Biological pretreatment of rice straw by fermenting with Dichomitus squalens

Bak, Jin Seop; Kim, Myoung Dong; Choi, In Geol; Kim, Kyoung Heon

doi:10.1016/j.nbt.2010.02.021

Cited by 55 publications

(18 citation statements)

References 48 publications

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“…This is probably due to the real‐time metabolic conversion of homeostatic energy regulation in the P. chrysosporium cascades, similar to that suggested in the other ligninolytic biosystem (Bak et al. ).…”

Section: Resultssupporting

confidence: 73%

Lignocellulose depolymerization occurs via an environmentally adapted metabolic cascades in the wood‐rotting basidiomycete Phanerochaete chrysosporium

Bak

2014

MicrobiologyOpen

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Plant biomass can be utilized by a lignocellulose-degrading fungus, Phanerochaete chrysosporium, but the metabolic and regulatory mechanisms involved are not well understood. A polyomics-based analysis (metabolomics, proteomics, and transcriptomics) of P. chrysosporium has been carried out using statistically optimized conditions for lignocellulolytic reaction. Thirty-nine metabolites and 123 genes (14 encoded proteins) that consistently exhibited altered regulation patterns were identified. These factors were then integrated into a comprehensive map that fully depicts all signaling cascades involved in P. chrysosporium. Despite the diversity of these cascades, they showed complementary interconnection among themselves, ensuring the efficiency of passive biosystem and thereby yielding energy expenditure for the cells. Particularly, many factors related to intracellular regulatory networks showed compensating activity in homeostatic lignocellulolysis. In the main platform of proactive biosystem, although several deconstruction-related targets (e.g., glycoside hydrolase, ureidoglycolate hydrolase, transporters, and peroxidases) were systematically utilized, well-known supporters (e.g., cellobiose dehydrogenase and ferroxidase) were rarely generated.

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Section: Resultssupporting

confidence: 73%

Lignocellulose depolymerization occurs via an environmentally adapted metabolic cascades in the wood‐rotting basidiomycete Phanerochaete chrysosporium

Bak

2014

MicrobiologyOpen

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“…Consequently, the structural open of lignin by the radical‐mediated cascades was shown to consistently reduce the crystallinity of substrates. For reference, the trend between percent sugar maximum and crystallinity index was confirmed to be negatively controlled (Bak et al ., ), which suggests that the amorphous fraction of lignocellulose is sufficiently depolymerized by extracellular peroxidases.…”

Section: Resultsmentioning

confidence: 99%

“…However, the physicochemical recalcitrance of biomass fabric (especially lignin) is a critical obstacle for the enzymatic hydrolysis of biomass; therefore, relevant physicochemical pretreatments are essential before ethanol fermentation (Himmel et al, 2007;Sanderson, 2011). Recently, in order to address shortcoming of classical processes (Agbor et al, 2011), research on lignocellulolysis has refocused on in-depth biological methodologies with more environmentally friendly steps (Dashtban et al, 2009;Bak et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Complementary substrate‐selectivity of metabolic adaptive convergence in the lignocellulolytic performance by Dichomitus squalens

Bak

2014

Microbial Biotechnology

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The lignocellulolytic platform of the wood-decaying organism Dichomitus squalens is important for production of biodegradable elements; however, the system has not yet been fully characterized. In this study, using statistical target optimization, we analysed substrate selectivity based on a variety of D. squalens metabolic pathways using combined omics tools. As compared with the alkali-lignin (AL) programme, the rice straw (RS) programme has the advantage of multilayered signalling to regulate cellulolytic-related genes or to connect their pathways. The spontaneous instability of the AL programme was accelerated by harsh starvation as compared with that of the RS programme. Therefore, the AL programme converged on cellular maintenance much easier and more rapidly. However, regardless of external substrate/concentration type, the compensatory pattern of the major targets (especially peroxidases and growth regulators) was similar, functioning to maintain cellular homeostasis. Interestingly, ligninolytic-mediated targets under non-kaleidoscopic conditions were induced by a substrate-input-control, and especially this mechanism had an important effect on the early stages of the biodegradation process. This optimized target analysis could be used to understand lignocellulolytic network and to improve downstream efficiency.

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“…This higher yield is expected due to additional ethanolysis treatment compared to this study using only C. subvermispora pretreatment. Bak et al [9] reported that when fungal fermented rice straw with Dichomitus squalens was used as a substrate in SSF, the bioethanol yield was 54.2% after 24 h. Other works on production of ethanol from biomass treated with microorganism were 0.017 g of ethanol/g of corn stover after 144 h fermentation [42] and 0.004–0.027 g of ethanol/g of dry lignocelluloses after 48 h fermentation [43]. The bioethanol yields from these previously conducted studies are much lower than the yield obtained in this study (0.003–0.143 g of ethanol/g of dry rubberwood).…”

Section: Resultsmentioning

confidence: 99%

“…In general, pretreatment can be classified into physical pretreatment physicochemical pretreatment, chemical pretreatment, and biological pretreatment [7]. However, physical and chemical pretreatment need high temperature treatment with acid or alkali, which disrupts lignocellulose and also results in acidic or caustic hydrolysate and the production of inhibitory byproducts [8, 9]; therefore, such pretreatment methods increase the cost of processes with neutralization or washing step that results in the loss of sugars [6, 10]. Consequently, it is necessary to develop a benign alternative to harsh chemicals.…”

Section: Introductionmentioning

confidence: 99%

Biological Pretreatment of Rubberwood withCeriporiopsis subvermisporafor Enzymatic Hydrolysis and Bioethanol Production

Nazarpour

Abdullah

et al. 2013

BioMed Research International

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Rubberwood (Hevea brasiliensis), a potential raw material for bioethanol production due to its high cellulose content, was used as a novel feedstock for enzymatic hydrolysis and bioethanol production using biological pretreatment. To improve ethanol production, rubberwood was pretreated with white rot fungus Ceriporiopsis subvermispora to increase fermentation efficiency. The effects of particle size of rubberwood (1 mm, 0.5 mm, and 0.25 mm) and pretreatment time on the biological pretreatment were first determined by chemical analysis and X-ray diffraction and their best condition obtained with 1 mm particle size and 90 days pretreatment. Further morphological study on rubberwood with 1 mm particle size pretreated by fungus was performed by FT-IR spectra analysis and SEM observation and the result indicated the ability of this fungus for pretreatment. A study on enzymatic hydrolysis resulted in an increased sugar yield of 27.67% as compared with untreated rubberwood (2.88%). The maximum ethanol concentration and yield were 17.9 g/L and 53% yield, respectively, after 120 hours. The results obtained demonstrate that rubberwood pretreated by C. subvermispora can be used as an alternative material for the enzymatic hydrolysis and bioethanol production.

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Biological pretreatment of rice straw by fermenting with Dichomitus squalens

Cited by 55 publications

References 48 publications

Lignocellulose depolymerization occurs via an environmentally adapted metabolic cascades in the wood‐rotting basidiomycete Phanerochaete chrysosporium

Lignocellulose depolymerization occurs via an environmentally adapted metabolic cascades in the wood‐rotting basidiomycete Phanerochaete chrysosporium

Complementary substrate‐selectivity of metabolic adaptive convergence in the lignocellulolytic performance by Dichomitus squalens

Biological Pretreatment of Rubberwood withCeriporiopsis subvermisporafor Enzymatic Hydrolysis and Bioethanol Production

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