Fig. 5From: Effect of media and fermentation conditions on surfactin and iturin homologues produced by Bacillus natto NT-6: LC–MS analysisEffect of activated carbon powder (ACP) and attapulgite powder (AP) addition to Landy medium on surfactin homologue concentrations (a), iturin homologue production (b), and lipopeptides production (c). Values are mean ± SD, n = 3. The different letters indicate significant differences between treatments (p < 0.05)Back to article page