Summary
A procedure for the hydrolysis of proteins, based on catalysis by the protonated form of a strong cation exchanger, was established for proteinaceous binding media (e.g. casein, egg, animal collagene) used for objects of art. The experimental parameters for the hydrolysis (temperature, time) were optimized, as well as the conditions for sorption and desorption of the amino acids on the cation exchanger. The results for the identification of proteins by the gas chromatographic pattern of the amino acid derivatives, after hydrolysis by the ion exchanger and by hydrochloric acid were compared. The former method proved to be more efficient due to the mild conditions, avoiding the formation of humins in the presence of carbohydrates, and reducing the dissolution of pigments. The method was applied to identify the proteinaceous vehicles of samples from priming and paint layers of easel and wall paintings from the 16th and 18th century.
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Kenndler, E., Schmidt-Beiwl, K., Mairinger, F. et al. Identification of proteinaceous binding media of easel paintings by gas chromatography of the amino acid derivatives after catalytic hydrolysis by a protonated cation exchanger. Fresenius J Anal Chem 342, 135–141 (1992). https://doi.org/10.1007/BF00321708
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DOI: https://doi.org/10.1007/BF00321708