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Surface Propensity of Atmospherically Relevant Amino Acids Studied by XPS
Brasilia Univ UnB, Inst Phys, Box 4455, BR-70910970 Brasilia, DF, Brazil..
Univ Estadual Campinas, UNICAMP, Dept Appl Phys, Inst Phys Gleb Wataghin, BR-13083859 Campinas, SP, Brazil..
Brasilia Univ UnB, Inst Phys, Box 4455, BR-70910970 Brasilia, DF, Brazil..
Univ Estadual Campinas, UNICAMP, Dept Appl Phys, Inst Phys Gleb Wataghin, BR-13083859 Campinas, SP, Brazil..
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2017 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 121, no 16, 4220-4225 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2017. Vol. 121, no 16, 4220-4225 p.
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-323456DOI: 10.1021/acsjpcb.7b02174ISI: 000400534200031PubMedID: 28358197OAI: oai:DiVA.org:uu-323456DiVA: diva2:1120445
Funder
Swedish Research CouncilCarl Tryggers foundation Swedish Foundation for Strategic Research
Available from: 2017-07-06 Created: 2017-07-06 Last updated: 2017-07-06Bibliographically approved

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Björneholm, Olle

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