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Table 1 The color characteristics of MPs with AN treatment and the control samples

From: Ammonium nitrate regulated the color characteristic changes of pigments in Monascus purpureus M9

Group Fermentation time (days) CIELAB color system Visual colora
L* a* b* Cabb Habc
Control 3 32.67 60.70 50.94 79.24 40.00 Orangish red
4 19.11 50.86 32.94 60.60 32.93 Orangish red
5 5.53 4.66 3.96 6.11 40.35 Orangish red
6 5.96 4.51 2.40 5.11 28.08 Deep red
7 5.69 4.92 2.33 5.44 25.37 Deep red
NH4NO3 3 88.79 4.75 27.70 28.10 80.26 Light orange
4 54.61 47.25 66.31 81.42 54.46 Middle orange
5 42.36 57.16 70.24 90.56 50.86 Middle orange
6 44.72 57.71 69.34 90.21 50.23 Middle orange
7 36.51 61.71 61.41 87.06 44.86 Orangish red
  1. aThe colors were distinguished by visual inspection
  2. bCab = [(a*)2 + (b*)2]1/2
  3. cHab = tan−1(b*/a*)