Fig. 2From: Ammonium nitrate regulated the color characteristic changes of pigments in Monascus purpureus M9Effects of AN on the concentration of MPs. The concentration of yellow, orange, and red pigments was assessed by absorbance at 410 nm (a), 470 nm (b) and 510 nm (c) from the 3rd to 7th day of fermentation, respectively. The color values were expressed as OD units per gram of dry mycelia. The data were represented as the mean ± SD (n = 3)Back to article page