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Table 3 Most relevant py-TMAH-GC/MS mass spectrum fragmentation peaks for the materials characterization across the samples

From: A multi-analytical study of historical coated plaster surfaces: the examination of a nineteenth-century V&A cast of a tombstone

RT (min) m/z Assignment
16.25 55, 69, 74, 83, 87, 111, 129(100), 138, 171, 188 Dimethyl phthalate
17.50 74(100), 87, 97, 111, 143, 152, 178, 185 Dimethyl azelate
21.68 74(100), 87, 101, 129, 145, 185, 227, 270 Methyl palmitate
23.60 74(100), 87, 129, 143, 199, 255, 298 Methyl stearate
25.47 187, 207, 253(100), 313, 328 7-Oxodehydroabietic acid, methyl ester
25.57 141, 155, 197, 239(100), 253, 314 Methyl dehydroabietate
30.08 79(100), 121, 138, 160, 189, 205, 442 Betullin