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Table 1 The optimized results of compound nitrogen source

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

Nitrogen source C. butyricum viable counts (× 107 cfu/mL) C. butyricum spores (× 107 cfu/mL) Spore rate (%)
Group1
Group2
Group3
Group4
Group5
Group6
Group7
Group8
Group9
Contrast
4.8
7.1
3.1
4.0
5.0
1.8
4.5
4.2
2.3
5.6
4.1
5.8
2.4
2.2
1.7
0.9
2.1
2.7
1.3
3.5
85.4
81.7
77.4
55.0
34.0
50.0
46.7
64.3
56.5
62.5
  1. Group1 to 9 indicate the combination of corn steep powder with soybean meal powder, peptone, beef paste, fishmeal, tryptone, yeast extract, yeast, NH4Cl and (NH4)2SO4 respectively. The ratio of corn steep powder to other nitrogen sources is 1:1, and the total nitrogen source content is 15 g/L. 15 g/L corn steep powder was used as control