FRF, while the other non-sugar components (e.g. Klason lignin) ranged from 41.3 to 47.5 g/100 g FRF. Among the sugars of the insoluble FRFs, the predominant sugars were glucose (50.1–53.7%) and xylose (17.7–22.4%), followed by arabinose (10.7–14.8%), uronic acid (7.05–9.07%), rhamnose (1.48–4.94%) and galactose (2.67–3.27%).