基于胶原蛋白的放射性碳年龄与天冬氨酸消旋年龄的一致性。
Concordance of collagen-based radiocarbon and aspartic-acid racemization ages.
作者信息
Bada J L, Schroeder R A, Protsch R, Berger R
出版信息
Proc Natl Acad Sci U S A. 1974 Mar;71(3):914-7. doi: 10.1073/pnas.71.3.914.
By determining the extent of racemization of aspartic acid in a well-dated bone, it is possible to calculate the in situ first-order rate constant for the interconversion of the L and D enantiomers of aspartic acid. Collagen-based radiocarbon-dated bones are shown to be suitable samples for use in "calibrating" the racemization reaction. Once the aspartic-acid racemization reaction has been "calibrated" for a site, the reaction can be used to date other bones from the deposit. Ages deduced by this method are in good agreement with radiocarbon ages. These results provide evidence that the aspartic-acid racemization reaction is an important chronological tool for dating bones either too old or too small for radiocarbon dating. As an example of the potential application of the technique for dating fossil man, a piece of Rhodesian Man from Broken Hill, Zambia, was analyzed and tentatively assigned an age of about 110,000 years.
通过测定年代确定的骨骼中天冬氨酸的外消旋程度，就有可能计算天冬氨酸L型和D型对映体相互转化的原位一级速率常数。结果表明，基于胶原蛋白的放射性碳测年骨骼是用于“校准”外消旋反应的合适样本。一旦某一地点的天冬氨酸外消旋反应得到“校准”，该反应就可用于测定该沉积物中其他骨骼的年代。用这种方法推断出的年代与放射性碳年代非常吻合。这些结果证明，天冬氨酸外消旋反应是一种重要的年代测定工具，可用于测定因年代太久或体积太小而无法进行放射性碳测年的骨骼。作为该技术在古人类化石年代测定中潜在应用的一个例子，对来自赞比亚布罗肯希尔的一块罗德西亚人头骨进行了分析，并初步确定其年龄约为11万年。
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