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The negative-ion reflectron-mode MALDI-TOF mass spectra of flavonoid glycosides. (a) Kaempferol-3-O-glucoside (Kmp-3-Glc); (b) kaempferol-7-O-glucoside (Kmp-7-Glc); (c) luteolin-4'-O-glucoside (Lut-4'-Glc); (d) luteolin-7-O-glucoside (Lut-7-Glc). The left and middle panels are enlargements around m/z 285 and 447 regions, respectively, of the spectra shown on the right
