Computer Science
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41..961v&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, July 1977, p. 961-968.
Computer Science
23
Biogeochemistry, Carbonaceous Chondrites, Meteoritic Composition, Purines, Pyrimidines, Gas Chromatography, Guanines, Liquid Chromatography, Ultraviolet Spectroscopy, Xanthines
Scientific paper
A 1-g interior sample of the Murchison CII meteorite was examined for the presence of purines and pyrimidines by dual-column ion-exclusion chromatography and ultraviolet spectroscopy. Xanthine, not previously reported in meteorites, was found to be the major purine liberated by extraction with formic acid, with a concentration corresponding to 2.3 micrograms per gram of meteorite. Guanine (0.1 ppm) and hypoxanthine (0.04 ppm) were also tentatively identified. The presence of adenine could not be confirmed. No pyrimidines were detected at concentrations higher than the background level (0.01 ppm) in water, formic acid, or strong acid extracts. Silylation of the water extract, however, resulted in the appearance of 4-hydroxypyrimidine, 4-hydroxy-2-methylpyrimidine, and 4-hydroxy-6-methylpyrimidine. These compounds are thought to be formed during the silylation procedure from contaminants present in the reagent.
Schwartz Alan W.
van der Velden W.
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