Indigenous amino acids in primitive CR meteorites

被引：130

作者：

Martins, Z. ^{[2
]}

Alexander, C. M. O'D. ^{[1
]}

Orzechowska, G. E. ^{[3
]}

Fogel, M. L. ^{[4
]}

Ehrenfreund, P. ^{[2
]}

机构：

[1] Carnegie Inst Washington, Dept Terr Magnetism, Washington, DC 20015 USA

[2] Leiden Inst Chem, Astrobiol Lab, NL-2300 RA Leiden, Netherlands

[3] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[4] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA

来源：

METEORITICS & PLANETARY SCIENCE | 2007年 / 42卷 / 12期

关键词：

D O I：

10.1111/j.1945-5100.2007.tb01013.x

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

CR chondrites are among the most primitive meteorites. In this paper, we report the first measurements of amino acids in Antarctic CR meteorites. Three CRs, Elephant Moraine (EET) 92042, Graves Nunataks (GRA) 95229, and Grosvenor Mountains (GRO) 95577, were analyzed for their amino acid content using high-performance liquid chromatography with UV fluorescence detection (HPLC-FD) and gas chromatography-mass spectrometry (GC-MS). Our data show that EET 92042 and GRA 95229 are the most amino acid-rich chondrites ever analyzed, with total amino acid concentrations ranging from 180 ppm to 249 ppm. The most abundant amino acids present in the EET 92042 and GRA 95229 meteorites are the alpha-amino acids glycine, isovaline, alpha-aminoisobutyric acid (alpha-AIB), and alanine, with delta(13)C values ranging from +31.6%. to +50.5%.. The carbon isotope results together with racemic enantiomeric ratios determined for most amino acids strongly indicate an extraterrestrial origin for these compounds. Compared to Elephant Moraine (EET) 92042 and GRA 95229, the more aqueously altered GRO 95577 is depleted in amino acids. In both CRs and CMs, the absolute amino acid abundances appear to be related to the degree of aqueous alteration in their parent bodies. In addition, the relative abundances of

引用

页码：2125 / 2136

页数：12

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