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Grasses are a predominant source of nutritional energy for livestock systems around the world. Grasses with high lignin content have lower energy conversion efficiencies for production of bioenergy either in the form of ethanol or to milk and meat through ruminants. Grass lignins are uniquely acylated with p-coumarates (pCA), resulting from the incorporation of monolignol p-coumarate conjugates into...
Radical coupling reactions between ethyl ferulate (Et-FA), a simple model for feruloyl polysaccharides in planta, and coniferyl alcohol (CA), a monolignol, were studied in order to better understand the polymer cross-coupling interactions among polysaccharides and monolignols or lignin, mediated by ferulate (FA), in plant cell walls. Cross-coupled FA/CA dimers produced in an aqueous buffer (pH 5.0)...
Grass lignins are differentiated from other lignin types by containing relatively large amounts of p-coumaric acid (pCA) acylating the C-9 position of lignin subunits. In the case of a mature corn (Zea mays L.) stems, pCA constitutes 15–18% of a dioxane soluble enzyme lignin. The major portion of the pCA is specifically attached to syringyl residues. Studies with isolated corn wall peroxidases show...
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