title: Model study of modern oil-based paint media by triacylglycerol profiling in positive and negative ionization modes.
abstract: Lipid binders have traditionally been determined in paintings by using gas chromatography/mass spectrometry (GC/MS) to identify the characteristic profiles and ratios of fatty acids . However, the presence of mixtures in contemporary and modern oil paints makes the GC/MS determination of fatty acids insufficient to fully characterize the lipid binding media. In this study we prove that triacylglycerol (TAG) profiling by high-performance liquid chromatography with high-resolution tandem mass spectrometry, using ESI in positive and negative ionization modes is highly effective. We exploited this analytical approach to study the curing and degradation processes undergone by six plant oils used in the formulation of media in modern paints, using both natural and artificial ageing experiments. We believe that is the first time that a negative ionization mode has been applied for this purpose and that a survey with HPLC-ESI-Q-ToF has been carried out to study the ageing kinetics of plant oils. TAG profiling enabled us to study the evolution over time of the constituents of modern oils, with respect to curing and ageing. The data analyzed in this study demonstrate that our approach is efficient to study the oxidation of TAGs during ageing. The data also improve current knowledge on the properties of vegetable oils, which could lead to the development of new paint materials and conservation treatments for modern and contemporary works of art.
authors: University of Pisa, Department of Chemistry and Industrial Chemistry, Via G. Moruzzi, 13, I-56124 Pisa, Italy. Electronic address: ilaria.degano@unipi.it.
authors: Ilaria
authors: I
authors: Degano
authors: University of Pisa, Department of Chemistry and Industrial Chemistry, Via G. Moruzzi, 13, I-56124 Pisa, Italy.
authors: Jacopo
authors: J
authors: La Nasa
authors: University of Pisa, Department of Chemistry and Industrial Chemistry, Via G. Moruzzi, 13, I-56124 Pisa, Italy.
authors: Elisa
authors: E
authors: Ghelardi
authors: University of Pisa, Department of Chemistry and Industrial Chemistry, Via G. Moruzzi, 13, I-56124 Pisa, Italy.
authors: Francesca
authors: F
authors: Modugno
authors: University of Pisa, Department of Chemistry and Industrial Chemistry, Via G. Moruzzi, 13, I-56124 Pisa, Italy; Institute for the Conservation and Promotion of Cultural Heritage, National Research Council of Italy, Via Madonna del Piano, 10, I-50019 Sesto Fiorentino, Italy.
authors: Maria Perla
authors: MP
authors: Colombini
mesh_terms: D002851:Chromatography, High Pressure Liquid; D005227:Fatty Acids / Q000032:analysis; D008027:Light; D010150:Paint / Q000032:analysis*; D010938:Plant Oils / Q000032:analysis* / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry; D013696:Temperature; D014025:Titanium / Q000737:chemistry; D014280:Triglycerides / Q000032:analysis* / Q000737:chemistry
chemical_list: D005227:Fatty Acids; D010938:Plant Oils; D014280:Triglycerides; C009495:titanium dioxide; D014025:Titanium
keywords: Aged oils; Gas chromatography/mass spectrometry; High performance liquid chromatography-electrospray ionization-quadrupole-time of flight mass spectrometry; Modern oil identification; Oxidized TAGs; TAG profiling