Microbial Degradation and Valorization of Plastic Wastes

Ru, Jiakang; Huo, Yi-Xin; Yang, Yu

doi:10.3389/fmicb.2020.00442

Cited by 388 publications

(264 citation statements)

References 196 publications

(214 reference statements)

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“…The chemical structures of both PS and PPS have an aromatic ring in common ( Figure 4 A). A greater number of enzyme-mediated reaction steps are required to open the aromatic ring to produce acetyl-Co A, or to succinate for the TCA cycle and PHA for energy production [ 41 ]. Thus, rather more complicated enzyme systems could be one of the reasons for their slowed biodegradation rates compared with PE ( Figure 4 B).…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Biodegradation Efficiency of Four Various Types of Plastics by Pseudomonas aeruginosa Isolated from the Gut Extract of Superworms

et al. 2020

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Plastic waste worldwide is becoming a serious pollution problem for the planet. Various physical and chemical methods have been tested in attempts to remove plastic dumps. However, these have usually resulted in secondary pollution issues. Recently, the biodegradation of plastic by fungal and bacterial strains has been spotlighted as a promising solution to remove plastic wastes without generating secondary pollution. We have previously reported that a Pseudomonas aeruginosa strain isolated from the gut of a superworm is capable of biodegrading polystyrene (PS) and polyphenylene sulfide (PPS). Herein, we demonstrate the extraordinary biodegradative power of P. aeruginosa in efficiently depolymerizing four different types of plastics: PS, PPS, polyethylene (PE) and polypropylene (PP). We further compared biodegradation rates for these four plastic types and found that PE was biodegraded fastest, whereas the biodegradation of PP was the slowest. Moreover, the growth rates of P. aeruginosa were not always proportional to biodegradation rates, suggesting that the rate of bacterial growth could be influenced by the composition and properties of intermediate molecules produced during plastic biodegradation, and these may supply useful cellular precursors and energy. In conclusion, an initial screening system to select the most suitable bacterial strain to biodegrade certain types of plastic is particularly important and may be necessary to solve plastic waste problems both presently and in the future.

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Biodegradation Efficiency of Four Various Types of Plastics by Pseudomonas aeruginosa Isolated from the Gut Extract of Superworms

et al. 2020

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“…Furthermore, we documented that antibiotic repression of gut microbiota will weaken their capability of degrading plastic [7]. This result suggested that their gut microbiota played an indispensable role in plastic degradation and may be a bioresource for the pursuit of plastic-degrading microbes [8]. Therefore, we made an effort to screen the plastic-degrading microbes from their gut microbiota.…”

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confidence: 99%

Intestinirhabdus alba gen. nov., sp. nov., a novel genus of the family Enterobacteriaceae, isolated from the gut of plastic-eating larvae of the Coleoptera insect Zophobas atratus

Xia

Huo

et al. 2020

International Journal of Systematic and Evolutionary Microbiology

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A bacterial strain, BIT-B35T, was isolated from the gut of plastic-eating larvae of the Coleoptera insect Zophobas atratus. Its taxonomic position was determined by using a polyphasic approach. Cells were white-pigmented, Gram-stain-negative, motile short rods with terminal flagella. The 16S rRNA gene sequence (1411 bp) of strain BIT-B35T showed highest similarity (98.1%) to Escherichia fergusonii ATCC 35469T and Citrobacter koseri LMG 5519T. The results of phylogenetic analyses, based on the 16S rRNA gene, concatenated sequences of seven housekeeping genes (atpD, gyrB, infB, rpoB, pyrG, fusA and leuS) and genome sequences, placed strain BIT-B35T in a separate lineage among the family of Enterobacteriaceae . The major fatty acids were C16 : 0, C17 : 0 cyclo and C19 : 0 cyclo ω8c. The genomic DNA G+C content of strain BIT-B35T was 57.1 mol%. The chemotaxonomic data plus results of physiological and biochemical tests also distinguished strain BIT-B35T from members of other genera within the family Enterobacteriaceae . Therefore, strain BIT-B35T is considered to represent a novel species of a novel genus within the family Enterobacteriaceae , for which the name Intestinirhabdus alba gen. nov., sp. nov. is proposed. The type strain is BIT-B35T (=CGMCC 1.17042T=KCTC 72448T).

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“…The positive weight reduction implies that specific catabolic enzymes were synthesised by the isolates and attacked the untreated PP microplastic, leading to the polymer's partial degradation and subsequent reduction. As mentioned earlier, these isolates may also possess a particular signalling and catabolic pathway that promotes the cell adherence to the polymers and their subsequent absorption/desorption and degradation [37]. Lack of degradation in the control flask was indicated by the constant weight of PP microplastics throughout the experiment.…”

Section: Growth Of Bacteria On Pp-supplemented Medium and Estimation mentioning

confidence: 88%

“…Yet, the small growth of ADL15 could degrade a higher percentage of PP microplastic (Mdn = 17, n = 3) than ADL36 (Mdn = 7, n = 3) (U = 0.000, p = 0.043, r = 0.825), as shown in Figure 1c. The growth of these bacterial isolates might differ due to their distinctive metabolic rates, genetic plasticity, polymer preferences, and mode of substrate colonisation [37]. The higher tolerance of ADL15 towards the exposure of PP could lie within the genus itself.…”

Section: Growth Of Bacteria On Pp-supplemented Medium and Estimation mentioning

confidence: 99%

Biodeterioration of Untreated Polypropylene Microplastic Particles by Antarctic Bacteria

et al. 2020

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Microplastic pollution is globally recognised as a serious environmental threat due to its ubiquitous presence related primarily to improper dumping of plastic wastes. While most studies have focused on microplastic contamination in the marine ecosystem, microplastic pollution in the soil environment is generally little understood and often overlooked. The presence of microplastics affects the soil ecosystem by disrupting the soil fertility and quality, degrading the food web, and subsequently influencing both food security and human health. This study evaluates the growth and biodegradation potential of the Antarctic soil bacteria Pseudomonas sp. ADL15 and Rhodococcus sp. ADL36 on the polypropylene (PP) microplastics in Bushnell Haas (BH) medium for 40 days. The degradation was monitored based on the weight loss of PP microplastics, removal rate constant per day (K), and their half-life. The validity of the PP microplastics’ biodegradation was assessed through structural changes via Fourier transform infrared spectroscopy analyses. The weight loss percentage of the PP microplastics by ADL15 and ADL36 after 40 days was 17.3% and 7.3%, respectively. The optimal growth in the BH media infused with PP microplastics was on the 40th and 30th day for ADL15 and ADL36, respectively. The infrared spectroscopic analysis revealed significant changes in the PP microplastics’ functional groups following the incubation with Antarctic strains.

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Microbial Degradation and Valorization of Plastic Wastes

Cited by 388 publications

References 196 publications

Evaluation of the Biodegradation Efficiency of Four Various Types of Plastics by Pseudomonas aeruginosa Isolated from the Gut Extract of Superworms

Evaluation of the Biodegradation Efficiency of Four Various Types of Plastics by Pseudomonas aeruginosa Isolated from the Gut Extract of Superworms

Intestinirhabdus alba gen. nov., sp. nov., a novel genus of the family Enterobacteriaceae, isolated from the gut of plastic-eating larvae of the Coleoptera insect Zophobas atratus

Biodeterioration of Untreated Polypropylene Microplastic Particles by Antarctic Bacteria

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