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

Figure 1

The structures of the flavonoids analysed. (1) Quercetin (molecular weight = 302); (2) Myricetin (molecular weight = 318); (3) Apigenin (molecular weight = 270); (4) Luteolin (molecular weight = 286); (5) Naringenin (molecular weight = 272); (6) Hesperetin (molecular weight = 302); (7) Catechin (molecular weight = 290) and (8) Epigallocatechin (molecular weight = 306).

(a)

(b)

(c)