Investigation of Isovaline Enantiomeric Excesses and Other C5 Amino Acids in Carbonaceous Meteorites

摘要

Instead of the gas chromatography-mass spectrometry (GC–MS) technique employed by Pizzarello et al., we have used liquid chromatography-fluorescence detection/time of flightmass spectrometry (LC-FD/ToF-MS) to study the enantiomeric ratio of isovaline in the CM2 meteorites Murchison and LEW90500 and the CR2 QUE99177. We have placed particular emphasis on understanding the suite of C5 amino acids in these meteorites. In doing so, we have determined that D and L 3-aminopentanoic acid co-elutes with Lisovaline and L-valine under common chromatographic conditions (Glavin and Dworkin 2006) for o-phthaldialdehyde/N-acetyl-L-cysteine (OPA/NAC).