Variations in in vitro starch digestion of glutinous rice flour
1996
Zhang, Q. | Abe, T. | Takahashi, T. | Sasahara, T.
Although there have been extensive studies on nonglutinous cultivars of rice (Oryza sativa L.), relatively few studies have focused on glutinous rice. The present study was carried out to examine the in vitro digestion characteristics of the glutinous rice endosperm starches in relation to their physical traits. Twelve glutinous cultivars were classified into two physically different groups (groups I and II) on the basis of their X-ray diffraction patterns. Starches of rice flour from these cultivars were digested in vitro by alpha-amylase and thereafter by glucoamylase. The digestion percentages of starches by glucoamylase were significantly higher in the cultivars in group II than in those in group I at every sampling time, except for those at 24 h, and were also significantly higher at and after 6 h in the case of alpha-amylase digestion. These results suggest that the physical traits of glutinous rice starches in groups I and II may be closely associated with their biochemical traits. Kjeldahl N concentrations were not significantly different between groups I and II, suggesting that it is not related to the physical and chemical traits of glutinous rice.
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