Abstract
Fungal treatment of lignocellulose is an ecologically and economically acceptable method. However, it needs improvement to increase the hydrolysis rate. A novel combination of multiple response optimization of ligninolytic activity of Trametes hirsuta F13 and supplementation of the lignocellulosic substrate (beechwood sawdust) with sugar beet molasses stillage was employed to improve and manage the desired type of fungal ligninolytic activity leading to a significant enhancement of biomass saccharification. Obtained optimal cultivation conditions (molasses stillage concentration, 13%; substrate moisture, 63%; and temperature, 25 °C) provided the desired combination of laccase and manganese-dependent peroxidase activity, and maintained the activities longer and at higher values (51.5 ± 3.5 U/L and 91 ± 4.24 U/L, respectively) than the conditions without molasses stillage (21.5 ± 2.12 U/L and 31.5 ± 4.9 U/L, respectively). Enzyme hydrolysis of the substrate treated for 7 days in the presence of molasses stillage released 20.54 ± 0.80 mg/mL fermentable sugars, and 63.58 ± 1.47 mg/mL from 18-days treated substrate, while sugar concentrations released from the substrates pretreated without the supplementation were 16.84 ± 0.30 mg/mL and 53.63 ± 2.16 mg/mL, respectively. The proposed new approach of the lignocellulose supplementation with sugar beet molasses stillage and manipulation and improvement of fungal ligninolytic activity proved to be a promising solution for the enhancement of lignocellulose bioconversion.
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Research presented in this paper was funded by the Ministry of Education, Science and Technological Development, Republic of Serbia [Project #I-1]. It is a part of Scientific and Technological Collaboration of Republic of Serbia and People’s Republic of China.
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Contributed the idea for the research (Jelena Jović and Ljiljana Mojović); created models, performed the model analysis, conducted a research and performed the experiments, wrote original draft, and performed editing (Jelena Jović); performed some experiments, wrote original draft (Jian Hao and Sunčica Kocić-Tanackov); supervised the experiments, wrote, revised, and edited the manuscript (Ljiljana Mojović). All authors read and approved the final manuscript.
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Jović, J., Hao, J., Kocić-Tanackov, S. et al. Improvement of lignocellulosic biomass conversion by optimization of fungal ligninolytic enzyme activity and molasses stillage supplementation. Biomass Conv. Bioref. 12, 2749–2765 (2022). https://doi.org/10.1007/s13399-020-00929-1
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DOI: https://doi.org/10.1007/s13399-020-00929-1