Fig. 13

Mass spectra of MG intermediates degradation determined by LC–MS analysis (A) desmalachite green (m/z 316, Rt 16.69 min), (B) didesmalachite green (m/z 302, Rt 23.39 min), (C) tetradesmalachite green (m/z 273, Rt 11.24 min), 4-(diphenylmethyl)aniline (m/z 259, Rt 11.24 min), (D) malachite green carbinol (m/z 347, Rt 14.09 min), (E) bis[4-(dimethylamino)phenyl]methanone (m/z 268, Rt 23.55 min), (F) [4-(dimethylamino)phenyl][4-(methyl-amino)phenyl]methanone (m/z 254, Rt 22.39 min), (G) bis[4-(methylamino)phenyl]methanone (m/z 240, Rt 12.47 min), (H) (4-amino- phenyl)[4-(methylamino)phenyl]methanone (m/z 226, Rt 15.63 min), (I) bis(4-amino phenyl)methanone (m/z 212, Rt 7.26 min), (J) (4-amino phenyl)methanone (m/z 197, Rt 5.36 min), and (K) 4-(dimathylamino)benzaldehyde (m/z 149, Rt 6.69 min)