Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica

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Author(s) Botta, Oliver, Martins, Zita, Emmenegger, Christian, Dworkin, Jason P., Glavin, Daniel P., Harvey, Ralph P., Zenobi, Renato, Bada, Jeffrey L., Ehrenfreund, Pascale
Publication Type Journal Items, Publication Status: Published
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Title Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica
Author(s) Botta, Oliver
Martins, Zita
Emmenegger, Christian
Dworkin, Jason P.
Glavin, Daniel P.
Harvey, Ralph P.
Zenobi, Renato
Bada, Jeffrey L.
Ehrenfreund, Pascale
Journal or Series Title Meteoritics & planetary science
Volume Number 43
Issue Number 9
Start Page 1465
End Page 1480
ISSN 1086-9379
0026-1114
1945-5100
Publisher Wiley
Publication Place Tucson
Publication Date 2008
Abstract We have analyzed ice samples and meteorites from the LaPaz region of Antarctica to investigate the composition of polycyclic aromatic hydrocarbons (PAHs) and amino acids with the goal to understand whether or not there is a compositional relationship between the two reservoirs. Four LL5 ordinary chondrites (OCs) and one CK carbonaceous chondrite were collected as part of the 2003/2004 ANSMET season. Ice samples collected from directly underneath the meteorites were extracted. In addition, exhaust particles from the snowmobiles used during the expedition were collected to investigate possible contributions from this source. The meteorite samples, the particulate matter and solid-state extracts of the ice samples and the exhaust filters were subjected to two-step laser mass spectrometry (L2MS) to investigate the PAH composition. For amino acids analysis, the meteorites were extracted with water and acid hydrolyzed, and the extracts were analyzed with offline OPA/NAC derivatization combined with liquid chromatography with UV fluorescence detection and time of flight mass spectrometry (LC-FD/ToF-MS). PAHs in the particulate matter of the ice were found to be qualitatively similar to the meteorite samples, indicating that micron-sized grains of the meteorite may be embedded in the ice samples. The concentration levels of dissolved PAHs in all the ice samples were found to be below the detection limit of the L2MS. The PAH composition of the snowmobile exhaust is significantly different to the one in particulate matter, making it an unlikely source of contamination for Antarctic meteorites. The amino acids glycine, β-alanine and γ-amino-n-butyric acid that were detected at concentrations of 3 to 19 parts per billion (ppb) are probably indigenous to the Antarctic meteorites. Some of the LaPaz ice samples were also found to contain amino acids at concentration levels of 1 to 33 parts per trillion (ppt), in particular α-aminoisobutyric acid (AIB), an abundant non-protein amino acid of extraterrestrial origin found in some carbonaceous chondrites. We hypothesize that this amino acid could have been extracted from Antarctic micrometeorites and the particulate matter of the meteorites during the concentration procedure of the ice samples.
DOI 10.1111/j.1945-5100.2008.tb01021.x
Additional Notes Received 06 September 2007, Revision accepted 29 March 2008, Published Online 26 January 2010
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
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NEBIS System Number 001557309
Source Database ID FORM-1275309430
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@article{Btt2008,
  author = "Botta, Oliver and Martins, Zita and Emmenegger, Christian and Dworkin, Jason P. and Glavin, Daniel P. and Harvey, Ralph P. and Zenobi, Renato and Bada, Jeffrey L. and Ehrenfreund, Pascale",
  title = "{P}olycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from {L}a{P}az {I}cefield, {A}ntarctica",
  journal = "Meteoritics \& planetary science",
  year = 2008,
  volume = "43",
  number = "9",
  pages = "1465--1480",
}


E-Citations record created: Mon, 31 May 2010, 12:37:16 CET