Abstract
Aspartic acid from an HC1 hydrolyzed portion of 20–25th Dynasty Egyptian bone gave a D/L value of 0.28. Various peptide and molecular weight fractions separated before hydrolysis from another aliquot of the same bone portion yielded D/L aspartic acid values ranging from 0.09 to 0.68. Higher molecular weight and higher content of hydrophobic amino acids are factors leading to lower D/L aspartic acid values. Insoluble, high molecular weight polypeptide residues showed very low D/L aspartic acid values of 0.09. We propose that particularly stable peptides be isolated and characterized and then used for comparison with similarly isolated peptides from other fossil bone samples for purposes of age estimation.
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