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Direct chemolysis–gas chromatography–mass spectrometry for analysis of paint materials

✍ Scribed by Václav Pitthard; Paul Finch; Tatjana Bayerová

Publisher
John Wiley and Sons
Year
2004
Tongue
English
Weight
839 KB
Volume
27
Category
Article
ISSN
1615-9306

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✦ Synopsis

Abstract

A novel direct method using (m‐trifluoromethylphenyl)trimethylammonium hydroxide (TFTMAH) has been developed for on‐line (trans)esterification of lipidic materials (drying oils, egg) prior to GC‐MS analysis. The method was first optimised by comparing three N‐methylammonium hydroxide reagents (TMAH, PhTMAH, TFTMAH) and triolein as a lipid standard. Secondly, the procedure was tested on a series of fresh and naturally aged (up to 40 years) (un)pigmented drying oils and egg yolk reference film standards. Thirdly, the method was applied to the analysis of a sample from an altar painting “Resurrection of Christ” by Francesco Solimena (1723) from the Chapel of Upper Belvedere in Vienna. The relative proportions of the fatty acids from the translucent size layer confirm the presence of partially degraded oil, probably pre‐polymerised walnut oil.

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