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Polymers of amino acids have been found in Allende and Acfer 086, withextra-terrestrial origin evidenced by isotopically enhanced satellite peaks inthe 800-1200 Dalton mass range. The present work employs focused ion beammilling of micron scale powder to generate negative ion spectra containing CNions at masses 26 and 27 for 15N determination. Respectively, for CN ions,Allende and Acfer 086 show delta 15N = 410 +/- 220 per mil and 1,015 +/- 220per mil in the powder samples. We measure an exact 1:2 ratio of C2 to CNnegative ions that is consistent with ion beam fragmentation of a polymer amide-CCN- backbone into diatomic fragments. It is inferred that polymer amidecomprises a large part of the 15N bearing organic material in this CV3meteorite class.

Polymer amide as a carrier of 15N in Allende and Acfer 086 meteorites