  A specific 4641Da amino acid polymer entity is present in two CV3 meteorites
Acfer 086 and Allende, together with its breakdown polymer fragments of mass <
2000Da. Previously in Allende and Murchison meteorites we had detected polymer
amide of mass < 2000Da using a new method based on Folch extraction of micron
meteoritic particles with hydrophilic and hydrophobic phases. Low temperature
extraction kept polymer amide intact whereas previous methods had resulted in
degradation via boiling the samples. Acfer 086 and Allende polymer amide
composition was predominantly glycine with partial content of hydroxy-glycine
and alanine. Detection was via matrix-assisted laser desorption time-of-flight
mass spectrometry (MALDI/TOF/MS). Amino acid analysis showed that the amino
acids present were almost entirely bound in polymers prior to acid hydrolysis.
Fragment analysis provided a possible subunit structure for the 4641 species.
In the Allende polymer fragment data heavy isotope satellite enhancement
confirmed an extraterrestrial origin that could be in the interstellar medium
or the protoplanetary disc. The dominance of 4641Da polymer amide suggested a
replication or concentration mechanism. Analysis of the infrared modes of a
proposed structure showed a peak in collective mode intensity at 20 residue
length, giving a possible explanation in terms of optimized energy absorption
for the dominance of this size of linear glycine-based structure.
