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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.

These are also preserved in sediments which accumulated as a response to global climatic pulses, during the Pleistocene and beyond.

Therefore, amino acid geochronology has the potential to be widely applicable to the chronology of human evolution, as well as to the geological record.

Amino acids are the "building blocks," or sub-units, of proteins.

This technique relates changes in amino acid molecules to the time elapsed since they were formed. All amino acids except glycine (the simplest one) are optically active, having a stereocenter at their α-C atom.

The amino acids combine with each other like the links of a chain to form a long protein chain.

Proteins contain from 50 to several hundred amino acids.

The authors of this particular paper went on to suggest that, "As conformation strongly influences the rate of Asu [cyclic succinimide] formation and hence Asx [aspartic acid asparagine] racemization, the use of extrapolation from high temperatures to estimate racemization kinetics of Asx in proteins below their denaturation temperature is called into question . In the position carboxyl to asparagine in the peptide the replacement of glycine with a bulky amino acid such as proline or leucine resulted in a 33-50-fold decrease in the rate of deamidation"Hydrolysis, or the process of breaking down a protein into smaller and smaller fragments, clearly affects the rate of racemization.

The rate itself of hydrolysis "depends on the strength of the individual peptide bonds, which in turn is determined by the characteristics of the amino acids on either side of the bond, the presence of water and the temperature."All of these are confounding factors, which, if not known exactly over extended periods of time, would play havoc with any sort of age determinations.

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