Surface-enhanced Raman spectroscopy for madder lake detection in painting layers

Anno: 2023

Autori: Innocenti S; Ricci M; Balbas DQ; Fontana R; Striova J; Becucci M

Affiliazione autori: CNR INO Natl Res Council, Natl Inst Opt, Largo E Fermi 6, I-50125 Florence, Italy; Univ Florence, Dept Chem Ugo Schiff, Via Lastruccia 3-13, I-50019 Florence, Italy.

Abstract: Madder lake is the most utilized anthraquinone dyestuff in artworks. Its main constituents (alizarin and purpurin, together with other natural dyes) form an organometallic complex (the lake) insoluble in water by precipitation or adsorption of the dye onto an inorganic substrate. Raman spectra of madder lake are strongly affected by fluorescence, making its identification by Raman spectroscopy difficult or impossible. In this work, we prepared different lakes according to historical recipes and characterized them with X-ray diffraction (XRD), IR, and UV-Visible spectroscopies. Additionally, painting mock-ups were prepared and the lakes were extracted with hydrated and ethanol-rich agar gel beads. This work is aimed at showing the advantages and limits for the identification of the madder lake constituents by Raman and SERS (Surface-Enhanced Raman Spectroscopy) methods in the hydrogels used for sample micro-extraction. The main advantage of SERS for madder lake detection is to allow the user to acquire spectra in random spots in the gel bead, without the need for recrystallized grain localization in the dried hydrogel.

Giornale/Rivista: EUROPEAN PHYSICAL JOURNAL PLUS

Volume: 138 (5)      Da Pagina: 381-1  A: 381-10

Maggiori informazioni: The work was performed within the project on Advanced Raman spectroscopy, Joint Advanced Education Project, co-financed by the Tuscany Region with the resources of the POR FSE 2014-2020-Axis A Employment, Giovanisi as part of the Intervention program called CNR4C. We acknowledge financial support from the H2020-INFRAIA-2019-1 IPERION HS project (G.A. n. 871034)
Parole chiavi: Works-of-art; Anthraquinone Dyes; Organic Colorants; Cultural-heritage; Sample Treatment; Metal Complexes; Alizarin; Sers; Pigments; Identification
DOI: 10.1140/epjp/s13360-023-03964-9

Citazioni: 2
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2025-01-12
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