsala University , 752 36 Uppsala, Sweden.

PMID: 28358197 DOI: 10.1021/acs.jpcb.7b02174

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, valine, 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.

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