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Effects of gamma irradiation on starch digestibility of rice with different resistant starch content

Authors

  • Xiaoli Shu,

    1. State Key Laboratory of Rice Biology, IAEA Collaborating Center, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China
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  • Jianwei Xu,

    1. State Key Laboratory of Rice Biology, IAEA Collaborating Center, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China
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  • Ying Wang,

    1. State Key Laboratory of Rice Biology, IAEA Collaborating Center, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China
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  • Søren K. Rasmussen,

    1. Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Frederiksberg c, Denmark
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  • Dianxing Wu

    Corresponding author
    • State Key Laboratory of Rice Biology, IAEA Collaborating Center, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou, China
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Correspondent: Fax: +86 571 86971594; e-mail: dxwu@zju.edu.cn

Summary

Three rice cultivars (RS3M, RS4H and RS5L) differing in resistant starch contents but similar in genetic background were chosen to study the effects of gamma irradiation on starch physicochemical properties and digestibility. Irradiation increases the resistant starch content in all the three cultivars and in a dose-dependent manner in rice with low-resistant starch content (RS5L). Irradiation decreases apparent amylose content and gelatinisation temperature and changed the starch granule structure, while increasing V-type crystallinity. Starch enzymatic hydrolysis rate was reduced following irradiation, and the effect of irradiation on reducing starch digestibility was negatively correlated with resistant starch content. Treatment with gamma irradiation has therefore a potential for increasing resistant starch content and producing low digestibility of starch in common rice.

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