Glucoamylase production by Aspergillus niger on rice bran is improved by adding nitrogen sources

Corn steep liquor, peptone or NH _inf4 ^sup+ salts increased the yield of glucoamylase from Aspergillus niger growing in a solid-state fermentation on rice bran up to 360 IU/g dry substrate over 96 h at 30°C.The authors are with the Biotechnology Unit, Regional Research Laboratory, CSIR, Trivandrum-695 019, India;