Microbial valorization of lignin: Prospects and challenges

Reshmy, R.; Balakumaran, Palanisamy Athiyaman; Divakar, K.; Philip, Eapen; Madhavan, Aravind; Pugazhendhi, Arivalagan; Sirohi, Ranjna; Binod, Parameswaran; Awasthi, Mukesh Kumar; Sindhu, Raveendran

doi:10.1016/j.biortech.2021.126240

Cited by 65 publications

(25 citation statements)

References 120 publications

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“…Significant reductions in molecule numbers were also observed for tannins, proteins, aromatics, and carbohydrates. However, the number of molecules with low O/C and high H/C (lipids) increased, suggesting poor biological degradation of pre-existing lipids or/and the production of lipids via microbial activities . From the perspective of element composition, molecules that only contained C, H, and O elements accounted for 40% of the total molecule numbers in raw water, which increased to 59 and 68% after NBAC and ABAC treatment, respectively (Figure C).…”

Section: Resultsmentioning

confidence: 99%

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Liu

Graham

et al. 2023

Environ. Sci. Technol.

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The biodegradation in the middle and downstream of slow-rate biological activated carbon (BAC) is limited by insufficient dissolved oxygen (DO) concentrations. In this study, a bubbleless aerated BAC (termed ABAC) process was developed by installing a hollow fiber membrane (HFM) module within a BAC filter to continuously provide aeration throughout the BAC system. The BAC filter without an HFM was termed NBAC. The laboratory-scale ABAC and NBAC systems operated continuously for 426 days using secondary sewage effluent as an influent. The DO concentrations for NBAC and ABAC were 0.78 ± 0.27 and 4.31 ± 0.44 mg/L, respectively, with the latter providing the ABAC with greater electron acceptors for biodegradation and a microbial community with better biodegradation and metabolism capacity. The biofilms in ABAC secreted 47.3% less EPS and exhibited greater electron transfer capacity than those in NBAC, resulting in enhanced contaminant degradation efficiency and long-term stability. The extra organic matter removed by ABAC included refractory substances with a low elemental ratio of oxygen to carbon (O/C) and a high elemental ratio of hydrogen to carbon (H/C). The proposed ABAC filter provides a valuable, practical example of how to modify the BAC technology to shape the microbial community, and its activity, by optimizing the ambient atmosphere.

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Section: Resultsmentioning

confidence: 99%

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Liu

Graham

et al. 2023

Environ. Sci. Technol.

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“…), are predominant oxidases that can directly depolymerize lignin. Although LDAs cannot directly depolymerize lignin, they can assist LMEs in the degradation of lignin ( Reshmy et al, 2022 ). Unlike fungal lignin-depolymerizing oxidases, bacterial lignin depolymerization is dominated by laccase and DyP (Dye decolorizing peroxidase) ( de Gonzalo et al, 2016 ).…”

Section: Bio-depolymerization Of Lignin To Aromatic Compoundsmentioning

confidence: 99%

“…As attractive feedstocks for biofuel production, lipids can be synthesized from lignin-based aromatic building blocks by oleaginous microorganisms with nearly 20% of lipids accumulation out of their dry cell weight (DCW) ( Reshmy et al, 2022 ). Prominent oleaginous bacteria can exhibit excellent lipid accumulation capacities, such as Acinetobacter calcoaceticus (lipid accumulation up to 27%–38% of their DCW), Rhodococcus opacus (25%), and Bacillus alcalophilus (18%–24%) ( Iram et al, 2021 ).…”

Section: Bio-conversion Of Lignin To Lipidsmentioning

confidence: 99%

Recent Biotechnology Advances in Bio-Conversion of Lignin to Lipids by Bacterial Cultures

Wang

Peng

et al. 2022

Front. Chem.

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The complexity and recalcitrance of the lignin structure is a major barrier to its efficient utilization and commercial production of high-value products. In recent years, the “bio-funneling” transformation ability of microorganisms has provided a significant opportunity for lignin conversion and integrated biorefinery. Based on the chemical structure of lignin, this mini-review introduces the recent advances of lignin depolymerization by bacterial strains and the application of microbial lignin degradation in lipids production. Furthermore, the current challenges, future trends and perspectives for microbe-based lignin conversion to lipids are discussed.

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“…The contribution of plant lignin to soil humification is presumably significant, but it is still questionable whether microbial metabolism of lignin is essential for displaying plant-stimulatory activities of HSs. Microbial metabolites of lignin have been investigated, and key enzymatic reactions are suggested ( 15 – 17 ), but to our best knowledge, it appears that no clear connection between microbial metabolism-driven lignin structural modifications and plant-stimulatory activities has so far been reported. Since direct plant stimulation capacity is one of the main features of soil HSs, the connection must be proven for fully rationalizing the notion that lignin is the origin of HSs.…”

Section: Introductionmentioning

confidence: 99%

Lignin Metabolism by Selected Fungi and Microbial Consortia for Plant Stimulation: Implications for Biologically Active Humus Genesis

et al. 2022

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Structurally stable humic substances (HSs) in soils are tightly associated with soil fertility, and it is thus important to understand how soil HSs are naturally formed. It is believed that microbial metabolism on plant matter contributes to natural humification, but detailed microbial species and their metabolisms inducing humic functionality (e.g., direct plant stimulation) need to be further investigated.

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Microbial valorization of lignin: Prospects and challenges

Cited by 65 publications

References 120 publications

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Bubbleless Air Shapes Biofilms and Facilitates Natural Organic Matter Transformation in Biological Activated Carbon

Recent Biotechnology Advances in Bio-Conversion of Lignin to Lipids by Bacterial Cultures

Lignin Metabolism by Selected Fungi and Microbial Consortia for Plant Stimulation: Implications for Biologically Active Humus Genesis

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