TABLE I

Nylon-MXD6–Related Compounds Leached from Black Particles and Observed in the Syringe Solution

	Compound/Structure/Molecular Weight	Concentration in Syringe Solution (ppb)
1	Isophthalamide/164 m/z	175
2	3-Carbamoylbenzoic acid/165 m/z	122^*
3	278 m/z	69^*
4	277 m/z	59^*
5	411 m/z	39^*
6	410 m/z	59^*
7	524 m/z	45^*
8	Cyclic monomer/246 m/z	40^*
9	Cyclic dimer/492 m/z	30^*

↵* Estimated using an isophthalamide calibration curve. Compounds 1–7 are characteristic of photo-oxidation degradation, and compounds 8 and 9 are common cyclic by-products of Nylon-MXD6.