Freshly cooked rice sample obtained from the electric cooker
was washed by water at ambient temperature for 30 s. The freshly
cooked rice was placed in a circular tray and then frozen at 35 C
for 12 h before drying by a freeze dryer (Heto, model Lyolab 3000,
Allerød, Denmark). The moisture content of cooked rice after freezing
was about 246% (d.b). The drying operation was carried out in
the temperature range of 45 to 50 C and pressure of 0.013 Pa
for 24 h. The freshly cooked rice sample obtained from boiling
was not dried by freeze drying because this drying method deteriorated
the texture of the cooked rice.