Aspartic acid racemization dating

Goodfriend and Hare (1995) show that Asx racemization in ostrich eggshell heated at 80Clearly this is a dramatic adjustment that seems to suggest that amino acid racemization may be more a reflection of the activities of local environmental differences than any sort of differences in relative ages.

The state of preservation of the bone appears to be as important an issue for radiocarbon dating as it is for AAR dating."So, what do we have?"Stafford et al., (1991) discussed AMS radiocarbon dating in bone at the molecular level.They dated a number of fractions (ranging from insoluble collagen to individual amino acids) from each of a selection of differentially preserved mammoth and human bone.Again, those like Goodfriend and Hare (1995) have pointed out the "difficulties in estimating the amount of asparagine in proteins and reminded researchers of the dangers of extrapolating from the behaviour of pure Asn in solution at high temperature, to the behaviour of Asn in proteins associated with biominerals at ambient temperature . The rate of racemization can not be standardized by itself because it is too changeable.Thus, because of the rate problem, this dating technique must rely on other dating techniques to standardize its findings.