Biomass to value-added products using microbial consortia with white-rot fungi

González, Camila; Wu, Yonggang; Zuleta-Correa, Ana; Jaramillo, Glorimar; Vasco‐Correa, Juliana

doi:10.1016/j.biteb.2021.100831

Cited by 14 publications

(6 citation statements)

References 111 publications

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“…Notably, the cellulose content of WSI-50% was significantly lower than that of EWSI but the lignin content of WSI-50% was higher. The co-culture of some microorganisms with WRF is reported to increase the activities of cellulase, xylose, and chitinase [ 8 ]. Combined with the higher counts of other microorganisms, we inferred that their existence promoted the degradation of cellulose and other nutrients, increasing the relative content of lignin.…”

Section: Resultsmentioning

confidence: 99%

“…WRF is a type of filamentous fungi that causes the white rot of wood due to their better ability to degrade lignin than that of cellulose, so WRF has potential applications in the pretreatment of lignocellulose [ 6 , 7 , 8 ]. WRF, such as Irpex lacteus , Lentinus edodes, and Ceriporiopsis subvermispora , is effective in selectively degrading lignin [ 2 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Ensiling Improved the Colonization and Degradation Ability of Irpex lacteus in Wheat Straw

Niu

Zhu

Pan

et al. 2022

IJERPH

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To develop a non-thermal method to replace steam autoclaving for white-rot fungi fermentation, Irpex lacteus spawn was inoculated in wheat straw (WSI) or ensiled WS (WSI) at varying ratios of 10%, 20%, 30%, 40%, and 50%, and incubated at 28 °C for 28 days to determine the effects of the ensiling and inoculation ratio on the colonization and degradation ability of Irpex lacteus in wheat straw (WS). The results demonstrate that ensiling effectively inhibited the growth of aerobic bacteria and molds, as well as other harmful microorganisms in WS, which created a favorable condition for the growth of I. lacteus. After the treatment of I. lacteus, the pH of EWSI decreased to below 5, while that of WSI, except for the feedstocks of WSI-50%, was around 7, indicating that I. lacteus colonized well in the ensiled WS because the substrates dominated by I. lacteus are generally acidic. Correspondingly, except for the molds in WSI-50% samples, the counts of other microorganisms in WSI, such as aerobic bacteria and molds, were significantly higher than those in EWSI (p < 0.05), indicating that contaminant microorganisms had a competitive advantage in non-ensiled substrates. Incubation with I. lacteus did not significantly affect the cellulose content of all samples. However, the NDS content of EWSI was significantly higher than that of WSI (p < 0.05), and the hemicellulose and lignin contents were significantly lower than the latter (p < 0.05), except for the NDS and hemicellulose contents of WSI-50% samples. Correlation analysis revealed a stronger negative correlation between NDS content and the contents of hemicellulose, cellulose, and lignin in EWSI, which could be caused by the destruction of lignin and hemicellulose and the conversion from structural carbohydrates to fungal polysaccharides or other compounds in NDS form. Even for WSI-50% samples, the sugar yield of WS treated with I. lacteus improved with an increasing inoculation ratio, but the ratio was not higher than that of the raw material. However, the sugar yield of EWSI increased by 51–80%, primarily owing to the degradation of lignin and hemicellulose. Above all, ensiling improves the colonization ability of I. lacteus in WS, which promotes the degradation of lignin and hemicellulose and the enzymic hydrolysis of cellulose, so combining ensiling and I. lacteus fermentation has promising potential in the pretreatment of WS.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ensiling Improved the Colonization and Degradation Ability of Irpex lacteus in Wheat Straw

Niu

Zhu

Pan

et al. 2022

IJERPH

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“…MCons pretreatment approach requires the utilization of mixed microbes, commonly selected from ecological niches such as soil, herbivore's gut, livestock dung, and biogas slurry, where they form communities or ‘guilds’ that synergistically degrade complex substrates [ 184 ]. The use of microbial consortia, whether natural or synthetic (genetically engineered), represents a more effective and successful alternative for degrading lignocelluloses compared to single strains, as monocultures are more sensitive to environmental fluctuations and have limited metabolic and degrading capabilities [ 185 , 186 ]. Zhong et al [ 187 ] showed that pretreatment of pig manure and rice straw with cellulolytic microflora, including Clostridium, Petrobacter, Defluviitalea, and Paenibacillus, enhanced the cumulative methane production by 45% and reduced the lag phase from 2.43 to 1.79 days.…”

Section: Pretreatment Approaches Of Agricultural Biomassmentioning

confidence: 99%

Valorization of crop residues and animal wastes: Anaerobic co-digestion technology

Adnane,

Taoumi,

Elouahabi

et al. 2024

Heliyon

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“…In the cells of P. chrysosporium and other white-rot fungi, a wide variety of metabolic pathways take place simultaneously, e.g., glycolysis, pentose-phosphate pathway, tricarboxylic acid (TCA) cycle, which are all essential for the growth and functionality of fungal cells. Glycolytic pathways, together with the TCA cycle, produce the oxidation of carbohydrates, fatty acids, and amino acids, forming high-energy molecules, e.g., adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide (NADPH), which support the formation of proteins and act as energy storage for the fungal cells [42]. Figure 7 shows the role of the principal metabolic pathways in P. chrysosporium cells.…”

Section: Evaluation Of Corn Steep As a CM Componentmentioning

confidence: 99%

Assessment of Modified Culture Conditions for Fungal Bio-Oxidation of Sulfidic Gold Ores Performed at Circumneutral pH

Hein,

Mahandra,

Ghahreman

2023

Sustainability

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The significant neutralization of waste streams required after the acidic bio-oxidation of sulfidic gold ores could be avoided by performing a novel treatment at circumneutral pH with an in situ neutralization. For the first time, the white-rot fungus Phanerochaete chrysosporium was incubated in a modified culture medium containing corn steep, an industrial waste product, to support microbial activity and, subsequently, the oxidation of a sulfidic ore at an initial circumneutral pH environment. In this investigation, the concentration of the native culture medium ingredients was first evaluated with response surface methodology to attain maximum sulfide oxidation. The statistical analysis proposed a modified culture medium composed of 12.86 g/L glucose, 2.20 g/L malt extract, 1.67 g/L yeast extract, and 0.49 g/L MgSO4·7H2O to reach a maximum of 28.7% sulfide oxidation after 14 d-bio-oxidation. pH-controlled batch cultures showed that an increase in initial pH in the range of 5.8 to 7.0 reduced the microbial activity, affecting sulfide oxidation. In addition, the modified culture medium at which yeast extract was substituted with 1.67 g/L corn steep produced comparable microbial activity and sulfide oxidation after 14 d, attaining 21.6% at 5% w/v with a maximum 39 U/L lignin peroxidase and 116 U/L manganese peroxidase. A 40.6% sulfide oxidation and 43.8% gold recovery were obtained after 42 d three-cycle replenishing bio-oxidation and 24 h cyanidation, respectively. Overall, corn steep waste showed the potential to substitute more expensive culture medium ingredients, supporting microbial activity and oxidation of sulfidic gold ores at an initial circumneutral pH and contributing to circularity of waste management.

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Biomass to value-added products using microbial consortia with white-rot fungi

Cited by 14 publications

References 111 publications

Ensiling Improved the Colonization and Degradation Ability of Irpex lacteus in Wheat Straw

Ensiling Improved the Colonization and Degradation Ability of Irpex lacteus in Wheat Straw

Valorization of crop residues and animal wastes: Anaerobic co-digestion technology

Assessment of Modified Culture Conditions for Fungal Bio-Oxidation of Sulfidic Gold Ores Performed at Circumneutral pH

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