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Offroy M, Marchetti M, Kauffmann TH, Bourson P, Duponchel L, Savarese L, Mechling JM. Using clustering as pre-processing in the framework of signal unmixing for exhaustive exploration of archaeological artefacts in Raman imaging. Talanta 2024; 274:125955. [PMID: 38552475 DOI: 10.1016/j.talanta.2024.125955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 03/14/2024] [Accepted: 03/18/2024] [Indexed: 05/04/2024]
Abstract
Analytical chemistry on archaeological material is an essential part of modern archaeological investigations and from year to year, instrumental improvement has made it possible to generate data at a high spatial and temporal frequency. In particular, Raman spectral imaging can be successfully applied in archaeological research by its simplicity of implementation to study past human societies through the analysis of their material remains. This technique makes it possible to simultaneously obtain spatial and spectral information by preserving sample integrity. However, because of the inherent complexity of the samples in Archaeology (e.g. seniority, fragility, lack or full absence of any information about its composition), chemical interpretation can be difficult at first glance. Indeed, specific problems of spectral selectivity related to unexpected chemical compounds could appear due to their state of conservation. Furthermore, detecting minor compounds becomes challenging as major components impose their contributions in the acquired spectra. Therefore, a relevant chemometric approach has been introduced in this context to characterize distinct spectral sources in a Raman imaging dataset of an archaeological specimen - a mosaic fragment. The fragment was unearthed during the Ruscino archaeological dig on the outskirts of Perpignan, France. It dates back to the oppidum period. The aim is to extract selective spectral information from pixel clustering analysis in order to enhance the initial optimisation step within the Multivariate Curve Resolution and Alternating Least-Squares (MCR-ALS) algorithm, a well-known signal unmixing technique. The underlying principle of the MCR-ALS is that the acquired spectra can be expressed as linear combinations of pure spectra of all individual components present in the chemical system under study. Sometimes it can be difficult to obtain the desired results through the algorithm, particularly if initial estimates of spectral or concentration profiles are inaccurate due to complex signals, noise or lack of selectivity, resulting in rank deficiency (i.e. a poor estimation of the total number of pure signals). For this reason, an innovative threshold-based clustering algorithm, combined with multiple Orthogonal Projection Approaches (OPA), has been developed to improve matrix rank investigation and thus the initialisation step of the MCR-ALS approach before optimisation. The effective analysis of Raman imaging data for an archaeological mosaic played a crucial role in uncovering significant chemical information about a particular biogenic material. This insight sheds light on the origins of mortar manufacture during the oppidum period.
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Affiliation(s)
- Marc Offroy
- Université de Lorraine, CNRS, LIEC, F-54000, Nancy, France.
| | - Mario Marchetti
- Université Gustave Eiffel, MAST, FM2D, IFSTTAR, 14-20 Boulevard Newton, Cité Descartes, Champs sur Marne, F-77447, Marne La Vallée Cedex 2, France; Université de Lorraine, CNRS, IJL, F-54000, Nancy, France
| | | | - Patrice Bourson
- Université de Lorraine, CentraleSupelec, LMOPS, F-57000, Metz, France
| | | | - Laurent Savarese
- Centre de Recherches Archéologiques de Ruscino, Ville de Perpignan, Chercheur Associé UMR 5140 TESAM, France
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In situ simultaneous quantitative analysis multi-elements of archaeological ceramics via laser-induced breakdown spectroscopy combined with machine learning strategy. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107928] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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3
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Ezabadi A, Salami M. Design and characterization of [(Et)3 N-H]FeCl4 as a nanomagnetic ionic liquid catalyst for the synthesis of xanthene derivatives under solvent-free conditions. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-021-04637-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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A novel route for identifying starch diagenetic products in the archaeological record. PLoS One 2021; 16:e0258779. [PMID: 34793489 PMCID: PMC8601532 DOI: 10.1371/journal.pone.0258779] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 10/05/2021] [Indexed: 11/20/2022] Open
Abstract
This work introduces a novel analytical chemistry method potentially applicable to the study of archaeological starch residues. The investigation involved the laboratory synthesis of model Maillard reaction mixtures and their analysis through Fourier-Transform Ion Cyclotron Resonance Mass Spectrometry (FTICR-MS). Thus, starch from sixteen plant species were matured while reacting it with the amino acid glycine. The FTICR-MS analysis revealed > 5,300 molecular compounds, with numerous unique heteroatom rich compound classes, ranging from 20 (Zea mays) to 50 (Sorghum bicolor). These classes were investigated as repositories of chemical structure retaining source and process-specific character, linked back to botanical provenance. We discussed the Maillard reaction products thus generated, a possible pathway for the preservation of degraded starch, while also assessing diagenetic recalcitrance and adsorption potential to mineral surfaces. In some cases, hydrothermal experimentation on starches without glycine reveals that the chemical complexity of the starch itself is sufficient to produce some Maillard reaction products. The article concludes that FTICR-MS offers a new analytical window to characterize starchy residue and its diagenetic products, and is able to recognize taxonomic signals with the potential to persist in fossil contexts.
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Ruan F, Hou L, Zhang T, Li H. A novel hybrid filter/wrapper method for feature selection in archaeological ceramics classification by laser-induced breakdown spectroscopy. Analyst 2021; 146:1023-1031. [PMID: 33300506 DOI: 10.1039/d0an02045a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Laser-induced breakdown spectroscopy (LIBS) has been appreciated as a valuable analytical tool in the cultural heritage field owing to its unique technological superiority, particularly in combination with chemometric methods. Feature selection (FS) as an indispensable pre-processing step in data optimization, for eliminating the redundant or irrelevant features from high-dimensional data to enhance the predictive capacity and result comprehensibility of multivariate classification based on LIBS technology. In this paper, a novel hybrid filter/wrapper method based on the MI-DBS algorithm was proposed to enhance the qualitative analysis performance of the LIBS technique. The proposed method combines the advantages of the mutual information (MI) algorithm based filter method and bi-directional selection (DBS) algorithm based wrapper method. The MI algorithm is the first to remove the redundant or uncorrelated features so that a simplified input subset can be established. Then, the DBS algorithm is used to further select the retained features and hence to seek an optimal feature subset with good predictive performance. To benefit the above feature selection process, the wavelet transform denoising (WTD) method was used to reduce the noise from LIBS spectra. LIBS experiments were performed using 35 archaeological ceramic samples. Besides, the proposed hybrid filter/wrapper method was implemented through a random forest (RF) based nonlinear multivariate classification method. Through a comparison between several other feature selection methods and the proposed method, it has been seen that the proposed method is the best regarding the predictive performance and number of the selected features. Finally, the MI-DBS algorithm is used to seek the optimal features from the full spectrum (220-720 nm); the corresponding sensitivity, specificity and accuracy acquired through the RF classifier for the test set were 0.9722, 0.9956 and 0.9850. It is shown from the general results that the MI-DBS algorithm is more effective in terms of improving the model performance and decreasing the redundant or uncorrelated features and computational time and serves as a good alternative for FS in multivariate classification.
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Affiliation(s)
- Fangqi Ruan
- Key Laboratory of Synthetic and Natural Functional Molecular Chemistry of Ministry of Education, College of Chemistry & Material Science, Northwest University, Xi'an, China.
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Zilberstein G, Zilberstein S, Maor U, Righetti PG. Surface analysis of ancient parchments via the EVA film: The Aleppo Codex. Anal Biochem 2020; 604:113824. [DOI: 10.1016/j.ab.2020.113824] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 06/07/2020] [Accepted: 06/08/2020] [Indexed: 11/26/2022]
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7
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Zilberstein G, Zilberstein S, Maor U, Baskin E, D'Amato A, Righetti PG. De re metallica. Johannes Kepler and alchemy. Talanta 2019; 204:82-88. [DOI: 10.1016/j.talanta.2019.05.094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/21/2019] [Accepted: 05/22/2019] [Indexed: 01/18/2023]
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Abstract
Shellfish purple, also known as Tyrian purple and royal purple, has a long history, which has been revealed and documented in recent years through valid physicochemical studies using sophisticated techniques. The aim of the work was to summarize the conclusions of these studies and to describe the results of two unpublished investigations regarding the (i) identification of shellfish purple in a textile (4th century BCE) from ancient Macedonia and (ii) dramatic effect of the dyeing conditions on the composition of the purple dye. Moreover, a critical discussion is included about the discovery of the shellfish pigment and dye based on the available scientific evidence. Previously published reports describing the identification of the shellfish colorant in objects of the cultural heritage were carefully summarized. Shellfish purple was not used only as colorant, but it served other purposes as emphasized in this review. In particular, examples for the use of shellfish purple in medicine, grave goods and fillers and plasters in walls, were described. Examples of materials and methods that were used in the past to produce “fake” purple, imitating the aesthetic result of the valuable royal marine material were summarized. Finally, the solubility of indigoids was discussed using modern approaches of physical chemistry.
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Il n'y a pas d'amour heureux
pour Casanova: Chemical‐ and bio‐analysis of his
Memoirs. Electrophoresis 2019; 40:3050-3056. [DOI: 10.1002/elps.201800505] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 03/25/2019] [Accepted: 03/29/2019] [Indexed: 01/30/2023]
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Perrault KA, Dubois LM, Cnuts D, Rots V, Focant JF, Stefanuto PH. Characterization of hafting adhesives using comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry. SEPARATION SCIENCE PLUS 2018. [DOI: 10.1002/sscp.201800111] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Katelynn A. Perrault
- Organic and Biological Analytical Chemistry Group; University of Liège; Liège Belgium
- Forensic Sciences Unit; Chaminade University of Honolulu; Honolulu HI USA
| | - Lena M. Dubois
- Organic and Biological Analytical Chemistry Group; University of Liège; Liège Belgium
| | - Dries Cnuts
- TraceoLab / Prehistory - University of Liège; Liège Belgium
| | - Veerle Rots
- TraceoLab / Prehistory - University of Liège; Liège Belgium
| | - Jean-François Focant
- Organic and Biological Analytical Chemistry Group; University of Liège; Liège Belgium
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Manfredi M, Barberis E, Gosetti F, Conte E, Gatti G, Mattu C, Robotti E, Zilberstein G, Koman I, Zilberstein S, Marengo E, Righetti PG. Method for Noninvasive Analysis of Proteins and Small Molecules from Ancient Objects. Anal Chem 2017; 89:3310-3317. [DOI: 10.1021/acs.analchem.6b03722] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcello Manfredi
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
- ISALIT, Via G. Bovio 6, 28100, Novara, Novara, Italy
| | - Elettra Barberis
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
- ISALIT, Via G. Bovio 6, 28100, Novara, Novara, Italy
| | - Fabio Gosetti
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
| | | | - Giorgio Gatti
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
| | - Clara Mattu
- Politecnico di Torino - sede di Alessandria, Viale T. Michel, 5 15121 Alessandria, Italy
| | - Elisa Robotti
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
| | | | - Igor Koman
- Translational
Medicine Institute, Ariel University, Ariel, 40700 Israel
| | | | - Emilio Marengo
- Dipartimento
di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale, Viale Teresa Michel 11, 15121, Alessandria, Italy
| | - Pier Giorgio Righetti
- Department
of Chemistry, Materials and Chemical Engineering “‘Giulio Natta”’, Politecnico di Milano, Via Mancinelli 7, Milano 20131, Italy
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Wang N, He L, Zhao X, Simon S. Comparative analysis of eastern and western drying-oil binding media used in polychromic artworks by pyrolysis–gas chromatography/mass spectrometry under the influence of pigments. Microchem J 2015. [DOI: 10.1016/j.microc.2015.06.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Bianco G, Granafei S, Colivicchi F, Catald T, Buchicchio A. Ancient pottery from archaeological sites in Southern Italy: first evidence of red grape products markers. EUROPEAN JOURNAL OF MASS SPECTROMETRY (CHICHESTER, ENGLAND) 2015; 21:693-699. [PMID: 26353991 DOI: 10.1255/ejms.1377] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The chemical analysis of tartaric acid (TA) and syringic acid (SA), as grape product markers in ancient ceramic vessels from the sites of Manduria and Torre di Satriano (southern Italy), was successfully performed. Firstly, the fragmentation behaviour of TA and SA as deprotonated molecules, [M-H](-), obtained by collision-induced dissociation, was investigated. Then, reversed-phase liquid chromatography (RPLC) with electrospray ionization (ESI) in negative ion mode, using a quadrupole linear ion trap in multiple reaction monitoring (MRM), was employed. A binary mobile phase composed of water-acetonitrile with 0.1% (v/v) acetic acid enabled the optimum ESI efficiency of SA, greatly improving its identification when it occurs in trace amounts. Chemical analysis of ancient pottery fragments is a valid method for establishing the existence of preserved organic residues, which is valuable new evidence for the culture and customs of ancient populations, in this case those of southern Italy. The proposed RPLC-ESI-MRM method allowed a systematic investigation of ceramic fragments of both archaeological sites, thus providing positive evidence for the presence of TA and SA as grape product markers in storage vessels dating back to the ninth to third centuries BC.
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Affiliation(s)
- Giuliana Bianco
- Dipartimento di Scienze, Università degli Studi della Basilicata, Via dell'Ateneo Lucano 10, 85100 Potenza, Italy.
| | - Sara Granafei
- Dipartimento di Chimica & Centro Interdipartimentale SMART, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, 70126 Bari, Italy.
| | - Fabio Colivicchi
- Classics Department, Queen's University, 502 Watson Hall, 49 Bader Lane, Kingston, Ontario, Canada K7L 3N6.
| | - Tommaso Catald
- Dipartimento di Chimica & Centro Interdipartimentale SMART, Università degli Studi di Bari Aldo Moro, Campus Universitario, Via E. Orabona 4, 70126 Bari, Italy.
| | - Alessandro Buchicchio
- Scuola di Ingegneria, Università degli Studi della Basilicata, Via dell' Ateneo Lucano 10, 85100 Potenza, Italy.
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