Figure 2.

Aromatic regions of 2D ¹H-¹³C correlation (HSQC) spectra. Results were obtained from gels of lignified cell walls of commelinid monocotyledon species in DMSO-d₆/pyridine-d₅ (4:1): Baloskion tetraphyllum (A), Elegia capensis (B), Cyperus papyrus (C), Juncus inflexus (D), Typha orientalis (E), Ananas comosus (F), Hedychium gardnerianum (G), Strelitzia reginae (H), Dichorisandra thyrsiflora (I), and Phoenix canariensis (J). Structures of lignin subunits, phenolic esters, and amino acids that are known to be present in plant cell walls are shown below. The substructure units are color coded to match their assignments in spectra A to J.