A Review on The Bioconversion of Lignin to Microbial Lipid with Oleaginous Rhodococcus opacus

Mahan, Kristina M.; Le, Rosemary K.; Yuan, Joshua S.; Ragauskas, Arthur J.

doi:10.4172/2155-952x.1000262

Cited by 26 publications

(9 citation statements)

References 68 publications

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“…The application of lignocellulosic fibers in bioplastics has been investigated in several studies which mainly focus on cellulose fiber. Several reviews published recently can provide the readers with more detailed information [11,136]. Unmodified fibers can serve as a cheaper material compared to cellulose modification, therefore, the application of raw lignocellulosic fibers in bioplastics has attained more attentions in recent years [11].…”

Section: Application Of Lignocellulosic Fibers In Bioplasticsmentioning

confidence: 99%

Applications of Lignocellulosic Fibers and Lignin in Bioplastics: A Review

2019

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Lignocellulosic fibers and lignin are two of the most important natural bioresources in the world. They show tremendous potential to decrease energy utilization/pollution and improve biodegradability by replacing synthetic fibers in bioplastics. The compatibility between the fiber-matrix plays an important part in the properties of the bioplastics. The improvement of lignocellulosic fiber properties by most surface treatments generally removes lignin. Due to the environmental pollution and high cost of cellulose modification, focus has been directed toward the use of lignocellulosic fibers in bioplastics. In addition, lignin-reinforced bioplastics are fabricated with varying success. These applications confirm there is no need to remove lignin from lignocellulosic fibers when preparing the bioplastics from a technical point of view. In this review, characterizations of lignocellulosic fibers and lignin related to their applications in bioplastics are covered. Then, we generalize the developments and problems of lignin-reinforced bioplastics and modification of lignin to improve the interaction of lignin-matrix. As for lignocellulosic fiber-reinforced bioplastics, we place importance on the low compatibility of the lignocellulosic fiber–matrix. The applications of lignin-containing cellulose and lignocellulosic fibers without delignification in the bioplastics are reviewed. A comparison between lignocellulosic fibers and lignin in the bioplastics is given.

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Section: Application Of Lignocellulosic Fibers In Bioplasticsmentioning

confidence: 99%

Applications of Lignocellulosic Fibers and Lignin in Bioplastics: A Review

2019

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“…Generally, oleaginous organisms can accumulate > 20% of their dry cell weight (DCW) as lipids. In recent years, researchers found that some oleaginous microbes can synthesize lipid from lignin-based aromatics and Rhodococcus is such a promising species among these microbes, because of its robust growth, tolerance to various aromatics, broad substrate specificity, as well as robust lipid production capability [96, 97]. As mentioned in the “Degradation pathways of lignin-based aromatics in bacteria”, Rhodococcus bacteria can metabolize various lignin-based aromatics.…”

Section: Application Of Multiple Metabolic Pathways For Lignin Valorimentioning

confidence: 99%

Recent advances in lignin valorization with bacterial cultures: microorganisms, metabolic pathways, and bio-products

Lei²,

Zhai

et al. 2019

Biotechnol Biofuels

211

119

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Lignin is the most abundant aromatic substrate on Earth and its valorization technologies are still under developed. Depolymerization and fragmentation are the predominant preparatory strategies for valorization of lignin to chemicals and fuels. However, due to the structural heterogeneity of lignin, depolymerization and fragmentation typically result in diverse product species, which require extensive separation and purification procedures to obtain target products. For lignin valorization, bacterial-based systems have attracted increasing attention because of their diverse metabolisms, which can be used to funnel multiple lignin-based compounds into specific target products. Here, recent advances in lignin valorization using bacteria are critically reviewed, including lignin-degrading bacteria that are able to degrade lignin and use lignin-associated aromatics, various associated metabolic pathways, and application of bacterial cultures for lignin valorization. This review will provide insight into the recent breakthroughs and future trends of lignin valorization based on bacterial systems.

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“…121 Kosa Using fed-batch fermentation of T. cutaneum, these researchers increased the cell density from 2.4 to 5.1 g/L and the final lipid concentration reached 0.85 g/L compared to 0.4 g/L in batch mode. Extensive studies have proven that Rhodococcus species can grow on lignin materials, including aromatic compounds, technical lignin, and lignocellulose to accumulate lipid.…”

Section: Microbial Lipidsmentioning

confidence: 99%

“…Extensive studies have proven that Rhodococcus species can grow on lignin materials, including aromatic compounds, technical lignin, and lignocellulose to accumulate lipid. 121 Kosa and Ragauskas 98 explored two strains of R. opacus DSM 1069 and R. opacus PD 630 on their abilities of using lignin model compounds, and the researchers showed that these two strains were able to grow on 4-hydroxybenzoic acid and vanillic acid at the concentration 0.5% The mutant strain, Amycolatopsis sp MA-2, generated from muconate cycloisomerases gene deletion, accumulated 3.1 g/L muconic acid from guaiacol within 24 hr, achieving a yield of 96%; MA-2 also produced 1.0 mM muconic acid from pine lignin hydrolysate within 10 hr with a molar yield of 72%.…”

Section: Microbial Lipidsmentioning

confidence: 99%

Biotransformation of lignin: Mechanisms, applications and future work

Zheng

2019

Biotechnology Progress

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As one of the most abundant polymers in biosphere, lignin has attracted extensive attention as a kind of promising feedstock for biofuel and bio-based products. However, the utilization of lignin presents various challenges in that its complex composition and structure and high resistance to degradation. Lignin conversion through biological platform harnesses the catalytic power of microorganisms to decompose complex lignin molecules and obtain value-added products through biosynthesis.Given the heterogeneity of lignin, various microbial metabolic pathways are involved in lignin bioconversion processes, which has been characterized in extensive research work. With different types of lignin substrates (e.g., model compounds, technical lignin, and lignocellulosic biomass), several bacterial and fungal species have been proved to own lignin-degrading abilities and accumulate microbial products (e.g., lipid

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A Review on The Bioconversion of Lignin to Microbial Lipid with Oleaginous Rhodococcus opacus

Cited by 26 publications

References 68 publications

Applications of Lignocellulosic Fibers and Lignin in Bioplastics: A Review

Applications of Lignocellulosic Fibers and Lignin in Bioplastics: A Review

Recent advances in lignin valorization with bacterial cultures: microorganisms, metabolic pathways, and bio-products

Biotransformation of lignin: Mechanisms, applications and future work

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