“…Mono-substituted Xylp residues at O-2 are rare in wheat and rye, but present in a significant proportion in barley. In wheat arabinoxylans, approximately 66% of the xylose residues, forming the chain backbone, are unsubstituted Xylp (Saulnier, Guillon, Sado, & Rouau, 2007). Moreover, some Araf units carry ferulic acid residues esterified to O-5 of Araf linked to O-3 of the xylose residues; the trans-ferulic acid is the predominant isomer present in wheat arabinoxylans (Sosulski, Krygier, & Hogge, 1982).…”