Lignocellulose degradation patterns, structural changes, and enzyme secretion by Inonotus obliquus on straw biomass under submerged fermentation

Xu, Xin; Xu, Zhiqi; Shi, Song; Lin, Mengmeng

doi:10.1016/j.biortech.2017.05.087

Cited by 94 publications

(56 citation statements)

References 37 publications

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“…The chemical structure was analyzed using the KBr pellet technique with spectra obtained ranging from 2000 to 500 cm −1 using a Nicolet 5700 FTIR (Thermo Electron Corporation, NY, USA). Omnic software was used to determine peak height and area of spectra 3 …”

Section: Methodsmentioning

confidence: 99%

“…The surface properties and microstructure were observed using SEM. WS samples before and after treatment with I. obliquus were dried at 105 °C, sliced and plated with gold, and observed using a JSM‐5610LV scanning electron microscope (Jeol Ltd, Tokyo, Japan) 3 …”

Section: Methodsmentioning

confidence: 99%

“…Previously, we reported that I. obliquus as a white rot fungus had the ability to degrade lignocellulosic residues under submerged fermentation 3 and accumulated antioxidant phenolic compounds with wheat straw (WS) biodegradation 4,5 . It was hypothesized that some phenolic compounds like phenolic acids might be the lignin‐derived phenols, 6,7 but polyphenols including flavonoids were probably produced by the mushroom via bioconversion of the lignin degradation products under oxidative stress during WS degradation 6,8,9 .…”

Section: Introductionmentioning

confidence: 99%

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Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

et al. 2020

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BACKGROUNDThis study investigated the effect of surfactants on wheat straw biodegradation and the growth‐associated generation of exo‐ and endo‐phenolic compounds (EPC and IPC) and antioxidant activity expression by liquid‐cultured Inonotus obliquus, an edible and medicinal mushroom, also known as a white rot fungus. Changes in the chemical composition and multiscale structure of wheat straw, in the production and activity of EPC and IPC and in individual flavonoids were analyzed.RESULTSFungal pretreatment decreased significantly the contents of all lignocellulose components, increased and enlarged substrate porosity and caused changes in the structure of wheat straw with the aid of Triton X‐100. A gradual increase in EPC and IPC production was observed up to 6.4‐ and 1.5‐fold for 9 days. The EPC obtained on day 9 showed the highest antioxidant activity (IC50 of 30.96 mg L−1) against 2,2‐diphenyl‐1‐picrylhydrazyl radicals. High‐performance liquid chromatographic results indicated the presence of high amounts of epicatechin‐3‐gallate (ECG; (374.9 mg g−1) and epigallocatechin‐3‐gallate (EGCG; 447.2 mg g−1) in the EPC; other polyphenols were also enhanced but to a lesser extent. Surfactant supplementation was effective in enhancing flavonoid production and in increasing antioxidant activity in EPC.CONCLUSIONSThe results indicated enhanced accumulation of phenolic compounds, particularly ECG and EGCG in Inonotus obliquus via biodegradation and bioconversion of lignocellulose residues. They also indicated enhancement in the production of several flavonoids and also an increase in antioxidant activity in the product by a surfactant‐treated process, which may be a useful way of exploiting underused lignocellulosic residues to various high‐added‐value functional ingredients. © 2020 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

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“…Xu et al [23] reported that within 12 days of pretreatment, the highest lignin loss achieved by medicinal mushroom, Inonotus obliquus, using wheat straw as substrate is at 72%, with cellulose loss of 55%. However, lower delignification was observed for corn stover and rice straw of 47 and 39% with cellulose reduction of 55 and 45%.…”

Section: Pretreatment Of Lignocelluloses With White-rot Fungimentioning

confidence: 99%

Fungal Pretreatment of Lignocellulosic Materials

Nadir¹,

Ismail²,

Hussain³

2019

Biomass for Bioenergy - Recent Trends and Future Challenges

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The biomass must be converted to fermentable carbohydrates through pretreatment process to break down the complex structure to its constituents prior to fermentation. For lignocellulosic materials, lignin moiety is extremely resistant to degradation because of hydrogen bond cross-linking between the cellulose and hemicellulose. Biological pretreatment using white-rot fungi are novel method and environmental-friendly as a method of biomass deconstruction as compared to other conventional means. These fungi can excrete ligninolytic enzymes to degrade lignin although the rate of deconstruction is slow. Hence, this chapter will focus on the fungal pretreatment or delignification process using white-rot fungi as it is an important step to increase the feedstock conversion.

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“…Typical Comparisons of the strengths and weaknesses of the different pretreatment methods used for lignocellulosic biofuels production (Kumar et al, 2019; Menon et al, 2012, Jędrzejczyk et al, 2019).enzymes include phenol oxidase, lignin peroxidase, versatile peroxidase, and manganese peroxidase. Simultaneous degradation and fermentation of lignocellulosic biomass by these microorganisms could lead to the formation of various biofuels (including ethanol, hydrogen, and methane) and biomaterials (such as various enzymes, lactates, acetates, and organic acids)Xu et al, 2017).…”

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Pretreatment methods for lignocellulosic biofuels production: current advances, challenges and future prospects

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Keywords:Lignocellulosic biomass has been recognized as promising feedstock for biofuels production. However, the high cost of pretreatment is one of the major challenges hindering large-scale production of biofuels from these abundant, indigenouslyavailable, and economic feedstock. In addition to high capital and operation cost, high water consumption is also regarded as a challenge unfavorably affecting the pretreatment performance. In the present review, advances in lignocellulose pretreatment technologies for biofuels production are reviewed and critically discussed. Moreover, the challenges faced and future research needs are addressed especially in optimization of operating parameters and assessment of total cost of biofuel production from lignocellulose biomass at large scale by using different pretreatment methods. Such information would pave the way for industrial-scale lignocellulosic biofuels production. Overall, it is important to ensure that throughout lignocellulosic bioethanol production processes, favorable features such as maximal energy saving, waste recycling, wastewater recycling, recovery of materials, and biorefinery approach are considered.

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Lignocellulose degradation patterns, structural changes, and enzyme secretion by Inonotus obliquus on straw biomass under submerged fermentation

Cited by 94 publications

References 37 publications

Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

Production of phenolic compounds and antioxidant activity via bioconversion of wheat straw by Inonotus obliquus under submerged fermentation with the aid of a surfactant

Fungal Pretreatment of Lignocellulosic Materials

Pretreatment methods for lignocellulosic biofuels production: current advances, challenges and future prospects

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