Abstract
Molecular distribution of low-molecular-weight monocarboxylic acids was studied in three CM2 Asuka carbonaceous chondrites (A-881280, A-881334 and A-881458), which were recovered from Antarctica by the 29th Japanese Antarctic Research Expedition in 1988. GC and GC/MS analyses identified more than 30 monocarboxylic acids in A-881458, including aliphatic and aromatic acids with various structural isomers. Isomeric phenolic compounds were also identified. The aliphatic carboxylic acids have straight-chain structures having 2 to 12 carbon atoms (C2 to C12), and branched-chain structures (C4 to C9). The quantities of straight-chain acids decrease logarithmically with increasing carbon number. At the same carbon number, a straight-chain isomer is always predominant compared to branched-chain isomers. All of the 14 possible C4, C5 and C6 aliphatic monocarboxylic acids (not including optical isomers) have been identified, although all the isomers were not reported in Murchison and Y-791198 meteorites. Of the 17 possible isomeric C7 acids, at least 14 isomers were tentatively identified by mass spectra (EI and CI mode). At C8 or above, peaks of branched-chain isomers become obscure, probably due to the large number of isomers and small concentrations. Branched-chain monocarboxylic acids over C6 have never been reported in Murchison. Although occurrence of aliphatic acids are similar between A-881458 and Murchison at C4, C5 and C6 acids, a major difference is that A-881458 as well as Y-791198 have straight- chain predominance among isomers in contrast to Murchison being branched-chain predominant. In the case of isomeric aromatic compounds such as toluic acids and cresols, m-toluic acid and p-cresol are more abundant among their isomers, respectively. The molecular distribution may not reflect thermodynamic equilibrium but rather a kinetically controlled process for their formation mechanism. The other two CM2 chondrites (A-881280 and A-881334) were depleted in carboxylic acids in spite of similar carbon contents. The depletion is not due to weathering on ice, because the degrees of weathering are small and similar among the three chondrites. Probably those latter two chondrites may have been subjected to aqueous alteration or metamorphism on their meteorite parent bodies.
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Akai, J.: 1990, Proc. NIPR Symp. Antarct. Meteorites 3, 68.
Akai, J.: 1992, Proc. NIPR Symp. Antarct. Meteorites 5, 120.
Becker, R. H. and Epstein, S.: 1982, Geochim. Cosmochim. Acta 46, 97.
Cronin, J. R., Pizzarello, S. and Cruikshank, D. P.: 1988, in Kerridge, J. F. and Matthews, M. S. (eds.), Meteorites and the Early Solar System, Univ. Arizona Press, p. 819.
Deamer, D.W., Mahon, E. H. and Bosco, G.: 1994, in Bengtson, S. (ed.), Early Life on Earth. Nobel Symposium No. 84. Columbia U. P., New York, p. 107.
Deines, P.: 1980, in Fritz, P. and Fontes, J. C. (eds.), Handbook of Environmental Isotope Geochemistry Vol. 1, Elsevier, p. 329.
Epstein, S., Krishnamurthy, R. V., Cronin, J. R., Pizzarello, S. and Yuen, G. U.: 1987, Nature 325, 477.
Hayatsu, R. and Anders, E.: 1981, Topics Curr. Chem. 99, 1.
Hayes, J. M.: 1967, Geochim. Cosmochim. Acta 31, 1395.
Kerridge, J. F.: 1985, Geochim. Cosmochim. Acta 49, 1707.
Kojima, H., Ikeda, Y., and Yanai, K.: 1984, Mem. Natl Inst. Polar Res., Spec. Issue 35, 184.
Krishnamurthy, R. V., Epstein, S., Cronin, J. R., Pizzarello, S. and Yuen, G. U.: 1992, Geochim. Cosmochim. Acta 56, 4045.
Lawless, J. G. and Yuen, G. U.: 1979, Nature 242, 396.
Legrand, M., Feniet-Saigne, C., Saltzman, E. S., Germain, C., Barkov, N. I. and Petrov, V. N.: 1991, Nature 350, 144.
Miller, S. L., Urey, H. C. and Oro, J.: 1976, J. Mol. Evol. 9, 59.
Nagy, B. and Bitz, S. M. C.: 1963, Arch. Biochem. Biophysic 101, 240.
Naraoka, H., Shimoyama, A., Komiya, M., Yamamoto, H. and Harada, K.: 1988, Chem. Lett. 1988, 831.
Naraoka, H., Shimoyama, A. and Harada, K.: 1990, Abstr. 15th Symp. Antarct. Meteor. National Institute of Polar Research, Tokyo.
Naraoka, H., Shimoyama, A., Matsubaya, O. and Harada, K.: 1997, Geochem. J. 31, 155.
Shimoyama, A. and Harada, K.: 1984, Geochem. J. 18, 281.
Shimoyama, A., Ponnamperuma, C. and Yanai, K.: 1979, Nature 282, 394.
Shimoyama, A., Harada, K. and Yanai, K.: 1985, Chem. Lett. 1985, 1183.
Shimoyama, A., Naraoka, H., Yamamoto, H. and Harada, K.: 1986, Chem. Lett. 1986, 1561.
Shimoyama, A., Naraoka, H., Komiya, M. and Harada, K.: 1989, Geochem. J. 23, 181.
Shock, E. L.: 1990, Origins Life Evol. Biosphere 20, 331.
Shock, E. L.: 1995, Amer. J. Sci. 295, 496.
Shock, E. L. and Schulte, M. D.: 1990, Nature 343, 728.
Stull, D. R., Westrum, Jr., E. F. and Sinke, G. C.: 1969, The Chemical Thermodynamics of Organic Compounds, John Wiley & Sons, New York.
Weltner Jr, W. and Van Zee, R. J.: 1989, Chem. Rev. 89, 1713.
Yanai, K., Kojima, H. and Naraoka, H.: 1993, Proc. NIPR Symp. Antarct. Meteorites 6, 137.
Yanai, K. and Kojima, H.: 1995, Catalog of the Antarctic Meteorites: Collected from December 1969 to December 1994, with Special Reference to those Represented in the Collections of the National Institute of Polar Research, National Institute of Polar Research, Tokyo.
Yuen, G. U. and Kvenvolden, K. A.: 1973, Nature 246, 301.
Yuen, G., Blair, N., Des Marais, D. J. and Chang, S.: 1984, Nature 307, 252.
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Naraoka, H., Shimoyama, A. & Harada, K. Molecular Distribution of Monocarboxylic Acids in Asuka Carbonaceous Chondrites from Antarctica. Orig Life Evol Biosph 29, 187–201 (1999). https://doi.org/10.1023/A:1006547127028
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DOI: https://doi.org/10.1023/A:1006547127028