Amino acid racemization dating: Evidence of apparent reversal in aspartic acid racemization with time in shells of Ostrea

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Scientific paper

Data have been obtained for simulated laboratory aging of shell valves of Ostrea angasi Sowerby. In respect to the conversion of L to D aspartic acid in peptides of > 1000 Dallons there was consistently an initial increase in D / L ratio followed by a progressive decrease in D / L with time. This phenomenon provides further insight into the dynamics of the racemization process. It may also be a significant factor influencing D / L ratios measured for total hydrolysable amino acids from natural fossils for the purposes of dating or correlation.

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