Raw rice was washed by placing 450 g portions of rice in an
electric compact rice washer (KOM-3, Izumi Products Co., Nagano,
Japan) and then adding 600 mL of deionized water. The first washing
lasted 10 s, and the second and third washings lasted 30 s each.
These washing times were determined according to the recommendation
of the rice-washer manual. The water was decanted,
600 mL more water was added, then 40 g washed rice was sampled
at each washing time. Triplicate experiments were conducted on
different days. Two analytical samples (washed rice and washing
water) for each washing in each experiment were analysed.