Abstract
The amount of soluble dietary fibre, not corrected for minerals and protein, in rye inbred lines is highly correlated with digestibility of rye grain protein ( r = -0·82). The presence of hydroxyproline in these soluble non-digestible compounds indicates binding of polysaccharides to protein; the content of hydroxyproline in the nondigestible rye protein is significantly higher than in wheat protein. Non-digestible polysaccharides of rye grain and its soluble dietary fibre contain more fructose and pentosans (mainly xylose) than wheat grain and its soluble fibre. The arabinose/xylose ratio in rye is 1:1·6 and in wheat 1:1·2; the amount of non-digestible xylose in rye grain is about 20 % higher than in wheat.
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