Polishing significantly reduced the concentration of TSPCs in all genotypes (Table 2). The distribution of polyphenols in the rice grains was evaluated. It was observed that in the genotype with a light brown pericarp color, 62% of the phenolic compounds were in the pericarp, whereas in the grains with red and black pericarp colors, the phenolic compounds in the pericarp varied between 92% and 97% (Fig. 2). Similar results were reported by Zhou et al., 2004 and Hu et al., 2003, with the bran accounting for 70 to 90% of the phenolic acids in light brown pericarp color grains, and around 85% of the anthocyanins in black pericarp color rice grains. The results demonstrate that the phenolic compounds in rice are mainly associated with the pericarp. Therefore, polishing, which removes the external layers of the grain, significantly reduces the concentration of TSPCs in polished rice grains.