Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios
Abstract A novel method has been developed for compound-specific nitrogen isotope compositions with an achiral column which was previously shown to offer high precision for nitrogen isotopic analysis. We applied the method to determine the amino acid contents and stable nitrogen isotopic composition...
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ftbiomed:oai:biomedcentral.com:s40623-016-0382-8 2023-05-15T14:03:30+02:00 Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios Chan, Queenie Chikaraishi, Yoshito Takano, Yoshinori Ogawa, Nanako Ohkouchi, Naohiko 2016-01-21 http://www.earth-planets-space.com/content/68/1/7 en eng BioMed Central Ltd. http://www.earth-planets-space.com/content/68/1/7 Copyright 2016 Chan et al. Carbonaceous chondrites Meteorites Astrochemistry Compound-specific isotopic analysis Nitrogen isotopes Amino acids Organic materials Meteoritic composition Gas chromatography/combustion/isotope ratio mass spectrometry Letter 2016 ftbiomed 2016-01-24T01:08:24Z Abstract A novel method has been developed for compound-specific nitrogen isotope compositions with an achiral column which was previously shown to offer high precision for nitrogen isotopic analysis. We applied the method to determine the amino acid contents and stable nitrogen isotopic compositions of individual amino acids from the thermally metamorphosed (above 500 °C) Antarctic carbonaceous chondrites Ivuna-like (CI)1 (or CI-like) Yamato (Y) 980115 and Ornans-like (CO)3.5 Allan Hills (ALH) A77003 with the use of gas chromatography/combustion/isotope ratio mass spectrometry. ALHA77003 was deprived of amino acids due to its extended thermal alteration history. Amino acids were unambiguously identified in Y-980115, and the δ 15 N values of selected amino acids (glycine +144.8 ‰; α-alanine +121.2 ‰) are clearly extraterrestrial. Y-980115 has experienced an extended period of aqueous alteration as indicated by the presence of hydrous mineral phases. It has also been exposed to at least one post-hydration short-lived thermal metamorphism. Glycine and alanine were possibly produced shortly after the accretion event of the asteroid parent body during the course of an extensive aqueous alteration event and have abstained from the short-term post-aqueous alteration heating due to the heterogeneity of the parent body composition and porosity. These carbonaceous chondrite samples are good analogs that offer important insights into the target asteroid Ryugu of the Hayabusa-2 mission, which is a C-type asteroid likely composed of heterogeneous materials including hydrated and dehydrated minerals. Manuscript Antarc* Antarctic BioMed Central Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Antarctic Ryugu ENVELOPE(44.033,44.033,-67.967,-67.967) Yamato ENVELOPE(35.583,35.583,-71.417,-71.417) |
institution |
Open Polar |
collection |
BioMed Central |
op_collection_id |
ftbiomed |
language |
English |
topic |
Carbonaceous chondrites Meteorites Astrochemistry Compound-specific isotopic analysis Nitrogen isotopes Amino acids Organic materials Meteoritic composition Gas chromatography/combustion/isotope ratio mass spectrometry |
spellingShingle |
Carbonaceous chondrites Meteorites Astrochemistry Compound-specific isotopic analysis Nitrogen isotopes Amino acids Organic materials Meteoritic composition Gas chromatography/combustion/isotope ratio mass spectrometry Chan, Queenie Chikaraishi, Yoshito Takano, Yoshinori Ogawa, Nanako Ohkouchi, Naohiko Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
topic_facet |
Carbonaceous chondrites Meteorites Astrochemistry Compound-specific isotopic analysis Nitrogen isotopes Amino acids Organic materials Meteoritic composition Gas chromatography/combustion/isotope ratio mass spectrometry |
description |
Abstract A novel method has been developed for compound-specific nitrogen isotope compositions with an achiral column which was previously shown to offer high precision for nitrogen isotopic analysis. We applied the method to determine the amino acid contents and stable nitrogen isotopic compositions of individual amino acids from the thermally metamorphosed (above 500 °C) Antarctic carbonaceous chondrites Ivuna-like (CI)1 (or CI-like) Yamato (Y) 980115 and Ornans-like (CO)3.5 Allan Hills (ALH) A77003 with the use of gas chromatography/combustion/isotope ratio mass spectrometry. ALHA77003 was deprived of amino acids due to its extended thermal alteration history. Amino acids were unambiguously identified in Y-980115, and the δ 15 N values of selected amino acids (glycine +144.8 ‰; α-alanine +121.2 ‰) are clearly extraterrestrial. Y-980115 has experienced an extended period of aqueous alteration as indicated by the presence of hydrous mineral phases. It has also been exposed to at least one post-hydration short-lived thermal metamorphism. Glycine and alanine were possibly produced shortly after the accretion event of the asteroid parent body during the course of an extensive aqueous alteration event and have abstained from the short-term post-aqueous alteration heating due to the heterogeneity of the parent body composition and porosity. These carbonaceous chondrite samples are good analogs that offer important insights into the target asteroid Ryugu of the Hayabusa-2 mission, which is a C-type asteroid likely composed of heterogeneous materials including hydrated and dehydrated minerals. |
format |
Manuscript |
author |
Chan, Queenie Chikaraishi, Yoshito Takano, Yoshinori Ogawa, Nanako Ohkouchi, Naohiko |
author_facet |
Chan, Queenie Chikaraishi, Yoshito Takano, Yoshinori Ogawa, Nanako Ohkouchi, Naohiko |
author_sort |
Chan, Queenie |
title |
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
title_short |
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
title_full |
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
title_fullStr |
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
title_full_unstemmed |
Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
title_sort |
amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios |
publisher |
BioMed Central Ltd. |
publishDate |
2016 |
url |
http://www.earth-planets-space.com/content/68/1/7 |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(44.033,44.033,-67.967,-67.967) ENVELOPE(35.583,35.583,-71.417,-71.417) |
geographic |
Allan Hills Antarctic Ryugu Yamato |
geographic_facet |
Allan Hills Antarctic Ryugu Yamato |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://www.earth-planets-space.com/content/68/1/7 |
op_rights |
Copyright 2016 Chan et al. |
_version_ |
1766274187219959808 |