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. 2022 Jul 11;23(8):3349–3358. doi: 10.1021/acs.biomac.2c00457

Figure 2.

Figure 2

2D HSQC NMR of lignin extracted by cyclic organosolv process from Norway spruce inner bark in DMSO-d6. The main lignin interunit linkages are depicted to the right of the spectrum. β-O-4′ aryl ethers; β-5′ phenylcoumarans; β–β′ resinols; 5-5′ dibenzodioxocins (DBDO); Hibbert’s ketone (HK); β-O-4’/3-O-α benzodioxane structure formed through coupling of coniferyl alcohol and astringin; 8-O-4’/3′-O-7 benzodioxane structure formed by stilbene glucoside units; Stilbene-β1’; Stilbene-β5’. Note that the glucoside units of the hydroxystilbene glucosides have been cleaved under the organosolv conditions.