Table 4 Effect of different nitrogen source and concentrations of peptone on EPSs production

Nitrogen sources

 NaNO₃

2.51 ± 0.2^b

0.37 ± 0.02^b

 Peptone

3.03 ± 0.2^a

0.39 ± 0.02^a

 Yeast extract

1.52 ± 0.1^c

0.29 ± 0.01^c

 NH₄NO₃

1.24 ± 0.1^d

0.25 ± 0.01^d

 Urea

1.33 ± 0.1 ^cd

0.24 ± 0.01^d

 Gelatin

0.90 ± 0.04^e

0.20 ± 0.01^f

 Ammonium chloride

0.78 ± 0.05^e

0.22 ± 0.01^e

Concentration of peptone (g)

 1.5

2.50 ± 0.2^e

0.27 ± 0.01^e

 3

2.70 ± 0.2^d

0.30 ± 0.02^d

 6

3.05 ± 0.3^c

0.38 ± 0.02^b

 10

3.81 ± 0.3^a

0.40 ± 0.02^a

 12

3.52 ± 0.2^b

0.35 ± 0.02^c