Amino Acids Used
Conventional racemization analysis tends to report a D-allosioleucine / L-isoleucine (A/I or D/L ratio). This amino acid ratio has the advantages of being relatively easy to measure and being chronologically useful through the Quaternary.
Reverse phase HPLC techniques can measure up to 9 amino acids useful in geochronology over different time scales on a single chromatogram (Aspartic acid, Glutamic acid, Serine, Alanine, Arginine, Tyrosine, Valine, Phenylalanine, Leucine).
In recent years there have been successful efforts to examine intra-crystalline amino acids separately as they have been shown to improve results in some cases.
Read more about this topic: Amino Acid Dating
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