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Molecular Distribution of Monocarboxylic Acids in Asuka Carbonaceous Chondrites from Antarctica
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Molecular distribution of low-molecular-weight monocarboxylic acids was studied in three CM2 Asuka carbonaceous chondrites (A-881280, A-881334 and A-881458), which were recovered from Antarctica by the 29th Japanese Antarctic Research Expedition in 1988. GC and GC/MS analyses identified more than 30 monocarboxylic acids in A-881458, including aliphatic and aromatic acids with various structural isomers. Isomeric phenolic compounds were also identified. The aliphatic carboxylic acids have straight-chain structures having 2 to 12 carbon atoms (C2 to C12), and branched-chain structures (C4 to C9). The quantities of straight-chain acids decrease logarithmically with increasing carbon number. At the same carbon number, a straight-chain isomer is always predominant compared to branched-chain isomers. All of the 14 possible C4, C5 and C6 aliphatic monocarboxylic acids (not including optical isomers) have been identified, although all the isomers were not reported in Murchison and Y-791198 meteorites. Of the 17 possible isomeric C7 acids, at least 14 isomers were tentatively identified by mass spectra (EI and CI mode). At C8 or above, peaks of branched-chain isomers become obscure, probably due to the large number of isomers and small concentrations. Branched-chain monocarboxylic acids over C6 have never been reported in Muchison. Although occurrence of aliphatic acids are similar between A-881458 and Murchison at C4, C5 and C6 acids, a major difference is that A-881458 as well as Y-791198 have straight-chain predominance among isomers in contrast to Murchison being branched-chain predominant. In the case of isomeric aromatic compounds such as toluic acids and cresols, m-toluic acid and p-cresol are more abundant among their isomers, respectively. The molecular distribution may not reflect thermodynamic equilibrium but rather a kinetically controlled process for their formation mechanism. The other two CM2 chondrites (A-881280 and A-881334) were depleted in carboxylic acids in spite of similar carbon contents. The depletion is not due to weathering on ice, because the degrees of weathering are small and similar among the three chondrites. Probably those latter two chondrites may have been subjected to aqueous alteration or metamorphism on their meteorite parent bodies.
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“Amphiphilic compounds are present in carbonaceous meteorites and can assemble into membranous vesicles (Deamer, 1985; Deamer and Pashley, 1989; Naraoka et al., 1999; Deamer et al. 2002; Deamer and Dworkin, 2005).”
From The Hot Spring Hypothesis for an Origin of Life (2020) · cites this paper as Naraoka et al., 1999
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Gordon, R., & Gordon, N. K. (2024) · Wiley eBooks · doi:10.1002/9781119901228.ch7
Distribution of purine and pyrimidine bases in Antarctic carbonaceous meteorites
Oba, Y., Tomaru, T., Koga, T., Furukawa, Y., SUNAMI, S., Yoshimura, T., Hirakawa, Y., Ogawa, N. O., Ohkouchi, N., Kuwamoto, K., et al. (2026) · Geochimica et Cosmochimica Acta · doi:10.1016/j.gca.2026.06.040
Self-citationEnceladus: Exploring a Habitable Ocean Beyond Earth
Dávila, A. F., Neveu, M. F., Kang, W., Hoehler, T. M., MacKenzie, S., German, C. R., Hurford, T. A., & Eigenbrode, J. L. (2026) · Geosciences · doi:10.3390/geosciences16100405
Mcintosh, O., Millan, M., Buch, A., Freissinet, C., Brucato, J., & Szopa, C. (2026) · Icarus · doi:10.1016/j.icarus.2026.117359
Metadata
- Authors
- Naraoka, H., Shimoyama, A., & Harada, K.
- Affiliations
- University of Tsukuba (JP)
- ORCID
- Naraoka, Hiroshi
- Venue
- Origins of life and evolution of the biosphere
- Published
- 1999-03
- Volume
- 29
- Issue
- 2
- Pages
- 187-201
- ISSN
- 0169-6149 (ISSN-L)
- 1573-0875
- OpenAlex
- W187701066
- Cited by
- 98
- References
- 28
- Citations by year
- 2026: 6 · 2025: 3 · 2024: 8 · 2023: 4 · 2022: 7 · 2021: 4 · 2020: 5 · 2019: 5 · 2018: 6 · 2017: 2 · 2016: 4 · 2015: 1 · 2014: 5 · 2013: 4 · 2012: 1
- FWCI
- 0.82
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Origins of Life and Evolution of Biospheres (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Polar Research
- Topics
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Astro and Planetary Science
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Earth and Planetary Sciences › Space and Planetary Science › Planetary Science and Exploration
- Keywords
- monocarboxylic acids, CM2 chondrites, molecular distribution, isomer distribution, aliphatic carboxylic acids, aromatic carboxylic acids, phenolic compounds, toluic acid, cresols, Murchison meteorite, meteorite weathering
- MeSH terms
- Antarctic Regions, Carbon Isotopes, Carboxylic Acids, Meteoroids
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Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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