Iodine-stained cross-sections of cooked rice grains revealed the significant differences between brown rice with and without plasma treatment. The blue staining of brown rice without plasma treatment only appeared in the centre of endosperm. The region of blue staining increased with the increasing kV of the plasma treatment (Fig. 4). Meanwhile, significant decreases in brightness (L) and yellow value (b) of the iodine-stained cooked brown rice flours were observed with the progressive increase in kV of plasma. There was a reverse tendency in redness, a (Table 2). In addition, the WI values of iodine-stained cooked brown rice flours were significantly decreased with the increasing kV of plasma. Overall, plasma treatment resulted in a loose structure of cooked brown rice, which increased the quantity of the iodine-stained area, and thereby decrease the white index of iodine-stained rice.