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Figure 3 | Biotechnology for Biofuels

Figure 3

From: Epigallocatechin gallate incorporation into lignin enhances the alkaline delignification and enzymatic saccharification of cell walls

Figure 3

Generation of benzodioxane units during lignification via β–O–4′-cross-coupling reactions between a monolignol (shown here with coniferyl alcohol only) and pyrogallol or gallate units in epigallocatechin gallate. Internal trapping of the intermediate quinone methide by the o-phenol allows rapid rearomatization without requiring external nucleophilic attack (by water, polysaccharide hydroxyls, or other nucleophiles).

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