Phenolic acids and their carbohydrate esters in rice endosperm cell walls

Ferulic acid, p-coumaric acid and diferulic acid were detected in the alkaline extract of rice endosperm cell walls. The amount of each component was estimated as 9.1, 2.5 and 0.56 mg/g cell wall, respectively. Several phenolic-carbohydrate esters were isolated from the enzymatic digest of this cell wall, which included a series of ferulic acid esters of arabinoxylan fragments and also some fractions containing a high proportion of diferulic acid.