Cometary glycine detected in samples returned by Stardust

被引：369

作者：

Elsila, Jamie E. ^{[1
]}

Glavin, Daniel P. ^{[1
]}

Dworkin, Jason P. ^{[1
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

METEORITICS & PLANETARY SCIENCE | 2009年 / 44卷 / 09期

关键词：

INTERSTELLAR ICE ANALOGS; RATIO MASS-SPECTROMETRY; AMINO-ACIDS; ORGANIC-MOLECULES; EARLY EARTH; METEORITES; DELIVERY; SEARCH; 81P/WILD-2;

D O I：

10.1111/j.1945-5100.2009.tb01224.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：

Our previous analysis of cometary samples returned to Earth by NASA's Stardust spacecraft showed several amines and amino acids, but the origin of these Compounds could not be firmly established. Here, we present the stable carbon isotopic ratios of glycine and epsilon-amino-n-caproic acid (EACA), the two most abundant amino acids identified in Stardust-returned foil samples measured by gas chromatography-mass spectrometry Coupled with isotope ratio mass spectrometry. The delta(13)C value for glycine of +29 +/- 6 parts per thousand strongly suggests an extraterrestrial origin for glycine, while the delta(13)C value for EACA of -25 +/- 2 parts per thousand indicates terrestrial contamination by Nylon-6 during curation. This represents the first detection of a cometary amino acid.

引用

页码：1323 / 1330

页数：8

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