Trace Level Determination of Polyether Ionophores in Feed

Table 1

LC-MS/MS acquisition for polyether ionophores. The product ions (in bold) were used for the quantification.

Compound	Precursor ion (m/z)	Product ions	Cone Voltage (kV)	Collision gas energy (eV)
Lasalocid	613.6 [M + Na]^+	359.4; 377.4	50	40
Semduramicin	911.4 [M + K]^+	849.6; 867.0	34	40
Monensin	693.7 [M + Na]^+	461.4; 675.7	60	40
Salinomycin	773.8 [M + Na]^+	431.4; 531.5	70	45
Narasin	787.8 [M + Na]^+	431.4; 531.5	60	50
Maduramicin	954.8 [M + K]^+	893.3; 911.3	34	40