Biotransformation of solid waste from cassava starch production by Rhizopus in solid state fermentation .2. Optimization of the culture conditions and growth kinetics

Ideal conditions to biotransformation of solid waste from cassava starch production (cassava bagasse) by Rhizopus oryzae 28627 in solid state fermentation were determined. These conditions were : temperature, 28-32 degrees C;inoculation rate, 10(5) spores/g dry bagasse; initial moisture, 70%; C/N, 4.7-14;initial pH, 5.7-6.4. Mould growth evaluated trough synthesized real protein determination showed that its content goes from 1.67 g/100 g dry bagasse when inoculation to 12 g/100 g dry bagasse after 24 h of fermentation. Yield coefficient beteween consumed starch and synthesized protein was about 0.50.