scholarly journals Comparative Study on Quality of Fuel Pellets from Switchgrass Treated with Different White-Rot Fungi

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7670
Author(s):  
Onu Onu Olughu ◽  
Lope G. Tabil ◽  
Tim Dumonceaux ◽  
Edmund Mupondwa ◽  
Duncan Cree
Keyword(s):  
Tensile Strength ◽  
Trametes Versicolor ◽  
Positive Impact ◽  
White Rot Fungi ◽  
Fold Increase ◽  
White Rot ◽  
Fermentation Time ◽  
Fungal Strains ◽  
Particle Bonding ◽  
Fungal Pretreatment

Fungal pretreatment of switchgrass using Phanerochaete chrysosporium (PC), Trametes versicolor 52J (TV52J), and the Trametes versicolor mutant strain (m4D) under solid-state fermentation was conducted to improve its pellet quality. For all three fungal strains, the fermentation temperature had a significant effect (p < 0.05) on pellet unit density and tensile strength. The p-values of the quadratic models for all the response variables showed highly significant regression models (p < 0.01) except for dimensional stability. In addition, 3.1-fold and 2.8-fold increase in pellet tensile strength were obtained from P. chrysosporium- and T. versicolor 52J-treated materials, respectively. Microstructural examination showed that fungal pretreatment reduced pores in the pellets and enhanced pellet particle bonding. Among the fungal strains, PC had the shortest optimum fermentation time (21 d) and most positive impact on the pellet tensile strength and hydrophobicity. Therefore, switchgrass pretreatment using PC has the potential for resolving the challenges of switchgrass pellet transportation and storage and reducing the overall pelletization cost. However, a detailed comparative technoeconomic analysis would be required to make definitive cost comparisons.

Ability of white-rot fungi to remove selected pharmaceuticals and identification of degradation products of ibuprofen by Trametes versicolor

Chemosphere ◽  
2009 ◽  
Vol 74 (6) ◽  
pp. 765-772 ◽  
Author(s):  
Ernest Marco-Urrea ◽  
Miriam Pérez-Trujillo ◽  
Teresa Vicent ◽  
Gloria Caminal
Keyword(s):  
Trametes Versicolor ◽  
Degradation Products ◽  
White Rot Fungi ◽  
White Rot

scholarly journals Biological pretreatment of wheat straw: Effect of fungal culturing on enzymatic hydrolysis of carbohydrate polymers

2021 ◽  
Author(s):  
Aleksandar Knežević ◽  
Ivana Đokić ◽  
Tomislav Tosti ◽  
Slađana Popović ◽  
Dušanka Milojković-Opsenica ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Wheat Straw ◽  
Lignin Degradation ◽  
Enzymatic Saccharification ◽  
White Rot Fungi ◽  
Fungal Species ◽  
White Rot ◽  
Irpex Lacteus ◽  
Fungal Pretreatment ◽  
Hydrolysis Of

Abstract The aim of the study was comparative analysis of degradation of wheat straw lignin by white-rot fungi and its implications on the efficiency of enzymatic hydrolysis of holocellulose. Cyclocybe cylindracea, Ganoderma resinaceum, Irpex lacteus, Pleurotus ostreatus and Trametes versicolor were the species studied. Peroxidases were predominantly responsible for lignin degradation even though high laccase activities were detected, except in the case of Irpex lacteus where laccase activity was not detected. Studied fungal species showed various ability to degrade lignin in wheat straw which further affected release of reducing sugars during enzymatic saccharification. The highest rate of lignin degradation was noticed in sample pretreated with Irpex lacteus (50.9 ± 4.1%). Among all tested species only Ganoderma resinaceum was suitable lignin degrader with the 2-fold higher hydrolysis yield (51.1 ± 4.7%) than in the control, and could have significant biotechnological application due to lower cellulose loss. A key mechanism of carbohydrate component convertibility enhancement was lignin removal in the biomass. Long time consumption, the low sugar yields and unpredictable fungal response still remain the challenge of the fungal pretreatment process.

scholarly journals PSXIV-14 Evaluation of 21 fungal strains as pretreatment of corn stover: chemical composition and in vitro digestibility

2019 ◽  
Vol 97 (Supplement_3) ◽  
pp. 444-444
Author(s):  
Paulina Luna Moreno ◽  
Hermilo Leal-Lara ◽  
Águeda García-Pérez ◽  
Luis Corona ◽  
Atmir Romero-Pérez ◽  
...  
Keyword(s):  
Corn Stover ◽  
Lentinula Edodes ◽  
White Rot Fungi ◽  
Neutral Detergent Fiber ◽  
White Rot ◽  
In Vitro Digestibility ◽  
Edible Fungi ◽  
Fungal Strains ◽  
Dry Matter Digestibility

Abstract Agricultural by-products such as corn stover (CS) are abundantly available in many countries; however, its high content of neutral detergent fiber (NDF) and lignin (L) and low protein content, causes low digestibility and nutrient availability for ruminants. The production of edible fungi could improve the digestibility of the CS because fungi can break down the cross-links between cell wall components. The aim of the study was to evaluate the effect of the invaded CS-based substrate used in the production of 21 white rot fungi of the species: Auricularia sp (Auri), Ganoderma sp (Gano), Hericium sp (Heri), Lentinula edodes (LC, L5, L9, L15, L21), Pleurotus eryngii (Pe-PQ, Pe-MB), Pleurotus djamour (Pd-Pro, Pd-UTMR) and Pleurotus ostreatus (Po-IAP, Po-Psma, Po-P14, Po-POS, Po-IE202, Po-JP, Po-P35, Po-P38, Po-Sfco) on crude protein (CP), NDF and L content and in vitro dry matter digestibility (IVDMD). The variables were analyzed in a completely randomized design with the MIXED procedure of SAS and the comparison of the means was made with the Tukey analysis. For CP, a significant increase (P &lt; 0.05) was observed from 10% (Pe-MB) to 41% (LC) in comparison with the substrate without inoculation (C). There was a decrease (P &lt; 0.05) of NDF from 2% (LC) to 10% (Pd-PRO) against C. Fungal treated CS had no effect on L (P &lt; 0.05) as compared to C. Treatments increased (P &lt; 0.05) IVDMD from 3% (L15) up to 36% (Po-POS) for all fungal strains, except for Pe-PQ and Po-Sfco in comparison with C. There was a positive correlation (r2=0.21, P &lt; 0.05) between CP and IVDMD. An equation was obtained to predict IVDMD [IVDMD=0.40578 + 358.38(%ADF)–358.02(%NDF)+358.17(%HEM)–0.3211(%DM), R2=0.32 (P &lt; 0.05)]. In conclusion the mycelial invasion of white rot fungi on a CS-based substrate, increased CP content, decreased NDF and improved IVDMD, making it a viable option to increase the digestibility of CS.

Synergistic effect of mixed fungal pretreatment on thermogravimetric characteristics of rice straw

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 3978-3990
Author(s):  
Meng Li ◽  
Zhinan Wang ◽  
Jin Sun ◽  
Wanjuan Chen ◽  
Xianfeng Hu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Rice Straw ◽  
Chemical Characterization ◽  
White Rot Fungi ◽  
Brown Rot ◽  
White Rot ◽  
Thermochemical Conversion ◽  
Brown Rot Fungi ◽  
Fungal Pretreatment ◽  
Before And After

The thermogravimetric properties and chemical characterization of rice straw (RS) pretreated by mixed culture of white-rot fungi Phanerochaete chrysosporium (P. chrysosporium) and brown-rot fungi Gloeophyllum trabeum (G. trabeum) were investigated. The mixed fungal pretreatment showed a synergistic effect, which resulted in an energy-efficient pyrolysis of pretreated rice straw. The differences in thermochemical conversion of rice straw before and after fungal pretreatment were investigated using thermogravimetric analysis and the Flynn–Wall–Ozawa (FWO) method. Furthermore, the pretreated samples were also analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) to illuminate the changes in chemical composition and pyrolysis behavior. Compared to single fungal pretreatment, the mixed fungal pretreatment worked better and exhibited great potential in biomass pyrolysis.

scholarly journals Enhancing the Production of Hydroxyl Radicals by Pleurotus eryngii via Quinone Redox Cycling for Pollutant Removal

2009 ◽  
Vol 75 (12) ◽  
pp. 3954-3962 ◽  
Author(s):  
Víctor Gómez-Toribio ◽  
Ana B. García-Martín ◽  
María J. Martínez ◽  
Ángel T. Martínez ◽  
Francisco Guillén
Keyword(s):  
Fenton Reaction ◽  
White Rot Fungi ◽  
Fold Increase ◽  
Redox Cycling ◽  
Pleurotus Eryngii ◽  
Pollutant Removal ◽  
White Rot ◽  
Reactive Black 5 ◽  
Pollutant Degradation ◽  
Enhanced Production

ABSTRACT The induction of hydroxyl radical (OH) production via quinone redox cycling in white-rot fungi was investigated to improve pollutant degradation. In particular, we examined the influence of 4-methoxybenzaldehyde (anisaldehyde), Mn2+, and oxalate on Pleurotus eryngii OH generation. Our standard quinone redox cycling conditions combined mycelium from laccase-producing cultures with 2,6-dimethoxy-1,4-benzoquinone (DBQ) and Fe3+-EDTA. The main reactions involved in OH production under these conditions have been shown to be (i) DBQ reduction to hydroquinone (DBQH2) by cell-bound dehydrogenase activities; (ii) DBQH2 oxidation to semiquinone (DBQ−) by laccase; (iii) DBQ− autoxidation, catalyzed by Fe3+-EDTA, producing superoxide (O2 −) and Fe2+-EDTA; (iv) O2 − dismutation, generating H2O2; and (v) the Fenton reaction. Compared to standard quinone redox cycling conditions, OH production was increased 1.2- and 3.0-fold by the presence of anisaldehyde and Mn2+, respectively, and 3.1-fold by substituting Fe3+-EDTA with Fe3+-oxalate. A 6.3-fold increase was obtained by combining Mn2+ and Fe3+-oxalate. These increases were due to enhanced production of H2O2 via anisaldehyde redox cycling and O2 − reduction by Mn2+. They were also caused by the acceleration of the DBQ redox cycle as a consequence of DBQH2 oxidation by both Fe3+-oxalate and the Mn3+ generated during O2 − reduction. Finally, induction of OH production through quinone redox cycling enabled P. eryngii to oxidize phenol and the dye reactive black 5, obtaining a high correlation between the rates of OH production and pollutant oxidation.

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