2.5.2. Fed-batch enzymatic hydrolysis
Fed-batch enzymatic hydrolysis was carried out at pH 4.8 and 50 °C in a 5 l reactor with a working volume of 3 l. Experiments were started with 100 g l−1 substrate and enzyme loadings of 20 FPU g−1 substrate and 6.5 CBU g−1 substrate. Cellulosic residue was then added twice at 6 and 12 h to get a final substrate concentration of 200 g l−1, simultaneously adding certain amount of cellulase and cellobiase (enzyme loadings of 10 FPU g−1 fed substrate and 6.5 CBU g−1 fed substrate). The total hydrolysis time was set 60 h.