3.4. Detection of endoglucanase activity by zymogram
staining
The extracts obtained by culturing A. fumigatus P40M2 on
wheat bran and soybean, showed the expression of three
forms of endoglucanases (Ia, Ib and Ic) and in the bagasse only
two EG isoforms on native PAGE (Fig. 9). Soni et al. [30] related
four isoforms in the presence of corn cob and in the bagasse
only two EG isoforms. Grigorevski-Lima et al. [32] showed the
expression of six EG isoforms in the presence of sugarcane
bagasse under submerged culture. The observed differential
expression of cellulases can be attributed to a structural
heterogeneity of the cellulosic substrates, as well as differences
in culture conditions during cultivation [46]. Such
multiple forms of endoglucanases have also been reported in
different Aspergillus strains.