Enhancement of Surfactin and Fengycin Production by Bacillus mojavensis A21: Application for Diesel Biodegradation

Figure 3

Effect of different nitrogen sources on growth and lipopeptides production by B. mojavensis A21. YE: yeast extract, SP: soya peptone, AS: ammonium sulphate, AN: ammonium nitrate, Glu: glutamic acid, and Asp: aspartic acid. The combination of glutamic acid and yeast extract in the basal medium, containing 20 g/L glucose, was replaced with different nitrogen source at a concentration of 5 g/L. Other combinations (yeast extract, 1 g/L, + glutamic acid 5 g/L, yeast extract, 1 g/L, + aspartic acid, 5 g/L, and yeast extract, 1 g/L, + glutamic acid, 5 g/L, + ammonium sulphate, 1 g/L) were also tested.