Table 1: LC-MS/MS acquisition for polyether ionophores. The product ions (in bold) were used for the quantification.

CompoundPrecursor ion (m/z)Product ionsCone Voltage (kV)Collision gas energy (eV)

Lasalocid613.6 [M + Na]+359.4; 377.45040
Semduramicin911.4 [M + K]+849.6; 867.03440
Monensin693.7 [M + Na]+461.4; 675.76040
Salinomycin773.8 [M + Na]+431.4; 531.57045
Narasin787.8 [M + Na]+431.4; 531.56050
Maduramicin954.8 [M + K]+893.3; 911.33440