Occurrences
They have been found in the cell walls of most plants, but are present at higher levels in the grasses (Poaceae) and also sugar beet and Chinese water chestnut.
The 8-O-4'-DiFA tends to predominate in grasses, but 5,5'-DiFA predomintes in barley bran. Rye bread contains ferulic acid dehydrodimers.
In chufa (tiger nut, Cyperus esculentus) and sugar beet the predominant diferulic acids are 8-O-4'-DiFA and 8,5'-DiFA respectively.
Read more about this topic: Diferulic Acids
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