Cometary glycine detected in samples returned by Stardust
Cometary glycine detected in samples returned by Stardust
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DOI：
10.1111/j.1945-5100.2009.tb01224.x
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发表时间：
2009-09-01
影响因子：
2.2
通讯作者：
Dworkin, Jason P.
中科院分区：
文献类型：
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作者：
Elsila, Jamie E.;Glavin, Daniel P.;Dworkin, Jason P.
我们之前对由美国宇航局星尘号飞船返回地球的彗星样本进行的分析显示出多种胺和氨基酸，但这些化合物的来源无法确定。在这里，我们提出了甘氨酸和ε-氨基-正己酸（EACA）的稳定碳同位素比率，这两种氨基酸是通过气相色谱-质谱联用和同位素比质谱法测量的，在星尘返回的箔样品中鉴定出两种最丰富的氨基酸。甘氨酸的 delta(13)C 值为 +29 +/- 6 ppm，强烈表明甘氨酸来自外星，而 EACA 的 delta(13) C 值为 -25 +/- 2 ppm，表明在处理过程中受到 Nylon-6 的陆地污染。这是首次检测到彗星氨基酸。
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.