Fig. 3

Effect of d-tryptophan and l-alanine addition on CHA production and dry cell weight by Aspergillus fumigatus CY018. a The initial addition of d-tryptophan and l-alanine, b l-alanine addition time, with addition concentration of 10 mM, c d-tryptophan addition time, with the addition concentration of 10 mM, and d different d-tryptophan addition concentrations at 192 h