It was noted that pretreatment with freezing at 20 C could
preserve the texture of the final product since the freezing rate
used for the pretreatment fell into the rapid freezing category,
which could retard the cooked rice starch retrogradation and improve
the cooked rice microstructure to withstand the stresses
during subsequent drying. Yu et al. (2010) also reported that rapid
cooling could limit starch retrogradation, resulting in the hardness
of cooked rice frozen at a high cooling rate significantly different
from that of the freshly cooked rice