Abstract
Proteins in works of art are generally determined by the relative amounts of amino acids. This method, however, implies a loss of information on the protein structure and its modifications. Consequently, we propose a method based on the analysis of trypsin digests using high-performance liquid chromatography (HPLC) UV diode array detection (DAD) for painting binder studies. All reaction steps are done in the same vial; no extraction methods or sample transfer is needed, reducing the risk of sample losses. A collection of pure binders (collagen, ovalbumin, yolk and casein) as well as homemade and historical paint samples have been investigated with this method. Chromatograms of unknowns at 214 nm and 280 nm are compared with those of the reference samples as a fingerprint. There is a good agreement between many peptides, but others seem to have been lost or their retention time shifted due to small compositional changes because of ageing and degradation of the paint. The results are comparable with the results of other techniques used for binder identification on the same samples, with the additional advantage of differentiation between egg yolk and glair.
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Acknowledgements
This investigation was funded by the Belgian Science Policy as a part of the doctoral research project of Wim Fremout. Support of the Interuniversity Attraction Poles Program—Belgian Science Policy is greatly acknowledged. The authors wish to thank Ing Ina Vanden Berghe and Marie-Christine Maquoi for the amino acid analysis with HPLC and Mathieu Douineau and Marie Poellaer for helping us prepare the homemade samples inspired by ancient recipes.
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Fremout, W., Sanyova, J., Saverwyns, S. et al. Identification of protein binders in works of art by high-performance liquid chromatography–diode array detector analysis of their tryptic digests. Anal Bioanal Chem 393, 1991–1999 (2009). https://doi.org/10.1007/s00216-009-2686-z
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DOI: https://doi.org/10.1007/s00216-009-2686-z