Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 59, Issue 13, Pages 7353-7359Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jf200402u
Keywords
Cereal starch granules; digestion; pig; kinetic characteristics
Funding
- National Science Council of Taiwan [NSC 95-2313-B-005-013]
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The main objective of this research was to study the characteristics of starch granules and their influences on in vitro and pig prececal starch digestion of corn, dehulled barley, wheat, and potato. Scanning electron microscopy was used to study the starch endosperm structure in the parent material as well as in vitro starch digestion. The results showed that corn starch granules were polyhedral, with a diameter ranging from 2 to 10 mu m, whereas those of dehulled barley and wheat were spherical, with a diameter ranging from 5 to 20 mu m. Potato had the largest starch granules among starch sources reported herein, with oval spheres of 10-50 mu m in diameter. In vitro starch hydrolysis showed that starch granules of corn degraded faster than the starch of dehulled barley and wheat, with the potato starch being degraded the slowest. The in vivo digestibility trial using ileal-cannulated pigs confirmed the starch degradation of grains. The in vitro (x, %) and in vivo (y, %) digestibility were highly correlated [y = 6.5304x - 538.48 (R-2 = 0.9924)]. On the basis of the results, in vitro starch hydrolysis might be useful in predicting in vivo prececal starch digestibility. The digestion kinetic characteristics of different starch sources might be employed to evaluate the starch digestive rate at the pig ileum.
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