Indigenous amino acids in primitive CR meteorites
CR chondrites are among the most primitive meteorites. In this paper, we report the first measurements of amino acids in Antarctic CR meteorites. Three CRs, Elephant Moraine (EET) 92042, Graves Nunataks (GRA) 95229, and Grosvenor Mountains (GRO) 95577, were analyzed for their amino acid content usin...
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/15532 2023-05-15T13:42:28+02:00 Indigenous amino acids in primitive CR meteorites MARTINS, Z. ALEXANDER, C. M. OD. ORZECHOWSKA, G. E. FOGEL, M. L. EHRENFREUND, P. 2007-01-01 application/pdf https://journals.uair.arizona.edu/index.php/maps/article/view/15532 eng eng Meteoritics & Planetary Science Archives https://journals.uair.arizona.edu/index.php/maps/article/view/15532/15520 https://journals.uair.arizona.edu/index.php/maps/article/view/15532 Meteoritics & Planetary Science Archives; Vol 42, No 12 (2007); 2125-2136 1945-5100 1086-9379 CR carbonaceous chondrite Meteorites;Organic matter;Weathering info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2007 ftunivarizonaojs 2020-11-14T17:53:01Z CR chondrites are among the most primitive meteorites. In this paper, we report the first measurements of amino acids in Antarctic CR meteorites. Three CRs, Elephant Moraine (EET) 92042, Graves Nunataks (GRA) 95229, and Grosvenor Mountains (GRO) 95577, were analyzed for their amino acid content using high-performance liquid chromatography with UV fluorescence detection (HPLC-FD) and gas chromatographymass spectrometry (GC-MS). Our data show that EET 92042 and GRA 95229 are the most amino acidrich chondrites ever analyzed, with total amino acid concentrations ranging from 180 ppm to 249 ppm. The most abundant amino acids present in the EET 92042 and GRA 95229 meteorites are the -amino acids glycine, isovaline, -aminoisobutyric acid (-AIB), and alanine, with 13C values ranging from +31.6 to +50.5. The carbon isotope results together with racemic enantiomeric ratios determined for most amino acids strongly indicate an extraterrestrial origin for these compounds. Compared to Elephant Moraine (EET) 92042 and GRA 95229, the more aqueously altered GRO 95577 is depleted in amino acids. In both CRs and CMs, the absolute amino acid abundances appear to be related to the degree of aqueous alteration in their parent bodies. In addition, the relative abundances of -AIB and -alanine in the Antarctic CRs also appear to depend on the degree of aqueous alteration. Article in Journal/Newspaper Antarc* Antarctic Journals at the University of Arizona Antarctic Elephant Moraine ENVELOPE(157.233,157.233,-76.300,-76.300) Graves Nunataks ENVELOPE(-141.500,-141.500,-86.717,-86.717) Grosvenor Mountains ENVELOPE(175.000,175.000,-85.667,-85.667) The Antarctic |
institution |
Open Polar |
collection |
Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
CR carbonaceous chondrite Meteorites;Organic matter;Weathering |
spellingShingle |
CR carbonaceous chondrite Meteorites;Organic matter;Weathering MARTINS, Z. ALEXANDER, C. M. OD. ORZECHOWSKA, G. E. FOGEL, M. L. EHRENFREUND, P. Indigenous amino acids in primitive CR meteorites |
topic_facet |
CR carbonaceous chondrite Meteorites;Organic matter;Weathering |
description |
CR chondrites are among the most primitive meteorites. In this paper, we report the first measurements of amino acids in Antarctic CR meteorites. Three CRs, Elephant Moraine (EET) 92042, Graves Nunataks (GRA) 95229, and Grosvenor Mountains (GRO) 95577, were analyzed for their amino acid content using high-performance liquid chromatography with UV fluorescence detection (HPLC-FD) and gas chromatographymass spectrometry (GC-MS). Our data show that EET 92042 and GRA 95229 are the most amino acidrich chondrites ever analyzed, with total amino acid concentrations ranging from 180 ppm to 249 ppm. The most abundant amino acids present in the EET 92042 and GRA 95229 meteorites are the -amino acids glycine, isovaline, -aminoisobutyric acid (-AIB), and alanine, with 13C values ranging from +31.6 to +50.5. The carbon isotope results together with racemic enantiomeric ratios determined for most amino acids strongly indicate an extraterrestrial origin for these compounds. Compared to Elephant Moraine (EET) 92042 and GRA 95229, the more aqueously altered GRO 95577 is depleted in amino acids. In both CRs and CMs, the absolute amino acid abundances appear to be related to the degree of aqueous alteration in their parent bodies. In addition, the relative abundances of -AIB and -alanine in the Antarctic CRs also appear to depend on the degree of aqueous alteration. |
format |
Article in Journal/Newspaper |
author |
MARTINS, Z. ALEXANDER, C. M. OD. ORZECHOWSKA, G. E. FOGEL, M. L. EHRENFREUND, P. |
author_facet |
MARTINS, Z. ALEXANDER, C. M. OD. ORZECHOWSKA, G. E. FOGEL, M. L. EHRENFREUND, P. |
author_sort |
MARTINS, Z. |
title |
Indigenous amino acids in primitive CR meteorites |
title_short |
Indigenous amino acids in primitive CR meteorites |
title_full |
Indigenous amino acids in primitive CR meteorites |
title_fullStr |
Indigenous amino acids in primitive CR meteorites |
title_full_unstemmed |
Indigenous amino acids in primitive CR meteorites |
title_sort |
indigenous amino acids in primitive cr meteorites |
publisher |
Meteoritics & Planetary Science Archives |
publishDate |
2007 |
url |
https://journals.uair.arizona.edu/index.php/maps/article/view/15532 |
long_lat |
ENVELOPE(157.233,157.233,-76.300,-76.300) ENVELOPE(-141.500,-141.500,-86.717,-86.717) ENVELOPE(175.000,175.000,-85.667,-85.667) |
geographic |
Antarctic Elephant Moraine Graves Nunataks Grosvenor Mountains The Antarctic |
geographic_facet |
Antarctic Elephant Moraine Graves Nunataks Grosvenor Mountains The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Meteoritics & Planetary Science Archives; Vol 42, No 12 (2007); 2125-2136 1945-5100 1086-9379 |
op_relation |
https://journals.uair.arizona.edu/index.php/maps/article/view/15532/15520 https://journals.uair.arizona.edu/index.php/maps/article/view/15532 |
_version_ |
1766168256078413824 |