Zinc isotope variations in archeological human teeth (Lapa do Santo, Brazil) reveal dietary transitions in childhood and no contamination from gloves
In: ISSN: 1932-6203, 2020
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International audience ; Zinc (Zn) isotope ratios of dental enamel are a promising tracer for dietary reconstruction in archeology, but its use is still in its infancy. A recent study demonstrated a high risk of Zn contamination from nitrile, and latex gloves used during chemical sample preparation. Here we assess the potential impact of the use of such gloves during enamel sampling on the Zn isotope composition of teeth from a population of early Holocene hunter gatherers from Lapa do Santo, Lagoa Santa, Minas Gerais, Brazil. We first examined the amount of Zn and its isotopic composition released from the gloves used in this study by soaking them in weak nitric acid and water. We compared Zn isotope ratios obtained from teeth that were sampled wearing nitrile, latex or no gloves. Finally, we performed a linear mixed model (LMM) to investigate post hoc the relationship between the gloves used for sampling and the Zn isotope variability in dental enamel. We found that the gloves used in this study released a similar amount of Zn compared to previous work, but only in acidic solution. Zn isotope ratios of teeth and the LMM identified no sign of significant Zn coming from the gloves when teeth were handled for enamel sampling. We hypothesize that Zn in gloves is mostly released by contact with acids. We found that the main source of Zn isotope variability in the Lapa do Santo population was related to the developmental stage of the tooth tissues sampled. We report identical results for two individuals coming from a different archeological context. Tooth enamel formed in utero and/or during the two first years of life showed higher Zn isotope ratios than enamel formed after weaning. More work is required to systematically investigate if Zn isotopes can be used as a breastfeeding tracer.
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Zinc isotope variations in archeological human teeth (Lapa do Santo, Brazil) reveal dietary transitions in childhood and no contamination from gloves
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Autor/in / Beteiligte Person: | Jaouen, Klervia ; Trost, Manuel ; Bourgon, Nicolas ; Colleter, Rozenn ; Le Cabec, Adeline ; Tütken, Thomas ; Elias Oliveira, Rodrigo ; Pons, Marie-Laure ; Méjean, Pauline ; Steinbrenner, Sven ; Chmeleff, Jérôme ; Strauss, André ; Géosciences Environnement Toulouse (GET) ; Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) ; Max Planck Institute for Evolutionary Anthropology Leipzig ; Max-Planck-Gesellschaft ; Johannes Gutenberg - Universität Mainz = Johannes Gutenberg University (JGU) ; Institut national de recherches archéologiques préventives (Inrap) ; Anthropologie Moléculaire et Imagerie de Synthèse (AMIS) ; Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS) ; De la Préhistoire à l'Actuel : Culture, Environnement et Anthropologie (PACEA) ; Université de Bordeaux (UB)-Centre National de la Recherche Scientifique (CNRS) ; Universidade de São Paulo = University of São Paulo (USP) ; Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ; Max Planck SocietyFoundation CELLEXFundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)04/01321-608/51747-017/16451-2Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPQ)435980/2018-1German Research Foundation (DFG)378496604MSCA753059ERC ARCHEIS803676 |
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Zeitschrift: | ISSN: 1932-6203, 2020 |
Veröffentlichung: | HAL CCSD ; Public Library of Science, 2020 |
Medientyp: | academicJournal |
DOI: | 10.1371/journal.pone.0232379 |
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