Figure 1.

Monolignols, monolignol-p-coumarates, and flavonoids released from the rind lignin of papyrus by DFRC. A, Total-ion chromatogram of the DFRC degradation products released from the MWL lignin isolated from papyrus rind, showing the presence of naringenin (N), naringenin chalcone (Nch), dihydrotricin (dhT), and tricin (T), as their acetate derivatives. cG_pCA, tG_pCA, cS_pCA, and tS_pCA are the cis- and trans-coniferyl- and sinapyl-dihydro-p-coumarates, as their acetate derivatives. B, Electron-impact mass spectra and structures of naringenin (N), naringenin chalcone (Nch), dihydrotricin (dhT), and tricin (T), as their acetate derivatives. Note that the p-coumarates are converted to dihydro-p-coumarates during DFRC degradation.