Factors Level 1 Level 2 Level 3 Level 4
pH 5 6 7 8
Temperature (°C) 25 30 35 40
Dye concentration (ppm) 25 50 75 100
Carbon source Glucose Starch Sucrose Lactose
Nitrogen source Yeast extract Peptone (NH4)NO3 (NH4)2(SO44)
Table 1: Different parameters and levels used, to design orthogonal array.