化石中氨基酸的成岩作用

Diagenesis of Amino Acids in Fossil Bones and Teeth

分析了两广地区一些第四纪骨和牙化石的氨基酸含量、外消旋程度，探讨了化石中氨基酸的成岩变化特征，阐述了化石中残留蛋白的降解导致氨基酸外消旋速度的变化。

The content and racemization degrees of amino acids in fossil bones and teeth buried in some Quaternary deposits in Guangdong province and the Guangxi Zhuang Autonomous Region, and in Nanyue King′s mausoleum, were analyzed. The results show that proteins in fossils had been gradually degraded into free amino acids and shorter peptides with the increase of burial time, and the amino acid compositions also had been modified. Amino acids in fossils had continuously racemized since buried. Free, terminal and interion amino acids have different racemization rates, which explained why amino acid in various dialysis fractions had different racemization degrees. It can also be expected that amino acids racemization will deviate linear kinetics with the further hydrolysis of residual proteins in fossils.