Fig. 6

Application in modified SSF system and the traditional tea stalk SSF system. a Cell growth and enzyme activity in the modified SSF system. b Tannase productivity in the modified SSF system. c Comparison of tannase production reported by a previous study and that reported by the present study in the traditional tea stalk SSF system. Note: A: Maximum tannase activity under the optimized conditions with A. niger JMU-TS528 in a previous study [13]; B: Maximum tannase activity under the optimized conditions with A. tubingensis in a previous study [26]; C: Maximum tannase activity under the optimized conditions with A. tubingensis in the previous study