Identification and Structural Characterization of Unidentified Impurity in Bisoprolol Film-Coated Tablets

Table 3

UV absorbance and mass spectral data for bisoprolol and the target impurity.

Compounds			ions m/z	MS^2 ions m/z	MS^3 ions m/z
Bisoprolol	16.2	272		222; 116	72
Impurity; RRT 0.95	15.9	272		302; 196	284; 196

most abundant ions are shown in bold. ion obtained in positive ionization (protonation → M+H⁺).