TABLE II
Nylon-6–Related Compounds Leached from Black Particles and Observed in the Syringe Solution
| Compound/Structure/Molecular Weight | Concentration in Syringe Solution (ppb) | |
|---|---|---|
| 10 |  Caprolactam/113 m/z | <260 |
| 11 |  Caprolactam cyclic dimer/226 m/z | <260 |
| 12 |  Caprolactam cyclic tetramer/452 m/z | <260 |
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* Estimated based on one point calibration. Compound 10 is the starting material, and compounds 11 and 12 are common cyclic by-products of Nylon-6.