Effects of biological pre-treatment of lignocellulosic waste with white-rot fungi on the stimulation of 14C-phenanthrene catabolism in soils

2021 ◽  
Vol 165 ◽  
pp. 105324
Author(s):  
Victor T. Omoni ◽  
Alfonso J. Lag-Brotons ◽  
Cynthia N. Ibeto ◽  
Kirk T. Semple
Keyword(s):  
White Rot Fungi ◽  
White Rot ◽  
Lignocellulosic Waste ◽  
Pre Treatment ◽  
Stimulation Of

scholarly journals Optimizing bio-physical conditions and pre-treatment options for breaking lignin barrier of maize stover feed using white rot fungi

2016 ◽  
Vol 2 (4) ◽  
pp. 361-369 ◽  
Author(s):  
Andrew M. Atuhaire ◽  
Fred Kabi ◽  
Samuel Okello ◽  
Swidiq Mugerwa ◽  
Cyprian Ebong
Keyword(s):  
Treatment Options ◽  
White Rot Fungi ◽  
White Rot ◽  
Maize Stover ◽  
Physical Conditions ◽  
Pre Treatment

scholarly journals Application of lignocellulolytic fungi for bioethanol production from renewable biomass

2015 ◽  
Vol 69 (6) ◽  
pp. 627-641 ◽  
Author(s):  
Jelena Jovic ◽  
Jelena Pejin ◽  
Suncica Kocic-Tanackov ◽  
Ljiljana Mojovic
Keyword(s):  
White Rot Fungi ◽  
Alcohol Oxidase ◽  
Brown Rot ◽  
White Rot ◽  
Lignocellulose Degradation ◽  
Bioethanol Production ◽  
Decay Fungi ◽  
Advantages And Disadvantages ◽  
Wide Range ◽  
Pre Treatment

Pretreatment is a necessary step in the process of conversion of lignocellulosic biomass to ethanol; by changing the structure of lignocellulose, enhances enzymatic hydrolysis, but, often, it consumes large amounts of energy and/or needs an application of expensive and toxic chemicals, which makes the process economically and ecologically unfavourable. Application of lignocellulolytic fungi (from the class Ascomycetes, Basidiomycetes and Deuteromycetes) is an attractive method for pre-treatment, environmentally friendly and does not require the investment of energy. Fungi produce a wide range of enzymes and chemicals, which, combined in a variety of ways, together successfully degrade lignocellulose, as well as aromatic polymers that share features with lignin. On the basis of material utilization and features of a rotten wood, they are divided in three types of wood-decay fungi: white rot, brown rot and soft rot fungi. White rot fungi are the most efficient lignin degraders in nature and, therefore, have a very important role in carbon recycling from lignified wood. This paper describes fungal mechanisms of lignocellulose degradation. They involve oxidative and hydrolytic mechanisms. Lignin peroxidase, manganese peroxidase, laccase, cellobiose dehydrogenase and enzymes able to catalyze formation of hydroxyl radicals (?OH) such as glyoxal oxidase, pyranose-2-oxidase and aryl-alcohol oxidase are responsible for oxidative processes, while cellulases and hemicellulases are involved in hydrolytic processes. Throughout the production stages, from pre-treatment to fermentation, the possibility of their application in the technology of bioethanol production is presented. Based on previous research, the advantages and disadvantages of biological pre-treatment are pointed out.

Impact of lignocellulosic waste-immobilised white-rot fungi on enhancing the development of 14C-phenanthrene catabolism in soil

2021 ◽  
pp. 152243
Author(s):  
Victor T. Omoni ◽  
Cynthia N. Ibeto ◽  
Alfonso J. Lag-Brotons ◽  
Paul O. Bankole ◽  
Kirk T. Semple
Keyword(s):  
White Rot Fungi ◽  
White Rot ◽  
Lignocellulosic Waste

scholarly journals The Impact of Substrate–Enzyme Proportion for Efficient Hydrolysis of Hay

Energies ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3526 ◽  
Author(s):  
Linda Mezule ◽  
Ieva Berzina ◽  
Martins Strods
Keyword(s):  
White Rot Fungi ◽  
Inhibitory Effect ◽  
White Rot ◽  
Alcohol Production ◽  
Commercial Enzyme ◽  
Loading Rates ◽  
Negative Effect ◽  
Pre Treatment ◽  
The Impact ◽  
Hydrolysis Of

Fuel alcohol production yields can be influenced by lignocellulosic biomass loading. High solid loadings (>20 wt%) are suggested to have the potential to produce more products. However, most often, low substrate loadings (<5% solids, w/w) are used to ensure good wetting and enzyme accessibility, and to minimize any inhibitory effect on the hydrolysis products. Here, we analyzed the effect of substrate loading on the enzymatic hydrolysis of hay with non-commercial enzyme products obtained from white-rot fungi. A significant negative effect on hydrolysis was observed when 10 wt% hay loading was used with the commercial enzyme, however, non-commercial enzyme products from white-rot fungi had no impact on hydrolysis in biomass loading rates from 1 to 10 wt%. Moreover, it was estimated that enzymes extracted from white-rot fungi could be used at a concentration of 0.2 FPU/mL at a biomass loading from 1–10 wt%, resulting in 0.17–0.24 g of released reducing carbohydrates per gram of biomass. Higher concentrations did not result in any significant conversion increase. A mixing impact was only observed in test runs at a substrate loading of 10 wt%. The apparently positive features of the non-commercial enzyme mixes give rise to their future use. The combination and upgrade of existing technologies, e.g., efficient pre-treatment, membrane purification, and concentration and efficient product recovery, should result in even higher conversion yields.

OPTIMIZATION OF BIOMASS AND ENDO-B-1,4-GLUCANASE BY WHITE ROT FUNGI NATIVE FROM ARGENTINA

2017 ◽  
Vol 16 (11) ◽  
pp. 2581-2588
Author(s):  
Ernesto M. Giorgio ◽  
Maria I. Fonseca ◽  
Andrea L. Morales ◽  
Pedro D. Zapata ◽  
Laura L. Villalba
Keyword(s):  
White Rot Fungi ◽  
White Rot

The Onset of Lignin-Modifying Enzymes, Decrease of AOX and Color Removal by White-Rot Fungi Grown on Bleach Plant Effluents

1991 ◽  
Vol 24 (3-4) ◽  
pp. 189-198 ◽  
Author(s):  
V. P. Lankinen ◽  
M. M. Inkeröinen ◽  
J. Pellinen ◽  
A. I. Hatakka
Keyword(s):  
Lignin Peroxidase ◽  
Active Form ◽  
White Rot Fungi ◽  
Pulp Mill ◽  
Color Removal ◽  
Effluent Treatment ◽  
White Rot ◽  
White Rot Fungus ◽  
Lignin Peroxidases ◽  
Pulp Mill Effluents

Decrease of adsorbable organic chlorine (AOX) is becoming the most important criterion for the efficiency of pulp mill effluent treatment in the 1990s. Two methods, designated MYCOR and MYCOPOR which utilize the white-rot fungus Phanerochaete chrysosporium have earlier been developed for the color removal of pulp mill effluents, but the processes have also a capacity to decrease the amount of chlorinated organic compounds. Lignin peroxidases (ligninases) produced by P. chrvsosporium may dechlorinate chlorinated phenols. In this work possibilities to use selected white-rot fungi in the treatment of E1-stage bleach plant effluent were studied. Phlebia radiata. Phanerochaete chrvsosporium and Merulius (Phlebia) tremellosus were compared in shake flasks for their ability to produce laccase, lignin peroxidase(s) and manganese-dependent peroxidase(s) and to remove color from a medium containing effluent. Softwood bleaching effluents were treated by carrier-immobilized P. radiata in 2 1 bioreactors and a 10 1 BiostatR -fermentor. Dechlorination was followed using Cl ion and AOX determinations. All fungi removed the color of the effluent. In P. radiata cultivations AOX decrease was ca. 4 mg l−1 in one day. Apparent lignin peroxidase activities as determined by veratryl alcohol oxidation method were negligible or zero in a medium with AOX content of ca. 60 mg l−1, prepared using about 20 % (v/v) of softwood effluent. However, the purification of extracellular enzymes implied that large amounts of lignin peroxidases were present in the medium and, after the purification, in active form. Enzyme proteins were separated using anion exchange chromatography, and they were further characterized by electrophoresis (SDS-PAGE) to reveal the kind of enzymes that were present during AOX decrease and color removal. The most characteristic lignin peroxidase isoenzymes in effluent media were LiP2 and LiP3.

Revalorizing Lignocellulose for the Production of Natural Pharmaceuticals and Other High Value Bioproducts

2019 ◽  
Vol 26 (14) ◽  
pp. 2475-2484 ◽  
Author(s):  
Congqiang Zhang ◽  
Heng-Phon Too
Keyword(s):  
Clostridium Thermocellum ◽  
White Rot Fungi ◽  
Brown Rot ◽  
Cost Effective ◽  
White Rot ◽  
Chemical Pretreatment ◽  
Significant Challenge ◽  
Drug Molecules ◽  
Natural Medicine ◽  
Renewable Natural Resource

Lignocellulose is the most abundant renewable natural resource on earth and has been successfully used for the production of biofuels. A significant challenge is to develop cost-effective, environmentally friendly and efficient processes for the conversion of lignocellulose materials into suitable substrates for biotransformation. A number of approaches have been explored to convert lignocellulose into sugars, e.g. combining chemical pretreatment and enzymatic hydrolysis. In nature, there are organisms that can transform the complex lignocellulose efficiently, such as wood-degrading fungi (brown rot and white rot fungi), bacteria (e.g. Clostridium thermocellum), arthropods (e.g. termite) and certain animals (e.g. ruminant). Here, we highlight recent case studies of the natural degraders and the mechanisms involved, providing new utilities in biotechnology. The sugars produced from such biotransformations can be used in metabolic engineering and synthetic biology for the complete biosynthesis of natural medicine. The unique opportunities in using lignocellulose directly to produce natural drug molecules with either using mushroom and/or ‘industrial workhorse’ organisms (Escherichia coli and Saccharomyces cerevisiae) will be discussed.

Bacterial Community Coexisting with White-Rot Fungi in Decayed Wood in Nature

2021 ◽  
Author(s):  
Yosuke Iimura ◽  
Hisashi Abe ◽  
Yuichiro Otsuka ◽  
Yuya Sato ◽  
Hiroshi Habe
Keyword(s):  
Bacterial Community ◽  
White Rot Fungi ◽  
White Rot ◽  
Decayed Wood
Sign in / Sign up

Export Citation Format

Share Document