Amino Acids From the Yamato-791198 Carbonaceous Chondrite From Antarctica

Abstract

The Yamato-791198 carbonaceous chondrite yielded indigenous amino acids. These consitst of various structural and optical isomers, indicating abiotic in origin. The amount of these amino acids is the largest of carbonaceous chondrites studied so far. Terrestrial organic contamination was nil to this chondrite.

Search for nucleic acid bases in carbonaceous chondrites from Antarctica.

“…In addition, the amounts of amino acids in the two chondrites (Shimoyama et al, 1985) are also at the same concentration level. as that in Murchison (Cronin et al, 1979), although the abundances of the nitrogen bases are approximately two orders of magnitude less than those of amino acids in these Antarctic and non-Antarctic carbonaceous chondrites.…”

“…It was shown later, by Stocks and Schwartz (1981b), that the silylating agent con tained impurities which could have been con verted to the 4-hydroxypyrimidines reported by the first group. 1985), together with Yamato-793321 and Belgica-7904 which contain little amino acids and are nearly free from terrestrial contamination (Shimoyama and Harada, 1984). These four chondrites belong to the CM2 type (Yanai and Kojima, 1987), as does Murchison, although the possibili ty remains that Belgica-7904 might be C1 (CI) as pointed out from the oxygen isotopic study (Mayeda et al, 1987).…”

“…Several samples of these chondrites have been available for organic analyses, and we have shown the presence of extraterrestrial organic compounds, such as amino acids 1985), carboxylic acids (Shimoyama et al, 1986 and1989), and hydrocarbons (Naraoka et al, 1988;Shimoyama et al, 1989) in Yamato-74662 and Yamato 791198. Other researchers also found amino acids from an Allan Hills carbonaceous chon drite (Cronin et al, 1979;Holzer and Oro, 1979;Kotra et al, 1979).…”

Analyses of carboxylic acids and hydrocarbons in Antarctic carbonaceous chondrites, Yamato-74662 and Yamato-793321.

“…Subsequently, we analyzed for amino acids another Antarctic carbonaceous chondrite, Yamato-791198 (Shimoyama et al, 1985). Hav ing ensured the presence of indigenous amino acids and little terrestrial organic contamination to the chondrite, we extended our analysis to car boxylic acids (Shimoyama et al, 1986) and hydrocarbons (Naraoka et al, 1988) in the chon drite.…”

Enantioselective Determination of Extraterrestrial Amino Acids Using a Two-Dimensional Chiral High-Performance Liquid Chromatographic System

“…After the discovery of the Murchison meteorite, several carbonaceous chondrites were investigated and the presence of various amino acids including non-proteinogenic ones was demonstrated [8][9][10][11][12][13][14][15]. For some of the amino acids, an excess of one enantiomer compared to the opposite isomer was also found [16][17][18].…”