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Removing contaminants: a restatement of the value of isolating single compounds for AMS dating

Higham, Thomas F.G

Antiquity, 2019-08, Vol.93 (370), p.1072-1075 [Periódico revisado por pares]

Cambridge: Cambridge University Press

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  • Título:
    Removing contaminants: a restatement of the value of isolating single compounds for AMS dating
  • Autor: Higham, Thomas F.G
  • Assuntos: Age ; Alternative approaches ; Amino acids ; Analysis ; Archaeological dating ; Archaeology ; Bones ; Carbon dating ; Chemistry ; Collagen ; Historic artifacts ; Historical analysis ; Human remains ; Influence ; Kuzmin, Yaroslav ; Laboratories ; Methods ; Paleolithic period ; Polymer crosslinking ; Radiocarbon dating ; Radiometric dating ; Reliability ; Scientific imaging
  • É parte de: Antiquity, 2019-08, Vol.93 (370), p.1072-1075
  • Descrição: Kuzmin (2019) uses the results of radiocarbon dating of Palaeolithic human remains from western Russia to raise questions about the reliability of dates based on ultrafiltration and single amino acids. He fails, however, to understand the chemistry underpinning and supporting the reliability of isolating hydroxyproline (Hyp) for AMS dating of bone. His suggested alternative approach, the dating of bulk collagen, can sometimes provide reliable ages, but at other times it does not. Simply because bulk methods work in one instance does not mean that they will work in all cases. This is because site-based contaminants can sometimes chemically cross-link with collagen molecules post-depositionally, and these bonds can be very difficult to break with routine bulk chemistry methods. These bonds can be broken, however, with acid hydrolysis, splitting the collagen molecules into single amino acids and then, by applying semi-preparative-HPLC (high-performance liquid chromatography) methods, separating the amino acids from one another and, therefore, from contaminating sources of carbon. This method is able to isolate contaminant-free single compounds for AMS dating. In the Oxford laboratory, we have focused on Hyp, which elutes between 15.5 and 17.5 minutes on our HPLC system, and provides 12.9 per cent of the total collagen amino acid carbon (Devièse et al. 2018a). We have shown that our method can separate Hyp without adding significant modern or background carbon from laboratory sources.
  • Editor: Cambridge: Cambridge University Press
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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