Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones

In the time interval datable by radiocarbon, and at the temperatures of most archeological sites, a substantial amount of racemization of aspartic acid takes place. By determination of the amount of racemization of aspartic acid in bones from a particular location which have been dated by the radioc...

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Main Authors: Bada, Jeffrey L., Protsch, Reiner
Formato: Artigo
Idioma:en
Publicado em: 1973
Assuntos:
Biological Sciences: Anthropology
Acesso em linha:https://ncbi.nlm.nih.gov/pmc/articles/PMC433490/
https://ncbi.nlm.nih.gov/pubmed/16592082
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spelling pubmed-4334902004-07-30 Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones Bada, Jeffrey L. Protsch, Reiner Proc Natl Acad Sci U S A Biological Sciences: Anthropology In the time interval datable by radiocarbon, and at the temperatures of most archeological sites, a substantial amount of racemization of aspartic acid takes place. By determination of the amount of racemization of aspartic acid in bones from a particular location which have been dated by the radiocarbon technique, it is possible to calculate the in situ first-order rate constant for interconversion of the L- and D enantiomers of aspartic acid. Once this “calibration” has been calculated, the reaction can be used to date other bones from the deposit that are either too old to be dated by radiocarbon or that are too small for radiocarbon dating. The only assumption required with this approach is that the average temperature experienced by the “calibration” sample is representative of the average temperature experienced by older samples. This “calibration” technique is used herein to date bones from the Olduvai Gorge area in Tanzania, Africa. 1973-05 /pmc/articles/PMC433490/ /pubmed/16592082 Text en
institution US National Library of Medicine
collection PubMed Central
language en
format Article
topic Biological Sciences: Anthropology
spellingShingle Biological Sciences: Anthropology
Bada, Jeffrey L.
Protsch, Reiner
Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
description In the time interval datable by radiocarbon, and at the temperatures of most archeological sites, a substantial amount of racemization of aspartic acid takes place. By determination of the amount of racemization of aspartic acid in bones from a particular location which have been dated by the radiocarbon technique, it is possible to calculate the in situ first-order rate constant for interconversion of the L- and D enantiomers of aspartic acid. Once this “calibration” has been calculated, the reaction can be used to date other bones from the deposit that are either too old to be dated by radiocarbon or that are too small for radiocarbon dating. The only assumption required with this approach is that the average temperature experienced by the “calibration” sample is representative of the average temperature experienced by older samples. This “calibration” technique is used herein to date bones from the Olduvai Gorge area in Tanzania, Africa.
author Bada, Jeffrey L.
Protsch, Reiner
author_facet Bada, Jeffrey L.
Protsch, Reiner
author_sort Bada, Jeffrey L.
title Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
title_short Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
title_full Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
title_fullStr Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
title_full_unstemmed Racemization Reaction of Aspartic Acid and Its Use in Dating Fossil Bones
title_sort racemization reaction of aspartic acid and its use in dating fossil bones
publishDate 1973
url https://ncbi.nlm.nih.gov/pmc/articles/PMC433490/
https://ncbi.nlm.nih.gov/pubmed/16592082
_version_ 1759808187324694528

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