Marine bacterial biodegradation of low-density polyethylene (LDPE) plastic

Khandare, Shrikant D.; Chaudhary, Doongar R.; Jha, Bhavanath

doi:10.1007/s10532-021-09927-0

Cited by 97 publications

(28 citation statements)

References 61 publications

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“…The morphological changes like pits, roughness, and cracks were confirmed using FE‐SEM and AFM, and they were reported by Khandare and his coworkers. [ 153 ] Sen and Raut [ 154 ] reviewed the interactions of micro‐organisms with LDPE material and analyzed the biochemical changes. They reported that microbial enzymes are the most powerful elements for biodegrading LDPEs among different biological agents.…”

Section: Sustainable Technologiesmentioning

confidence: 99%

Sustainable recycling technologies for thermoplastic polymers and their composites: A review of the state of the art

et al. 2022

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This review article discusses the environmental and economic effects of recycling, as well as sustainable thermoplastic polymer recycling technologies. Several researchers have utilized recycled thermoplastics as matrices in the production of a variety of natural and synthetic‐based composites, which is also the focus of this study. All of the industries (food and packaging, construction and building, transportation, and indoor usage) where recycled thermoplastics have a large market share (food and packaging, construction and building, transportation, and indoor usage) are covered in this review. The desirable properties of thermoplastic polymers, such as corrosion resistance, low density, and user‐friendliness, have caused plastic production to surpass aluminum and other metals in use over the past 60 years. Furthermore, recycling is one of the most important measures available to mitigate these effects and is one of the most dynamic segments of the plastics industry at present. Increased landfilling and incineration of plastics have a negative impact on the ecosystem, and the continued increase in the production of virgin fossil plastic also has a negative impact on the environment. Consequently, this continuous production could lead to the depletion of fossil fuel resources, an increase in environmental emissions during processing, and eventual incineration. Increasing numbers of nations are adopting the circular economy concept in an effort to avoid all of these problems. This concept emphasizes the reuse of products and resources, as well as the recycling of materials according to the waste hierarchy, rather than their cremation or disposal in the environment.

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Section: Sustainable Technologiesmentioning

confidence: 99%

Sustainable recycling technologies for thermoplastic polymers and their composites: A review of the state of the art

et al. 2022

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“…We experienced that emulsification is not an easy-going method, difficult to reproduce and a challenge in keeping the final dispersion stable. Another approach is the addition of plastic granules or pellets to the medium and screen for clearance ( Khandare et al, 2021 ; Spina et al, 2021 ).…”

Section: The Challenges Of Experimental Design and Set-upmentioning

confidence: 99%

Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

2022

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Annually, 400 Mt of plastics are produced of which roughly 40% is discarded within a year. Current plastic waste management approaches focus on applying physical, thermal, and chemical treatments of plastic polymers. However, these methods have severe limitations leading to the loss of valuable materials and resources. Another major drawback is the rapid accumulation of plastics into the environment causing one of the biggest environmental threats of the twenty-first century. Therefore, to complement current plastic management approaches novel routes toward plastic degradation and upcycling need to be developed. Enzymatic degradation and conversion of plastics present a promising approach toward sustainable recycling of plastics and plastics building blocks. However, the quest for novel enzymes that efficiently operate in cost-effective, large-scale plastics degradation poses many challenges. To date, a wide range of experimental set-ups has been reported, in many cases lacking a detailed investigation of microbial species exhibiting plastics degrading properties as well as of their corresponding plastics degrading enzymes. The apparent lack of consistent approaches compromises the necessary discovery of a wide range of novel enzymes. In this review, we discuss prospects and possibilities for efficient enzymatic degradation, recycling, and upcycling of plastics, in correlation with their wide diversity and broad utilization. Current methods for the identification and optimization of plastics degrading enzymes are compared and discussed. We present a framework for a standardized workflow, allowing transparent discovery and optimization of novel enzymes for efficient and sustainable plastics degradation in the future.

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“…The reaction mixture was prepared by adding 0.8 ml phosphate buffer solution (0.1 M, pH 7.0), 0.066 ml supernatant devoid of cells, and the substrate of 0.134 ml incubated at 30°C for 30 minutes. The sample changed its color and was measured with respect to control as a blank using a UV visible spectrophotometer at 410 nm [26].…”

Section: Esterase and Lipase Enzyme Assaymentioning

confidence: 99%

“…They also participate in the catabolic activities of hydrocarbon degradation [25]. The action of enzymes connected with respiration and energy production pathways demonstrates the metabolic state of bacteria [26]. Kumar et al [41] identified that Bacillus sp.…”

Section: Enzymatic Assay During Degradation Of Ldpementioning

confidence: 99%

Biodegradation and detoxification of low-density polyethylene by an indigenous strain Bacillus licheniformis SARR1

Rani¹,

Rathee²,

Kumari³

et al. 2022

J Appl Biol Biotech

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Plastics are synthetic polymers, which are frequently used in daily life for a wide range of purposes. These plastic wastes are accumulated and generate plastic pollution in the environment. It needs many years for complete deterioration in the environmental conditions. Biodegradation is the most promising method to treat plastic pollution, as the microorganisms utilize the low-density polyethylene (LDPE) as a sole source of carbon, and this indicates an innovative approach to manage the problem of plastic waste. The isolate SARR1 was identified as Bacillus licheniformis using the National Center for Biotechnology Information (NCBI) database. The isolate SARR1 showed an LDPE removal rate (K) of 0.069 g day −1 with a half-life of approximately 335.32 days to degrade LDPE strips. The biomass production was 0.98 ± 0.006 gl −1 (X m ) during the incubation of 30 days, and the percentage of crystallinity was significantly decreased from 71.69% to 50.78% due to biodegradation. The esterase and lipase activity of isolate SARR1 was studied using UV visible spectroscopy. The gas chromatography-mass spectrometry analysis confirmed the synthesis of acetone, diazene dimethyl, and carbamimidothioic acid, 1-methylethyl ester with different peak area percentages of 23.38%, 65.58%, and 11.04%, respectively. Seed germination study showed that the compounds formed after biodegradation of LDPE by bacterial strain SARR1 were eco-friendly.

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Marine bacterial biodegradation of low-density polyethylene (LDPE) plastic

Cited by 97 publications

References 61 publications

Sustainable recycling technologies for thermoplastic polymers and their composites: A review of the state of the art

Sustainable recycling technologies for thermoplastic polymers and their composites: A review of the state of the art

Toward Microbial Recycling and Upcycling of Plastics: Prospects and Challenges

Biodegradation and detoxification of low-density polyethylene by an indigenous strain Bacillus licheniformis SARR1

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