Abstract
Penicillium echinulatum was evaluated as a cellulolytic enzyme producer in shaking flasks and bioreactor submerged culture using sugarcane bagasse as carbon source. Sodium hydroxide delignified steam-exploded pretreated bagasse (SDB) and hydrothermal pretreated bagasse had a maximum filter paper activity (FPase) of 2.4 and 2.6 FPU/mL, respectively. Delignified acid pretreated bagasse and Celufloc 200TM (CE) carbon sources displayed maximum FPase of 1.3 and 1.6 FPU/mL while in natura bagasse (INB) provided the lowest enzyme activity, ca. 0.4 FPU/mL. Measurement of surface specific area of lignocellulosic material and scanning electron microscopic images showed a possible correlation between fungal mycelia accessibility to lignocellulosic particles and obtained cellulolytic enzyme activity of fermentation broth. Fed-batch experiments performed in a controlled bioreactor attained the highest value of FPase of 3.7 FPU/mL, enzyme productivity of 25.7 FPU/L h, and enzyme yield from cellulose equal to 134 FPU/g with SDB. Enzyme hydrolysis of steam-pretreated bagasse accomplished with the obtained supernatant of fermentation broth (10 FPU/g of biomass and 5 % w/v) performed better than commercial cellulose complex. The results showed that P. echinulatum has potential to be used as an on-site enzyme platform aiming second bioethanol production from sugarcane lignocellulosic residue.
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Acknowledgments
The authors would like to thank Dr. Aldo J. P. Dillon for providing the P. echinulatum, the technicians of the National Laboratory of Science and Technology of Bioethanol (CTBE) for assistance during the experiments, and LME/LNLS for technical support during the electron microscopy work.
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Pereira, B.M.P., Alvarez, T.M., da Silva Delabona, P. et al. Cellulase On-Site Production from Sugar Cane Bagasse Using Penicillium echinulatum . Bioenerg. Res. 6, 1052–1062 (2013). https://doi.org/10.1007/s12155-013-9340-5
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DOI: https://doi.org/10.1007/s12155-013-9340-5