Fig. 5From: Biodegradation of alkaline lignin by Bacillus ligniniphilus L1Comparison of absorption peaks of aromatic compounds identified by GC–MS during culturing process. a The variation of absorption peaks at first and fifth days’ incubation. b The proportion of absorption peaks area of aromatic compounds in the fifth days’ incubation. c The proportion of absorption peaks area of aromatic compounds in the control samples. Numbers represent the aromatic compounds were same with Table 1 Back to article page