Fig. 5

a Effect of different times of incubation on endoxylanase activity by A. niger Isl-9 under SSF. b Effect of different times of incubation on protein content of enzyme by A. niger Isl-9 under SSF. c Effect of different times of incubation on the turbidity of fermentation broth by A. niger Isl-9 under SSF. d Effect of different times of incubation on the final weight of the substrate by A. niger Isl-9 under SSF. e Effect of different times of incubation on final pH of fermentation broth by A. niger Isl-9 under SSF. Incubation temperature 30 °C, wheat bran 15 g, MC1 10 mL at pH 7.8, MC5 10 mL at pH 6.2, inoculum size 1 mL)