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. 2016 May 1;151:148–156. doi: 10.1016/j.talanta.2015.12.062

Table 1.

Optimized tuning conditions for analysis of methylpyridinium derivatives of estrogens.

Analyte Precursor ionm/z Product ionsm/z Collision energy (V) Collision cell exit potential (V) De-clustering potential (V) Entrance potential (V)
E1 362 238* 57 10 136 10
252$ 57 10
E2 364 128* 19 18 51 10
110$ 39 10
13C2E1 364 240* 55 10 61 10
254$ 57 12
13C2E2 366 130* 63 28 76 10
110$ 59 12
d4E1 366 240* 59 22 81 10
254$ 57 24
d4E2 368 130* 39 14 56 10
111$ 23 10

Voltage (V); estrone (E1); estradiol (E2); 3,4-[13C]2-estrone (13C2E1); 2,4,16,16-[2H]4-estrone (d4E1); 3,4-[13C]2-estradiol (13C2E2); 2,4,16,16-[2H]4-estradiol (d4E2); quantifier (*) and qualifier ($).