3. Results and discussion
The concentration of TSPCs differed significantly among the genotypes (Table 1). Higher concentrations of TSPCs were observed for the grains with red and black pericarp colors, which were 7 to 15 times higher than the TSPCs concentrations of grains with a light brown pericarp color. Similar results were obtained by other researchers. Goffman and Bergman (2004) reported mean concentrations of 69, 213 and 274 mg GAE 100 g−1 for light brown, red and black pericarp color rice grains, respectively, while Shen, Jin, Xiao, Lu, and Bao (2009) reported mean concentrations of 151.8, 470.1 and 1055.7 mg GAE 100 g−1 for light brown, red and black pericarp color grains, respectively.