Application to Aztec and Maya Archaeological Samples Paola Lucero
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Chemical analysis of resinous materials employed in artistic pre-hispanic Mexico : application to aztec and maya archaeological samples Paola Lucero To cite this version: Paola Lucero. Chemical analysis of resinous materials employed in artistic pre-hispanic Mexico : application to aztec and maya archaeological samples. Other. Université d’Avignon, 2012. English. NNT : 2012AVIG0244. tel-00959989 HAL Id: tel-00959989 https://tel.archives-ouvertes.fr/tel-00959989 Submitted on 17 Mar 2014 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. ACADEMIE D’AIX-MARSEILLE UNIVERSITE D’AVIGNON ET DES PAYS DE VAUCLUSE Ingénierie Appliquée à la Restauration des Patrimoines Naturel et Culturel UMR IMBE, CNRS 7263-IRD 237 THÈSE Présentée à l’Université d’Avignon et des Pays de Vaucluse Pour obtenir le diplôme de DOCTORAT SPÉCIALITÉ : Chimie ANALYSE CHIMIQUE DES MATIÈRES RÉSINEUSES EMPLOYÉES DANS LE DOMAINE ARTISTIQUE PRÉ- HISPANIQUE AU MEXIQUE. APPLICATION AUX ÉCHANTILLONS ARCHÉOLOGIQUES AZTÈQUE ET MAYA. Présentée par Paola LUCERO En vue de l’obtention du grade de Docteur en Sciences Soutenue le 14 Septembre 2012 Directrice de Thèse : Cathy VIEILLESCAZES Jury REGERT Martine Présidente du Jury Rapporteur, directrice de recherche CNRS, Université Nice Sophia Antipolis BUCIO-GALINDO Lauro Rapporteur, professeur à l’Université National Autonome du Mexique MATHE Carole Co-encadrant de thèse, maître de conférences à l’Université d’Avignon et des Pays de Vaucluse VIEILLESCAZES Catherine Directrice de thèse, professeur, HDR à l’Université d’Avignon et des Pays de Vaucluse To my parents and siblings, to Val Our Sun has hidden And has left us In complete darkness. We know that it will illuminate us again. But while it is in the underworld, We must get together. Hiding everything we love in our hearts. Our advanced study schools, Our houses of sing Our temples, Our ball fields will be destroyed We will abandon the streets, to lock ourselves in our homes. Fathers and mothers, Do not forget to tell your children What life has been like Until today in Anahuac, Do not forget to tell your children That one day the Sun will shine again In Anahuac. Last communicate of Aztec Emperor Cuauhtémoc to his people August 12th 1521 t AKNOWLEDGMENTS u This thesis would not have been possible without the help and advice of many scientists, restorers, and archaeologist. It is my deep wish to thank all these people: First of all, I wish to thank Prof. Dr. Cathy Vieillescazes for giving me the opportunity to work in her group on this exceptional research project. She supported me whenever necessary and made this thesis a great learning experience. My most genuine gratitude is owed to Dr. Carole Mathe I thank her for her guidance. Her support and knowledge in conservation science was very valuable and helpful. Many special thanks go to Prof Dr. Irma Belio and Prof Dr. Lauro Bucio. They contributed considerably to the success of this work with their brilliant ideas, on statistical and mathematical treatment of data. I thank them as well for their active collaboration in the collection of certified samples. I cordially thank them for his friendship and enthusiasm and unconditional support. I am grateful to Dr. Rito Vega, without his precious knowledge in botanic, collection of certified samples would not have been possible. I thank Dr. Leonardo López Luján director of the archaeological project of Templo Mayor, for granting us access to both the archaeological site and the archaeological samples, and for the confidence that he deposed on this scientific work and its results. It was a great experience to talk, with María Barajas and the members of the team of the Conservation Department of Templo Mayor Museum. I really appreciate the discussions with them, because they taught me what the problems in restoration are, and which improvements and knowledge would be helpful. I also wish to thank Dr. Aurora Montúfar, who contributed to this research with samples from the paleo- botanical collection of the INAH. I acknowledge National Mexican Council of Science and Technology (CONACYT) for the Ph D. scholarship that granted me. I acknowledge the Academic body of biomaterials from the Autonomous University of Sinaloa., for their participation in the collection of certified resins. t AKNOWLEDGMENTS u I cordially thank the colleagues from the electronic microscop at the Physiscs Institute from the UNAM fro their collaboration in the analysis of copal samples. Most grateful I am to Niko for his support, patience and for following me in this project. A very special thank goes to all my friends that always support me, I will always remember you. Finally my love and gratitude goes to my family that helped me and guided me all along my studies. t SUMMARY u Summary Summary I List of Figures V List of Tables X Abbreviations XIII PART A INTRODUCTION 1 CHAPTER I GENERAL PRESENTATION OF THE COPALS 4 1.1 General presentation of Mexican copals 5 1.2 Botanical and geographical distribution 6 1.2.1 Botanical sources and collection 6 1.3 Historical Context 9 1.3.1 The Maya civilization 9 1.3.2 Chichén Itzá city 10 1.3.3 Importance of “Sacred Cenote” at Chichén Itzá and their offerings 11 1.4 The Aztec civilization 12 1.4.1 The foundation of Mexico-Tenochtitlán 13 1.4.2 The rise of Aztec empire 13 1.4.3 The importance of “Templo Mayor” site 13 1.4.4 The building stages in Templo Mayor construction 14 1.5 Uses and properties 15 1.5.1 Copal uses in ancient Mexico 15 1.5.2 Contemporary uses and applications of copal 17 1.6 Previous works on chemical composition of Mexican copals 18 1.7 Oleo-gum-resin: definitions 19 1.8 Gums 19 1.9 Gum composition of Bursera simaruba 19 1.10 Fats 20 1.11 Terpenic resins 20 1.12 Bio synthesis of terpenic precursors 20 1.13 The essential oils 21 1.13.1 Triterpens 23 1.13.2 The ursans 24 1.13.3 The oleanans 24 1.13.4 The lupans 25 1.13.5 Biological activity 26 CHAPTER II PRESENTATION OF THE COPAL SAMPLES AND THE ANALYTICAL STRATEGY 28 2.1 Extraction of copal 29 I t SUMMARY u 2.2 Resins from botanical certified origin 31 2.2.1 Botanical References 31 2.2.2 Choice of studied species 32 2.3 Archaeological samples from Templo Mayor site 33 2.3.1 Description of the offerings from Templo Mayor 34 2.3.2 Macroambiental conditions 38 2.3.3 Microambiental conditions 39 2.4 Description of archeological Aztec offerings 40 2.4.1 Offering 120 40 2.4.2 Offering 125 41 2.4.3 Offering 126 42 2.4.4 Offering 128 42 2.5 Archaeological sample from the “Sacred Cenote” of Chichén Itzá 42 2.5.1 Macroambiental conditions 43 2.5.2 The Chichén Itzá Cenote: microambiental conditions 45 2.5.3 Underwater Chichén Itzá cenote explorations 46 2.6 Commercial Samples 48 2.7 Presentation of the Analytical Strategy 51 2.8 Study by optical microscopy 53 2.9 Conclusion 56 PART B Analytical Study of the resins and Discussion 57 CHAPTER III SPECTROSCOPIC TECHNIQUES: FTIR 57 3.1 Mathematical Treatment of Experimental data: chemometric strategies 57 3.1.1 Principal Component Analysis 57 3.1.2 Linear discriminant analysis (LDA) 59 3.2 Chemotaxonomy. Correlation of resin composition and botanical origin 60 3.2.1 Terpenoids and chemotaxonomy 61 3.3 Study by Fourier-transformed infrared spectroscopy (FTIR) 62 3.3.1 FTIR spectra of terpene and terpene like molecules 62 3.4 Sampling Methods: transmission methods 64 3.5 Reflectance Methods 64 3.6 Results and discussion 65 3.7 PCA 67 3.8 Linear discriminant analysis 71 3.9 Application to a botanical origin certified sample 72 3.10 Application to two commercial samples of copal 73 3.11 Deconvolution of the bands in the region between 1200 and 1300 cm -1 of 75 the spectra. Application of the technique to two commercial resins 3.12 Application to archeological resins 78 3.13 Partial analysis of the surface of the samples 80 3.13.1 Comparison of partial analysis from commercial samples and a naturally 81 aged sample of them. II t SUMMARY u 3.13.2 Spectra variation between external and internal part of an archaeological 84 sample TMT 3.14 Conclusions 86 CHAPTER IV HIGH PERFORMANCE LIQUID CHROMATOGRAPHY -UV/VIS ANALYSIS 88 4.1 High Performance Liquid Chromatography (HPLC) 89 4.2 Standard molecules 93 4.3 Quantification of triterpenoids: analytical calibration 93 4.4 Global analysis of certified resin samples 94 4.5 Comparison of global chromatograms from certified origin resins 96 4.6 Comparison of global chromatograms from commercial resins 102 4.7 Comparison of global chromatograms of archaeological resins 105 4.8 HPLC coupled to PCA analysis for botanical certified resins 108 4.9 Linear Discriminant Analysis 111 4.10 HPLC coupled to PCA analysis for archeological resins 112 4.11 Purification by Solid Phase Extraction (SPE) 115 4.12.1 General Methodology 115 4.13 Conclusion 117 CHAPTER V GAS CHROMATOGRAPHY-MASS SPECTROMETRY 118 5.1 Derivatization 120 5.2 The study of standard triterpenoic molecules 121 5.3 Results of the study on botanical certified samples 123 5.4 Comparison of global chromatograms from certified origin resins 124 5.5 Insight on triterpenic composition for samples of certificated origin 128 5.5.1 Comparison between B.