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American Journal of Clinical Nutrition, Vol 61, 75-81, Copyright © 1995 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Influence of the physical form of barley grain on the digestion of its starch in the human small intestine and implications for health

G Livesey, JA Wilkinson, M Roe, R Faulks, S Clark, JC Brown, H Kennedy and M Elia
Institute of Food Research, Norwich Research Park, Colney, UK.

It has been suggested that incomplete digestion of cereal starch explains the low energy values of certain cereals of large particle size. We used human subjects with ileostomies to investigate the digestion of barley and to determine whether the physical form of barley affects stomal excretion of starch, glucooligosaccharides, nitrogen, fat, and calculated energy. Only 2 +/- 1% of starch remained undigested after finely milled barley was eaten, but after flaked barley was eaten 17 +/- 1% resisted digestion, partly as oligosaccharides (G1-G10) but largely as intact unpitted starch granules bound by intact cell walls. The calculated energy excretion from the stoma was three times higher after flaked than after milled barley [51.5 decreasing to 15.3 kJ/g nonstarch polysaccharide (NSP, P < 0.001]. NSP, starch, and fat made almost equal contributions to the higher energy excretion. It is concluded that possibly the botanical source of cereals and certainly processing, other than retrogradation of the starch, are important determinants of starch digestibility and energy value. Possible clinical implications are introduced.


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