Table 5. The PPG oligomers extracted from each FDA PLA material using IPA.
| Retention Time (min) | PPG Oligomer | Observed mass | Mass error (ppm) | ESI(+) Adducts | Amount (mg/sample) | ||
|---|---|---|---|---|---|---|---|
| Filament | Device | Annealed | |||||
| 6.6 | C15H30O5 | 290.2077 | -3.8 | +H, +K, +Na, +NH4 | 17 | 12 | 11 |
| 7.8 | C18H36O6 | 348.2496 | -3 | +H, +K, +Na, +NH4 | 26 | 17 | 16 |
| 8.7 | C21H42O7 | 406.2915 | -2.4 | +NH4, +H, +K, +Na | 31 | 23 | 21 |
| 9.6 | C24H48O8 | 464.3340 | -0.7 | +NH4, +H, +K, +Na | 38 | 26 | 24 |
| 10.5 | C27H54O9 | 522.3761 | -0.1 | +NH4, +H, +K, +Na | 40 | 27 | 11 |
| 11.3 | C30H60O10 | 580.4179 | -0.3 | +NH4, +H, +K, +Na | 41 | 28 | 26 |
| 12.0 | C33H66O11 | 638.4595 | -0.7 | +NH4, +H, +K, +Na | 39 | 28 | 25 |
| 12.8 | C36H72O12 | 696.5020 | 0.3 | +NH4, +H, +K, +Na | 35 | 26 | 23 |
| 13.5 | C39H78O13 | 754.5432 | -0.6 | +NH4, +H, +K, +Na | 37 | 27 | 23 |
| 14.2 | C42H84O14 | 812.5852 | -0.4 | +NH4, +H, +K, +Na | 31 | 21 | 19 |
| 15.0 | C45H90O15 | 870.6273 | -0.1 | +NH4, +H, +K, +Na | 28 | 19 | 17 |
| 15.7 | C48H96O16 | 928.6691 | -0.1 | +NH4, +H, +K, +Na | 27 | 19 | 15 |
| 16.4 | C51H102O17 | 986.7111 | 0 | +NH4, +H, +K, +Na | 22 | 16 | 12 |
| 17.1 | C54H108O18 | 1044.7538 | 0.8 | +NH4, +H, +K, +Na | 19 | 13 | 10 |
| 17.8 | C57H114O19 | 1102.7959 | 0.9 | +NH4, +H, +K, +Na | 15 | 10 | 7 |
| 18.6 | C60H120O20 | 1160.8368 | 0.1 | +NH4, +H, +K, +Na | 13 | 16 | 11 |
PPG oligomers detected using an LC/QTOF-MS technique.