568043.fig.002a
(a)
568043.fig.002b
(b)
568043.fig.002c
(c)
568043.fig.002d
(d)
568043.fig.002e
(e)
568043.fig.002f
(f)
Figure 2: HPLC-MS-MS spectra of phenolic acids ( 179 of caffeic acid (a), 353 of 3-o-caffeoylquinic acid (b), 515 of 3,4-dicaffeoylquinic acid (c), 515 of 3,5-dicaffeoylquinic acid (d), 515 of 1,5-dicaffeoylquinic acid (e), and 515 of 4,5-dicaffeoylquinic acid (f)).