3. Results and discussion
3.1. Media selection for solid-state fermentation and ethanol
fermentation
The solid culture media were composed of the inexpensive and
widely available agroindustrial byproducts RW, BW and RB. All A.
niger strains produced enzyme complexes in the tested media;
however, the enzyme complex activity depended on the media and
strains. The strain A. niger ATTC 16404 had better activity in RW, BW and RB media and produced enzyme complexes with higher activity (40 U/g) when grown on RWthan when grown on BWand RB
(Fig. 1). Based on these results, A. niger ATTC 16404 was selected for further experiments.