Biodegradation of gamma irradiated low density polyethylene and polypropylene by endophytic fungi

Sheik, Sana; Chandrashekar, K. R.; Swaroop, K.; Somashekarappa, H.M.

doi:10.1016/j.ibiod.2015.08.006

Cited by 169 publications

(70 citation statements)

References 34 publications

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“…Sheik et al . pointed out that the first stage of the biodegradation mechanism is the release of enzymes so that there is oxidation or hydrolysis of the polymers, creating functional groups capable of improving hydrophilicity and consequently the microorganisms adhesion to the polymeric matrix.…”

Section: Resultsmentioning

confidence: 99%

Biodegradation of mulch films from poly(butylene adipate co‐terephthalate), carnauba wax, and sugarcane residue

Oliveira

Mota

Mousinho

et al. 2019

J of Applied Polymer Sci

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Plastic mulching for agricultural purposes is a technique which began in the last century and since then its use has been perfected. The fragments of some large‐scale mulch films used may accumulate in the soil, release toxic substances, and affect soil microbial activity. The environmental problems generated by fragments of plastic films accumulated in soil have prompted the development and large‐scale use of biodegradable plastic mulch films. The aim of this work is to develop biodegradable plastic mulch films from poly(butylene adipate co‐terephthalate (PBAT), sugarcane residue, and carnauba wax and to evaluate its biodegradation when buried in soil. The films, obtained by flat extrusion, contained 2.5 and 5.0% sugarcane residue and 0 and 2.0% carnauba wax. Their biodegradation after burial in soil was monitored by mass loss, visual inspection, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Our data show biodegradation in soil to increase with sugarcane residue content and to be independent on carnauba wax addition. This behavior, confirmed by visual inspection, FTIR and SEM images, was associated with the biodegradability of lignocellulosic residues as microorganisms tend to attack this component first, thus eroding fiber/matrix interface and facilitating bio disintegration. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48240.

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Section: Resultsmentioning

confidence: 99%

Biodegradation of mulch films from poly(butylene adipate co‐terephthalate), carnauba wax, and sugarcane residue

Oliveira

Mota

Mousinho

et al. 2019

J of Applied Polymer Sci

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“…P. citronellolis EMBS027 isolated from landfill soil of municipal sites showed LDPE deterioration (Bhatia et al 2014). Sheik et al (2015) reported Aspergillus sp., P. lilacinus and L. theobromae as endophytic fungi for laccase production and polymer (LDPE) degradation. They incubated fungal cultures with radiation (with different range 0-1000 kGy) irradiated LDPE samples and observed the reduction in intrinsic viscosity and average molecular weight.…”

Section: Polyethylenementioning

confidence: 99%

Review on the current status of polymer degradation: a microbial approach

Pathak

Bithel

2017

Bioresour. Bioprocess.

596

241

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Inertness and the indiscriminate use of synthetic polymers leading to increased land and water pollution are of great concern. Plastic is the most useful synthetic polymer, employed in wide range of applications viz. the packaging industries, agriculture, household practices, etc. Unpredicted use of synthetic polymers is leading towards the accumulation of increased solid waste in the natural environment. This affects the natural system and creates various environmental hazards. Plastics are seen as an environmental threat because they are difficult to degrade. This review describes the occurrence and distribution of microbes that are involved in the degradation of both natural and synthetic polymers. Much interest is generated by the degradation of existing plastics using microorganisms. It seems that biological agents and their metabolic enzymes can be exploited as a potent tool for polymer degradation. Bacterial and fungal species are the most abundant biological agents found in nature and have distinct degradation abilities for natural and synthetic polymers.

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“…In addition, plastics are also reported to be biodegraded partially with the help of anaerobic process in composts and soil which produce carbon dioxide, water and methane11. However; the breakdown of large polymers to carbon dioxide (mineralization) requires several different organisms, with one breaking down the polymer into its constituent monomers, another one being able to use the monomers and excreting simpler waste compounds as by-products and a final one being able to use the excreted wastes12.…”

mentioning

confidence: 99%

Evaluation of HDPE and LDPE degradation by fungus, implemented by statistical optimization

Ojha

Pradhan

Singh

et al. 2017

Sci Rep

257

107

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Plastic in any form is a nuisance to the well-being of the environment. The ‘pestilence’ caused by it is mainly due to its non-degradable nature. With the industrial boom and the population explosion, the usage of plastic products has increased. A steady increase has been observed in the use of plastic products, and this has accelerated the pollution. Several attempts have been made to curb the problem at large by resorting to both chemical and biological methods. Chemical methods have only resulted in furthering the pollution by releasing toxic gases into the atmosphere; whereas; biological methods have been found to be eco-friendly however they are not cost effective. This paves the way for the current study where fungal isolates have been used to degrade polyethylene sheets (HDPE, LDPE). Two potential fungal strains, namely, Penicillium oxalicum NS4 (KU559906) and Penicillium chrysogenum NS10 (KU559907) had been isolated and identified to have plastic degrading abilities. Further, the growth medium for the strains was optimized with the help of RSM. The plastic sheets were subjected to treatment with microbial culture for 90 days. The extent of degradation was analyzed by, FE-SEM, AFM and FTIR. Morphological changes in the plastic sheet were determined.

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Biodegradation of gamma irradiated low density polyethylene and polypropylene by endophytic fungi

Cited by 169 publications

References 34 publications

Biodegradation of mulch films from poly(butylene adipate co‐terephthalate), carnauba wax, and sugarcane residue

Biodegradation of mulch films from poly(butylene adipate co‐terephthalate), carnauba wax, and sugarcane residue

Review on the current status of polymer degradation: a microbial approach

Evaluation of HDPE and LDPE degradation by fungus, implemented by statistical optimization

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