초록
<P><B>Abstract</B></P> <P>The development of more productive strains of microorganisms and processes that increase enzyme levels can contribute to the economically efficient production of second generation ethanol. To this end, cellulases and xylanases were produced with the S1M29 mutant strain of <I>Penicillium echinulatum</I>, using different concentrations of cellulose (20, 40, and 60gL<SUP>−1</SUP>) in batch and fed-batch processes. The highest activities of FPase (8.3UmL<SUP>−1</SUP>), endoglucanases (37.3UmL<SUP>−1</SUP>), and xylanases (177UmL<SUP>−1</SUP>) were obtained in fed-batch cultivation with 40gL<SUP>−1</SUP> of cellulose. The <I>P. echinulatum</I> enzymatic broth and the commercial enzyme Cellic CTec2 were tested for hydrolysis of pretreated sugar cane bagasse. Maximum concentrations of glucose and xylose were achieved after 72h of hydrolysis. Glucose yields of 28.0% and 27.0% were obtained using the <I>P. echinulatum</I> enzymatic extract and Cellic CTec2, respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fed-batch procedures contribute to increase the cellulases production. </LI> <LI> <I>P. echinulatum</I> enzymes hydrolyze efficiently pretreated sugar cane bagasse. </LI> <LI> High titers of filter paper activity were obtained in fed-batch with cellulose. </LI> </UL> </P>