Geochemical evolution of pleistocene bears dentine amino acids

Torres Pérez-Hidalgo, Trinidad José and Ortiz Menéndez, José Eugenio and Llamas Borrajo, Juan F. and Canoira López, Laureano and García García, María Jesús (2001). Geochemical evolution of pleistocene bears dentine amino acids. "Chirality", v. 13 (n. 8); pp. 517-521. ISSN 1520-636X.

Description

Title: Geochemical evolution of pleistocene bears dentine amino acids
Author/s:
  • Torres Pérez-Hidalgo, Trinidad José
  • Ortiz Menéndez, José Eugenio
  • Llamas Borrajo, Juan F.
  • Canoira López, Laureano
  • García García, María Jesús
Item Type: Article
Título de Revista/Publicación: Chirality
Date: 2001
ISSN: 1520-636X
Volume: 13
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería Geológica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A linear correlation was established between aspartic acid racemization ratio from cave bear dentine collagen and absolute dating. The high correlation coefficient obtained allowed age calculation through amino acid racemization. Aspartic acid and glutamic acid racemization kinetics have also been explored in dentine from a North American black bear (Ursus americanus Pallas). Three sample sets were prepared for kinetic heating experiments in nitrogen atmosphere: one water soaked, one with a water-saturated nitrogen atmosphere, and one without any moisture. It was possible to show that the presence of water is a factor controlling amino acid racemization rate. The aspartic acid in a heating experiment at 105° C shows an "apparent kinetics reversal" which can be explained by a progressive hydrolysis of amino acid chains (proteins and polypeptides). Because of t h e low potential of collagen preservation over long periods of time, the apparent kinetics reversal phenomenon will not affect the dating of old material where no traces of collagen remain. An apparent kinetics reversal was not observed in glutamic acid, which racemizates more slowly

More information

Item ID: 4018
DC Identifier: http://oa.upm.es/4018/
OAI Identifier: oai:oa.upm.es:4018
Official URL: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1520-636X
Deposited by: Biblioteca ETSI Minas y Energía
Deposited on: 30 Aug 2010 06:57
Last Modified: 20 Apr 2016 13:24
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