. 2020 Nov 26;413(4):1091–1098. doi: 10.1007/s00216-020-03071-z

Table 2.

MS parameters for the MRM transitions

Compound	Formula	Molecular weight (g mol⁻¹)	Retention time (min)	Precursor ion	Product ion	Fragmentor voltage (V)	Collision energy (V)
ε-Caprolactam	C₆H₁₁NO	113.16	2.5	114.1	44.0*	290	24
					79.0	290	69
					69.1	290	12
Cyclic dimer	C₁₂H₂₂N₂O₂	226.32	3.5	227.2	96.1*	250	20
					69.0	250	28
					41.0	250	40
Cyclic trimer	C₁₈H₃₃N₃O₃	339.48	4.6	340.3	322.2*	138	12
					96.1	138	32
					209.1	138	24
Cyclic tetramer	C₂₄H₄₄N₄O₄	452.64	7.2	453.4	435.4*	84	20
					209.2	84	36
					322.2	84	28
Cyclic pentamer	C₃₀H₅₅N₅O₅	565.80	8.6	566.4	548.4*	198	24
					209.2	198	48
					322.2	198	36
Cyclic hexamer	C₃₆H₆₆N₆O₆	678.96	9.1	679.5	661.3*	254	28
Cyclic hexamer	C₃₆H₆₆N₆O₆	678.96	9.1	679.5	209.2	254	48

*Used as quantifiers