Detection of Non-aromatic Organic Compounds in Meteorites using Imaging Laser Desorption/Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Details Detection of Non-aromatic Organic Compounds in Meteorites using Imaging Laser Desorption/Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry Detection of Non-aromatic Organic Compounds in Meteorites using Imaging Laser Desorption/Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11a1196s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P11A-1196

Biology

[0424] Biogeosciences / Biosignatures And Proxies, [0452] Biogeosciences / Instruments And Techniques, [5215] Planetary Sciences: Astrobiology / Origin Of Life, [6240] Planetary Sciences: Solar System Objects / Meteorites And Tektites

Scientific paper

Our most extensive understanding of extraterrestrial organic matter is based on what has been learned from meteorites that have been delivered naturally to Earth. Meteorites have been analyzed by a variety of techniques ranging from extensive sample preparation with extraction and subsequent chromatography to direct laser desorption mass spectrometry (LDMS). While extraction studies have reported a variety of organics (e.g., aliphatic and aromatic hydrocarbons, ketones, aldehydes, and amino acids), LDMS studies have only reported polycyclic aromatic hydrocarbons (PAHs). This is rather surprising considering that Yan et al. (Talanta 2007, 72, 634-641) reported that even a small amount of PAH enables the detection of organics that are not otherwise ionized during the desorption event from minerals. Therefore, we have begun re-investigating meteorites because, regardless of the source of the organic compounds, the presences of PAHs should allow other organic molecules to be observed using imaging laser desorption/ionization Fourier transform ion cyclotron resonance mass spectrometry (LD-FTICR-MS). Indeed, we have mapped meteorites (e.g., EETA 79001) and found many mass-to-charge peaks that are non-aromatic as determined by analysis of their mass defects. Mapping also revealed that the distribution of organics is heterogeneous, which necessitates the collection of a mass spectrum from a single laser shot so that minor peaks of interest are not lost in signal averaging. These studies have implications for analyzing future returned samples from Mars or elsewhere with minimal preparation or damage.

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