Identification by GC-FID and GC-MS of amino acids, fatty and bile acids in binding media used in works of art

• Published in: Analytical and bioanalytical chemistry 2001-04, Vol.369 (7-8), p.642-646
• Main Authors: MATEO-CASTRO, R, GIMENO-ADELANTADO, J. V, BOSCH-REIG, F, DOMENECH-CARBO, A, CASAS-CATALAN, M. J, OSETE-CORTINA, L, DE LA CRUZ-CANIZARES, J, DOMENECH-CARBO, M. T
• Format: Article
• Language: English
• Subjects: Amino acids; Amino Acids - analysis; Applied sciences; Bile acids; Bile Acids and Salts - analysis; Chemical properties; Chromatography, Gas - methods; Coatings. Paints, varnishes and inks; Exact sciences and technology; Fatty Acids - analysis; Fatty Acids, Nonesterified - analysis; Film formation and curing, properties, testing; Gas Chromatography-Mass Spectrometry - methods; Plant Oils - chemistry; Polymer industry, paints, wood; Proteins; Saturated fatty acids
• ISSN: 0937-0633; 1618-2642; 1432-1130
• DOI: 10.1007/s002160100737

GC-FID was used as single methodology for the identification and differentiation of proteins, lipids and ox bile from binders used in artistic paintings. The samples were hydrolyzed by HCl. Subsequently, the simultaneous formation of volatile derivatives of the amino, fatty and bile acids with ethyl chloroformate was performed quickly and safely in an aqueous medium. The derivatives were separated by capillary GC and characterized by GC-MS. The ageing of drying oils was studied, identifying pelargonic acid among other degradation products. Proteinaceous and lipoid binding media were characterized by means of the quotients between the areas of the peaks for each amino or fatty acid with respect to the area of the peak for alanine or palmitic acid. Fatty acids from ox bile were easily identified by their retention times characteristic for eicosanoic, docosanoic and pentadecanoic acids. The suggested method was applied to the analysis of binders in baroque paintings by Palomino in Valencia (Spain). Animal gelatine and linseed oil were found.