3.1.3. Effect of initial pH value on cellulase synthesis
To evaluate the effects of initial pH value in solid substrate on cellulase synthesis, the initial pH values were adjusted by the addition of lime slurry to 4.5, 5.0, 5.5 and 6.0, respectively. The corncob residue with an original pH value 2.8 was also used in solid state fermentation. The results of three batch solid state fermentation with a different initial substrate pH value are listed in Table 1. The cultivation period for each
batch was 6 days.
The original corncob residue of pH 2.8 was unsuitable
for cellulase production since the low pH value
resulted in poor growth. In contrast, if the initial pH
value of the substrate was between 4.5 and 6.0, no
significant effect was observed on cellulase production