High-mass resolution molecular imaging of organic compounds on the surface of Murchison meteorite

Minako Hashiguchi, Hiroshi Naraoka

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

High-resolution mass spectrometry (HRMS) imaging by desorption electrospray ionization (DESI) coupled with Orbitrap MS using methanol (MeOH) spray was performed on a fragment of the Murchison (CM2) meteorite in this study. Homologues of C n H 2n–1 N 2 + (n = 7–9) and C n H 2n NO + (n = 9–14) were detected on the sample surface by the imaging. A high-performance liquid chromatography (HPLC)/HRMS analysis of MeOH extracts from the sample surface after DESI/HRMS imaging indicated that the C n H 2n–1 N 2 + homologues corresponds to alkylimidazole, and that a few isomers of the C n H 2n NO + homologues present in the sample. The alkylimidazoles and C n H 2n NO + homologues displayed different spatial distributions on the surface of the Murchison fragment, indicating chromatographic separation effects during aqueous alteration. Moreover, the distribution pattern of compounds is also different among homologues. This is probably also resulting from the separation of isomers by similar chromatographic effects, or different synthetic pathways. Alkylimidazoles and the C n H 2n NO + homologues are mainly distributed in the matrix region of the Murchison by mineralogical observations, which is consistent with previous reports. Altered minerals (e.g., Fe-oxide, Fe-sulfide, and carbonates) occurred in this region. However, no clear relationship was found between these minerals and the organic compounds detected by DESI/HRMS imaging. Although this result might be due to scale differences between the spatial resolution of DESI/HRMS imaging and the grain size in the matrix of the Murchison, our results would indicate that alkylimidazoles and the C n H 2n NO + homologues in the Murchison fragment were mainly synthesized by different processes from hydrothermal alteration on the parent body.

Original languageEnglish
Pages (from-to)452-468
Number of pages17
JournalMeteoritics and Planetary Science
Volume54
Issue number2
DOIs
Publication statusPublished - Feb 1 2019

Fingerprint

Murchison meteorite
organic compounds
organic compound
mass spectroscopy
mass spectrometry
desorption
ionization
high resolution
fragments
isomers
minerals
matrix
distribution (property)
parent body
liquid chromatography
mineral
matrices
hydrothermal alteration
spray
sprayers

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Space and Planetary Science

Cite this

High-mass resolution molecular imaging of organic compounds on the surface of Murchison meteorite. / Hashiguchi, Minako; Naraoka, Hiroshi.

In: Meteoritics and Planetary Science, Vol. 54, No. 2, 01.02.2019, p. 452-468.

Research output: Contribution to journalArticle

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