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Table 2 The orthogonal experiment design table (L9 (33) for carbon

From: Optimization of an economical medium composition for the coculture of Clostridium butyricum and Bacillus coagulans

Level Bran (g/L) Peptone (g/L) Corn steep powder (g/L) C. butyricum viable counts (× 107 cfu/mL) C. butyricum spores (× 107 cfu/mL)
1 20 15 5 5.8 4.4
2 10 10 15 8.5 7.4
3 20 5 15 6.1 5.2
4 10 15 10 7.4 5.7
5 15 15 15 8.2 6.1
6 20 10 10 5.6 3.9
7 15 10 5 6.5 3.5
8 15 5 10 3.1 2.7
9 10 5 5 5.8 3.5
‾K1a 7.23 5.00 6.03   
‾K2a 5.93 6.87 5.37   
‾K3a 5.83 7.13 7.60   
RA 1.40 2.13 2.23   
‾K1b 5.53 3.80 3.80   
‾K2b 4.10 4..93 4.10   
‾K3b 4.50 5.40 6.23   
RB 1.43 1.60 2.43   
  1. K value stands for the mean value, for example, K1a, K2a and K3a correspond to A are the mean values of factor A, at level 1, level 2, and level 3, respectively, and so on. R stand for range value, correspond to the different between the highest k value and the lowest k value. English letter A and B in rang analysis results stand for the results of C. butyricum DL-1 viable counts and spore yields, respectively