Molecular distribution, 13C-isotope, and enantiomeric compositions of carbonaceous chondrite monocarboxylic acids

José C. Aponte, Hannah K. Woodward, Neyda Margarita Abreu, Jamie E. Elsila, Jason P. Dworkin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The water-soluble organic compounds in carbonaceous chondrite meteorites constitute a record of the synthetic reactions occurring at the birth of the solar system and those taking place during parent body alteration and may have been important for the later origins and development of life on Earth. In this present work, we have developed a novel methodology for the simultaneous analysis of the molecular distribution, compound-specific δ13C, and enantiomeric compositions of aliphatic monocarboxylic acids (MCA) extracted from the hot-water extracts of 16 carbonaceous chondrites from CM, CR, CO, CV, and CK groups. We observed high concentrations of meteoritic MCAs, with total carbon weight percentages which in some cases approached those of carbonates and insoluble organic matter. Moreover, we found that the concentration of MCAs in CR chondrites is higher than in the other meteorite groups, with acetic acid exhibiting the highest concentration in all samples. The abundance of MCAs decreased with increasing molecular weight and with increasing aqueous and/or thermal alteration experienced by the meteorite sample. The δ13C isotopic values of MCAs ranged from −52 to +27‰, and aside from an inverse relationship between δ13C value and carbon straight-chain length for C3–C6 MCAs in Murchison, the 13C-isotopic values did not correlate with the number of carbon atoms per molecule. We also observed racemic compositions of 2-methylbutanoic acid in CM and CR chondrites. We used this novel analytical protocol and collective data to shed new light on the prebiotic origins of chondritic MCAs.

Original languageEnglish (US)
Pages (from-to)415-430
Number of pages16
JournalMeteoritics and Planetary Science
Volume54
Issue number2
DOIs
StatePublished - Feb 1 2019

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carbonaceous chondrites
carbonaceous chondrite
meteorites
meteorite
isotopes
chondrites
isotope
chondrite
acids
carbon
acid
thermal alteration
parent body
organic compounds
acetic acid
solar system
water
organic compound
molecular weight
carbonates

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

Aponte, José C. ; Woodward, Hannah K. ; Abreu, Neyda Margarita ; Elsila, Jamie E. ; Dworkin, Jason P. / Molecular distribution, 13C-isotope, and enantiomeric compositions of carbonaceous chondrite monocarboxylic acids. In: Meteoritics and Planetary Science. 2019 ; Vol. 54, No. 2. pp. 415-430.
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Molecular distribution, 13C-isotope, and enantiomeric compositions of carbonaceous chondrite monocarboxylic acids. / Aponte, José C.; Woodward, Hannah K.; Abreu, Neyda Margarita; Elsila, Jamie E.; Dworkin, Jason P.

In: Meteoritics and Planetary Science, Vol. 54, No. 2, 01.02.2019, p. 415-430.

Research output: Contribution to journalArticle

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T1 - Molecular distribution, 13C-isotope, and enantiomeric compositions of carbonaceous chondrite monocarboxylic acids

AU - Aponte, José C.

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AU - Dworkin, Jason P.

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