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Free amino acids in aerosol samples collected over the central Arctic Ocean in summer 
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM).
Stockholm University, Faculty of Science, Department of Meteorology .
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Size-resolved airborne particle samples collected over the central Arctic Ocean in summer, during the Arctic Ocean expedition (AOE)-2001, have with regard to dissolved free amino acids (DFAAs) been analysed. Serine, alanine, aspartic acid followed by glutamatic acid was the dominating amino acids in the DFAA fraction. The high concentrations of serine found in all blanks must be taken into consider discussing its contribution. The total concentration of DFAAs in the bulk aerosols, with serine excluded ranged from 13-89 pmol/m3, which agree well with previous less size-resolved data reported for remote areas. The DFAA fraction was shown to explain <0.7% of the total particle mass collected on the substrate. The size distribution of the DFAAs showed enrichment towards the submicron mode with a factor of 2-3 compare to the coarse mode. As the DFAAs were found in sizes corresponding to either film or jet drops, or to both, the surface micro layer was suggested to be their source. A comparison of the reported DFAA composition with amino acid data obtained for simultaneously collected micro layer samples, showed no clear relation. Ongoing oxidation of proteins and peptides on the sampling substrate combined with the considerable variation of the amino acid composition in the microlayer over time and sampling site may explain the obtained differences.

National Category
Meteorology and Atmospheric Sciences
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-29474OAI: oai:DiVA.org:su-29474DiVA: diva2:233465
Available from: 2009-09-01 Created: 2009-09-01 Last updated: 2010-01-14Bibliographically approved
In thesis
1. Development of GC-HRMS procedures for determination of naturally occuring polar compounds in various environmental applications 
Open this publication in new window or tab >>Development of GC-HRMS procedures for determination of naturally occuring polar compounds in various environmental applications 
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The overall objectives of this dissertation were to gain further understanding of the two following environmentally significant issues: (i) Determination of natural steroid hormones in blood plasma from perch (Perca fluviatilis) during a reproductive cycle and to evaluate the possibility of using the steroid composition as a biomarker for early signs of endocrine disruptive effects. (ii) Determination of dissolved free amino acids in size resolved airborne particles collected over the Arctic pack ice area (>80°N) in summer and to study their overall relationship with the ocean surface microlayer as a potential source.

 This was made possible by the development of two separate gas chromatographic–high resolution mass spectrometry methods. To enable separation with gas chromatography both steroids and amino acids had to be chemically modified to increase their volatility. The small sample volumes available and low concentrations of analytes required a multi-step clean-up procedure to enable determination.

 The results showed that the circulating levels of steroids in perch varied over the year and that the levels of some androgens were lower in female perch exposed to leachate from a refuse dump compare to unexposed perch, which may explain the decline in fertility observed for the former group. This also indicated that the steroid composition in the blood plasma may function as a sensitive biomarker.

 The levels of dissolved free amino acids were enriched in the submicrometer aerosol, peaking in sizes around 100nm aerodynamic diameter. These findings do support a previous assumption that the most likely source for these particles is the surface microlayer of the open water between the ice floes. The most likely exchange mechanism of biogenic matter between ocean and atmosphere is the bursting of bubbles at the surface of the leads. This mechanism would provide a very important and poorly understood link between cloud radiative properties and marine biochemistry in the summer high Arctic (>80°N) through the production of cloud condensation nuclei.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2009. 57 p.
Keyword
GC-HRMS, steroid hormones, amino acids, perch, size-resolved aerosol, Arctic
National Category
Natural Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-29283 (URN)978-91-7155-907-4 (ISBN)
Public defence
2009-09-25, De Geer salen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 1: Accepted. Paper 4: In progress. Paper 5: In progress.Available from: 2009-09-03 Created: 2009-08-20 Last updated: 2009-09-01Bibliographically approved

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