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Table 2 Compounds identified by GC/MS in reference and in archaeological birch bark

From: Micromorphological and chemical elucidation of the degradation mechanisms of birch bark archaeological artefacts

Peak no. Compound m/z peak MW
1 suberic acid 303, 259, 217, 187 318
2 vanillic acid 312, 297, 282, 267, 253 312
3 azelaic acid 317, 273, 201 332
4 sebacic acid 331, 287, 215 346
5 cis-ferulic acid 338, 323, 308, 293 338
6 p-coumaric acid 308, 293, 249, 219 308
7 palmitic acid 313, 269, 145, 129, 117 328
8 trans-ferulic acid 338, 323, 308, 293 338
9 linoleic acid 337, 293, 145, 129, 117 352
10 oleic acid 339, 295, 145, 129, 117 354
11 stearic acid 341, 297, 145, 129, 117 356
12 ω-hydroxy-C16 acid 401, 385, 311, 217, 204, 147 416
13 C20 acid 384, 369, 145, 129, 117 384
14 α,ω- C16 dioic acid 415, 299, 217, 204, 147 430
15 ω-hydroxy-C18:1 acid 442, 427, 411, 337, 217, 204, 147 442
16 isomer of ω-hydroxy-C18:1 acid 442, 427, 411, 337, 217, 204, 147 442
17 ω,x-dihydroxy-C16 acid 489, 383, 331, 317, 303, 289, 275 504
18 ω-hydroxy-C18 acid 429, 413, 339, 217, 204, 147 444
19 C22 acid 412, 397, 145, 129, 117 412
20 α,ω- C18:1 dioic acid 456, 441, 366, 276 456
21 α,ω- C18 dioic acid 458, 443, 368, 278 458
22 unidentified 515, 343, 329  
23 9,10-dihydroxy- C18:1 acid 515, 425, 343, 329, 315 530
24 ω-hydroxy-C20:1 acid 470, 455, 439, 365, 217, 204, 147 470
25 9,10-dihydroxy- C18 acid 517, 443,359, 345, 331, 303 532
26 ω-hydroxy-C20 acid 457, 441, 367, 217, 204, 147 472
27 9-methoxy-10,18-dihydroxy- C18 acid* 547, 332, 317, 303 562
28 9,10,18- trihydroxy- C18 acid 605, 471, 390, 317, 303 620
29 9-methoxy-10-hydroxy- C18-1,18-dioic acid* 551,515, 441, 317, 303 576
30 9,10-dihydroxy- C18-1,18-dioic acid 619, 545, 373, 317, 303 634
31 ω-hydroxy-C22 acid 485, 469, 395, 217, 204 500
32 α,ω- C22 dioic acid 499, 383, 217, 204 514
33 friedelin 426, 411, 315, 207, 189 426
34 lupeol 498, 483, 393, 369, 203, 189 498
35 betulone 422, 409, 203, 189 512
36 betulin 596, 496, 483, 393, 203, 189 596
37 betulinic acid 600, 585, 512, 483, 203, 189 600
38 lupenone 424, 409, 313, 245, 205 424
  1. *The epoxy compounds were converted into corresponding methoxyhydrin compounds during hydrolysis in the presence of methanol.
  2. Compounds were identified as TMS ester and ether derivates. Numbers refer to the peak numbers in the chromatograms shown in Figure 4, Figures 6,7,8 and Figure 10.