The IDF fractions from both pseudocereals contained higher ash content than the cereals but only amaranth was significantly higher (Fig. 3c). These results are supported by previous reports showing that mineral contents of quinoa seeds are higher than those of cereals such as wheat (Koziol, 1992; Ranhotra et al., 1993). Lignin content (Fig. 3d) in both cereal IDF samples was approximately 10%, quinoa IDF was slightly less (9%) but lignin content for amaranth was significantly lower (5%) than the rest. Lignin content for bran from whole quinoa seeds has been reported to range from 6–7% (Repo-Carrasco-Valencia & Serna, 2009), which is similar to what has been reported here for quinoa IDF. Since lignin, a high molecular weight polymer of aromatic compounds,serves to entrap the polymers that make up the cell wall, it renders the polymers insoluble and difficult to isolate or degrade (MacDougall & Selvendran, 2001). The lower lignin content found in the IDF fractions of the pseudocereals, especially for amaranth, likely contributes to their higher proportion of soluble fibre content than cereals. Accordingly, lignin content correlated negatively (R2 = 0.88) with the soluble fibre content
The IDF fractions from both pseudocereals contained higher ash content than the cereals but only amaranth was significantly higher (Fig. 3c). These results are supported by previous reports showing that mineral contents of quinoa seeds are higher than those of cereals such as wheat (Koziol, 1992; Ranhotra et al., 1993). Lignin content (Fig. 3d) in both cereal IDF samples was approximately 10%, quinoa IDF was slightly less (9%) but lignin content for amaranth was significantly lower (5%) than the rest. Lignin content for bran from whole quinoa seeds has been reported to range from 6–7% (Repo-Carrasco-Valencia & Serna, 2009), which is similar to what has been reported here for quinoa IDF. Since lignin, a high molecular weight polymer of aromatic compounds,serves to entrap the polymers that make up the cell wall, it renders the polymers insoluble and difficult to isolate or degrade (MacDougall & Selvendran, 2001). The lower lignin content found in the IDF fractions of the pseudocereals, especially for amaranth, likely contributes to their higher proportion of soluble fibre content than cereals. Accordingly, lignin content correlated negatively (R2 = 0.88) with the soluble fibre content
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