Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica
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 cho...
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/15630 2023-05-15T13:42:28+02:00 Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica BOTTA, O. MARTINS, Z. EMMENEGGER, C. DWORKIN, J. P. GLAVIN, D. P. HARVEY, R. P. ZENOBI, R. BADA, J. L. EHRENFREUND, P. 2008-01-01 application/pdf https://journals.uair.arizona.edu/index.php/maps/article/view/15630 eng eng Meteoritics & Planetary Science Archives https://journals.uair.arizona.edu/index.php/maps/article/view/15630/15618 https://journals.uair.arizona.edu/index.php/maps/article/view/15630 Meteoritics & Planetary Science Archives; Vol 43, No 9 (2008); 1465-1480 1945-5100 1086-9379 Antarctic meteorites;Organic compounds;Contamination;Chromatography info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2008 ftunivarizonaojs 2020-11-14T17:53:01Z 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, ?-alanine and ?-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 ?-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. Article in Journal/Newspaper Antarc* Antarctic Antarctica Journals at the University of Arizona Antarctic The Antarctic |
institution |
Open Polar |
collection |
Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
Antarctic meteorites;Organic compounds;Contamination;Chromatography |
spellingShingle |
Antarctic meteorites;Organic compounds;Contamination;Chromatography BOTTA, O. MARTINS, Z. EMMENEGGER, C. DWORKIN, J. P. GLAVIN, D. P. HARVEY, R. P. ZENOBI, R. BADA, J. L. EHRENFREUND, P. Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
topic_facet |
Antarctic meteorites;Organic compounds;Contamination;Chromatography |
description |
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, ?-alanine and ?-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 ?-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. |
format |
Article in Journal/Newspaper |
author |
BOTTA, O. MARTINS, Z. EMMENEGGER, C. DWORKIN, J. P. GLAVIN, D. P. HARVEY, R. P. ZENOBI, R. BADA, J. L. EHRENFREUND, P. |
author_facet |
BOTTA, O. MARTINS, Z. EMMENEGGER, C. DWORKIN, J. P. GLAVIN, D. P. HARVEY, R. P. ZENOBI, R. BADA, J. L. EHRENFREUND, P. |
author_sort |
BOTTA, O. |
title |
Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
title_short |
Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
title_full |
Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
title_fullStr |
Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
title_full_unstemmed |
Polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from LaPaz Icefield, Antarctica |
title_sort |
polycyclic aromatic hydrocarbons and amino acids in meteorites and ice samples from lapaz icefield, antarctica |
publisher |
Meteoritics & Planetary Science Archives |
publishDate |
2008 |
url |
https://journals.uair.arizona.edu/index.php/maps/article/view/15630 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
Meteoritics & Planetary Science Archives; Vol 43, No 9 (2008); 1465-1480 1945-5100 1086-9379 |
op_relation |
https://journals.uair.arizona.edu/index.php/maps/article/view/15630/15618 https://journals.uair.arizona.edu/index.php/maps/article/view/15630 |
_version_ |
1766168278956244992 |