The high proportion of cellulosic glucose (43.1–52.4%) revealed that cellulose was the major polysaccharide in the insoluble FRFs.
The sugars,including arabinose, rhamnose and uronic acid, constituted up to 21.2–25.8% of the total sugars, suggesting
the presence of arabinose-rich pectic substances.
The xylose-containing polymer in the insoluble FRFs could possibly be a xylose-rich hemicellulose, comprising xylose, arabinose, galactose, glucose and mnannose (Igartuburu et al., 1998; Schneeman, 1986).