Characterisation of Flavonoid Aglycones by Negative Ion Chip-Based Nanospray Tandem Mass Spectrometry

Table 1

Table of the characteristic sequences of neutral losses, from their corresponding [M-H]⁻ precursor ions and characteristic low-mass product ions, for the four flavonoid classes analysed in this study.

Flavonoid class	Characteristic neutral losses	Characteristic productions
Flavonols (1 and 2)	−28, −44, −18	151, 125, 107
Flavones (3 and 4)	−28, −44, −44, −28, −42	151, 121, 107
Flavanones (5 and 6)	−18, −44, −44, −18, −42	151, 125, 107
Flavanols (7 and 8)	−18, −44, −44, −18, −42	137, 125, 109