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Table 4 Tandem-mass spectrometry (MS) analysis of selected 28-carbon containing masses

From: Reduced levels of hydroxylated, polyunsaturated ultra long-chain fatty acids in the serum of colorectal cancer patients: implications for early screening and detection

Marker nominal neutral mass 446 448 450 464 466 468
[M-H]-(%) 445 (100%) 447 (52%) 449 (92%) 463 (70%) 465 (100%) 467 (100%)
Chain cut ions (%) 223 (18%) 277 (11%) 171 (7%) 277 (10%) 241 (7%) 187 (12%)
   222 (11%) 239 (5%) 127 (9%) 241 (68%) 223 (3%) 169 (3%)
   207 (3%) 207 (3%) 125 (12%) 223 (15%) 215 (2%) 141 (2%)
   205 (11%) 169 (6%) 113 (38%) 185 (8%) 185 (4%) 113 (4%)
   113 (5%) 113 (25%)   167 (4%) 167 (4%)  
      113 (28%) 113 (7%)  
Peripheral cut ions (%) Loss of H 2 O 427 (50%) 429 (35%) 431 (80%) 445 (46%) 447 (45%) 449 (84%)
  Loss of 2H 2 O 409 (8%) 411 (6%) 413 (13%) 427 (6%) 429 (8%) 431 (10%)
  Loss of CO 2 401 (95%) 403 (100%) 405 (100%) 419 (100%) 421 (45%) 423 (25%)
  Loss of CO 2 and H 2 O 383 (28%) 385 (15%) 387 (32%) 401 (24%) 403 (20%) 405 (13%)
  *Loss of CO 2 and 2H 2 O 365 367 369 383 (2%) 385 (4%) 387 (3%)
  *Loss of 3H 2 O     409 411 413
Secondary daughter ions (%) 357 (5%) 331 (3%) 307 (5%) 347 (5%) 349 (4%) 349 (1%)
   329 (11%) 305 (3%) 291 (7%) 319 (5%) 321 (2%) 323 (2%)
   261 (3%) 359 (2%) 295 (5%) 295 (6%) 297 (3%) 309 (2%)
   241 (3%) 289 (3%) 281 (5%) 281 (5%) 281 (3%) 297 (6%)
   233 (5%) 245 (3%) 279 (9%) 279 (5%) 279 (15%) 281 (3%)
   207 (11%) 125 (6%) 263 (7%) 267 (5%) 261 (3%) 279 (5%)
   177 (11%) 123 (3%) 261 (5%) 249 (6%) 251 (3%) 269 (5%)
   123 (5%) 121 (3%) 169 (5%) 195 (10%) 195 (2%) 263 (8%)
   109 (11%) 111 (5%) 111 (5%) 141 (1%) 141 (2%) 251 (4%)
   97 (16%) 97 (5%) 97 (8%) 127 (9%) 123 (4%) 243 (2%)
   83 (11%) 59 (3%) 83 (5%) 121 (6%) 113 (5%) 215 (4%)
   59 (11%)   59 (1%) 101 (6%) 101 (3%) 213 (3%)
      97 (4%) 97 (32%) 197 (3%)
      83 (2%) 83 (2%) 125 (4%)
      59 (2%) 59 (2%) 111 (3%)
        98 (2%)
        57 (1%)
  1. *Ions m ay have been obtained from MS3 experiments
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