Abstract
Rehydration of dried rice noodles (DRNs) is a time-consuming process, which is dominated by the compactness of noodle structure. Therefore, DRNs with differentiated porous structures were prepared, and their effect on the rehydration process was investigated. Porous structure can shorten rehydration time by reducing the time needed for water to migrate into the noodle core, or the water amount required for rehydration. Magnetic resonance imaging showed that although larger pores facilitate absorbing more water, the time for water to migrate into the noodle center is longer than that of medium size pores, as water needs to fill the periphery large hole before inward migration. SAXS analysis demonstrated that the presence of flexible starch molecular chains reduce the water required to achieve the maximum tensile strain of samples, thus shortening the rehydration time. Understanding the acceleration mechanism of porous structure on rehydration contributes to designing improved process of instant noodle products.
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