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  • Title: Parboiling reduced the crystallinity and in vitro digestibility of non-waxy short grain rice.
    Author: Tian J, Cai Y, Qin W, Matsushita Y, Ye X, Ogawa Y.
    Journal: Food Chem; 2018 Aug 15; 257():23-28. PubMed ID: 29622203.
    Abstract:
    The impact of parboiling on starch digestibility of cooked rice was examined through an in vitro digestion model. Results indicated that the equilibrium starch hydrolysis of polished rice was the highest (86.55%), followed by that of parboiled-polished (83.94%), brown (80.59%) and parboiled rice (76.95%). X-ray diffraction analysis indicated that A-type crystals were predominant in brown rice and polished rice, while A-, B- and V-type crystalline structures coexisted in parboiled rice and parboiled-polished rice. Thin and compact layers were observed on the surfaces of parboiled rice and were considered to be physical barriers that reduce the starch digestibility. The study demonstrates that parboiling could change the crystallinity and reduce the starch digestion of rice significantly.
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