Abstract
The characterization of the organic components in a complex, multilayered paint structure is fundamental for studying painting techniques and for authentication and restoration purposes. Proteinaceous materials, such as animal glue, are of particular importance since they are widely used as binders, adhesives and for gilding. Even though proteins are usually detected by chromatographic and proteomic techniques, immunological methods represent an alternative powerful approach to protein analysis thanks to the high specificity of antigen–antibody reactions. Our previous studies demonstrated that ovalbumin and casein could be localized in paint cross-sections with high sensitivity and good spatial resolution (i.e. within the single painting layers) by using chemiluminescent (CL) immunochemical microscope imaging. In the present research work, we describe for the first time the immunolocalization of collagen (the main protein of animal glue) in paint cross-sections by CL imaging microscopy. Two different analytical protocols have been developed, allowing either the detection of collagen or the simultaneous detection of collagen and ovalbumin in the same paint sample. The assays were used to detect collagen and ovalbumin in cross-sections from model samples and historical paintings (a wall painting dated to 1773–1774 and a painted wood panel of the Renaissance period) in order to achieve information on paint techniques and past restoration interventions.
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Acknowledgments
This work was supported by the Italian Ministry of Instruction, University and Research (PRIN 2008 project “Sviluppo di metodologie diagnostiche integrate per la caratterizzazione e la localizzazione stratigrafica della componente organica in manufatti policromi artistici ed archeologici”, prot. 2008ZRSHHB) and by the EU (7° FP project “CHARISMA–Cultural Heritage Advanced Research Infrastructures: Synergy for a Multidisciplinary Approach to Conservation/Restoration”, no. 228330).
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Published in the special issue Analytical Science in Italy with guest editor Aldo Roda.
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Sciutto, G., Dolci, L.S., Guardigli, M. et al. Single and multiplexed immunoassays for the chemiluminescent imaging detection of animal glues in historical paint cross-sections. Anal Bioanal Chem 405, 933–940 (2013). https://doi.org/10.1007/s00216-012-6463-z
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DOI: https://doi.org/10.1007/s00216-012-6463-z