Atypical Amino Acid Structural and Isotopic Compositions in the CR2 Chondrite Miller Range 090001 and the CH3 Chondrite Sayh al Uhaymir

Carbonaceous chondrites contain broad suites of amino acids that vary in abundance and structural complexity depending on the meteorite par-ent body mineralogy and alteration history [1 – 4]. CR chondrites of petrologic types 2 and 3 and CH3 chon-drites have been shown to be particularly rich in amino acids, although the structural distributions of amino acids differ appreciably between the CR and CH chon-drites. Insights into the synthetic environment and for-mation chemistry of meteoritic amino acids have been gained through careful analysis of the structural, enan-tiomeric and isotopic compositions of meteoritic amino acids [2, 5-7]. Compound-specific isotopic analyses are particularly informative, but require larger sample sizes than structural and enantiomeric measurements. Con-sequently, isotopic measurements are typically limited to meteorites recovered in large masses or that contain very high abundances of amino acids. Here we report on the structural, enantiomeric and isotopic composi-tions of amino acids in two large meteorites, the CR2 Miller Range (MIL) 090001 (>6 kg recovered mass) and the CH3 Sayh al Uhaymir (SaU) 290 (~1.8 kg re-covered mass).