EFFECT OF GLUCOSE-CONCENTRATION ON THE BIOMASS AND PHYTASE PRODUCTIONS AND THE REDUCTION OF THE PHYTIC ACID CONTENT IN CANOLA-MEAL BY ASPERGILLUS-CARBONARIUS DURING A SOLID-STATE FERMENTATION PROCESS

It was found that an increase in the glucose amount up to and including 6 g per system in the initial solid-state culture medium resulted in an increase in the rates of the biomass growth, enzyme concentration, and phytic acid content reduction in canola meal. Inhibition of the rates of the above processes was noticed in the systems with initial glucose amounts of 12 and 24 g. The canola meal systems with 12 and 24 g of glucose had longer growth phases than those tested with lower glucose amounts, and this resulted in their higher maximum enzyme activities. Logistic law was used to model the biomass production. Models that relate the enzyme production and the phytic acid content reduction with the time of the solid-state fermentation process for each glucose concentration are given, and they fit the experimental data produced in this work reasonably well.