Extraterrestrial nucleobases in the Murchison meteorite

Details Extraterrestrial nucleobases in the Murchison meteorite Extraterrestrial nucleobases in the Murchison meteorite

2008-06-13

arxiv.org/abs/0806.2286v1

Earth and Planetary Science Letters 270, 130-136. 15 June 2008

Physics

Space Physics

31 pages, 4 figures, 3 tables

Scientific paper

10.1016/j.epsl.2008.03.026

Carbon-rich meteorites, carbonaceous chondrites, contain many biologically relevant organic molecules and delivered prebiotic material to the young Earth. We present compound-specific carbon isotope data indicating that measured purine and pyrimidine compounds are indigenous components of the Murchison meteorite. Carbon isotope ratios for uracil and xanthine of delta13C=+44.5per mil and +37.7per mil, respectively, indicate a non-terrestrial origin for these compounds. These new results demonstrate that organic compounds, which are components of the genetic code in modern biochemistry, were already present in the early solar system and may have played a key role in life's origin.

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