Hydrolysis of polyesters by lipases

Tokiwa, Yutaka; Suzuki, Tomoo

doi:10.1038/270076a0

Cited by 427 publications

(227 citation statements)

References 6 publications

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“…Microorganisms including bacteria and fungi secrete enzymes to biodegrade PCL. Tokiwa and Suzuki (1977) showed that PCL was hydrolyzed by lipases from various microorganisms. Oda et al (1997)found that a strain B273 identified as Alcaligenes faecalis excreted lipases to hydrolyze PCL.…”

Section: Starch/pcl Blends Biodegradation and Denitrification Mechanismsmentioning

confidence: 99%

Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Shen

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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The cross-linked starch/polycaprolactone (SPCL10) and starch/polycaprolactone (SPCL12) blends were prepared, characterized and used as carbon source and biofilm support for biological nitrate removal. The results showed that SPCL10 and SPCL12 had similar performance on water absorption (about 21 %) and leaching capacity. FTIR spectra confirmed the cross-linking reaction between starch and PCL. SEM displayed a thermoplastic nature of SPCL10 and SPCL12. These blends could serve as solid carbon source and biofilm support for biological denitrification, and the acclimation time of microbial biofilm on the surfaces of SPCL10, SPCL12 and PCL were about 2 days, 2 days and 16 days, respectively. The average denitrification rates were 0.0216, 0.0154 and 0.0071 mg NO 3 -N/(g h) for SPCL10, SPCL12 and PCL, respectively, and the effluent NO 2 -N concentration was below 1 mg/L at all cases. The phenomenon of ammonia formation was observed, but ammonia concentration was below 0.5 mg/L.

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Section: Starch/pcl Blends Biodegradation and Denitrification Mechanismsmentioning

confidence: 99%

Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Shen

Wang

et al. 2014

Int. J. Environ. Sci. Technol.

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“…The degradation of polymers using enzymes was first described in the year 1977 by Tokiwa and Suzuki [129]. As the use of ionic liquids and castor oil, this bio-chemical method was developed to provide an eco-friendly procedure of polymer recycling in contrast to conventional chemical recycling methods like methanolysis (high pressure and temperature), glycolysis (heterogeneous reaction products) or acidic and alkaline hydrolysis (pollution problems).…”

Section: De-polymerization Of Pet Using Enzymesmentioning

confidence: 99%

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Geyer¹,

Lorenz²,

Kandelbauer³

2016

Express Polym. Lett.

204

120

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Abstract.Recycling of poly(ethylene terephthalate) (PET) is of crucial importance, since worldwide amounts of PETwaste increase rapidly due to its widespread applications. Hence, several methods have been developed, like energetic, material, thermo-mechanical and chemical recycling of PET. Most frequently, PET-waste is incinerated for energy recovery, used as additive in concrete composites or glycolysed to yield mixtures of monomers and undefined oligomers. While energetic and thermo-mechanical recycling entail downcycling of the material, chemical recycling requires considerable amounts of chemicals and demanding processing steps entailing toxic and ecological issues. This review provides a thorough survey of PET-recycling including energetic, material, thermo-mechanical and chemical methods. It focuses on chemical methods describing important reaction parameters and yields of obtained reaction products. While most methods yield monomers, only a few yield undefined low molecular weight oligomers for impaired applications (dispersants or plasticizers). Further, the present work presents an alternative chemical recycling method of PET in comparison to existing chemical methods.

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“…The fate of the bottles in landfills can only be speculated about because they were used in landfills only a short time ago -shorter than that needed to make the changes of material detectable. PET marks out with a relatively good resistance to open-air ageing [1] as well as to the microbial attack [2,3]. Only recently, interesting results have been published on an effective hydrolysis of PET catalyzed by a hydrolase from the Thermobifida fusca actinomycete [4].…”

Section: Introductionmentioning

confidence: 99%

Aromatic-aliphatic copolyesters based on waste poly(ethylene terephthalate) and their biodegradability

Prokopová

Vlčková

Šašek³

et al. 2008

E-Polymers

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Abstract:The solvolysis of poly(ethylene terephthalate) from disposed beverage bottles by an aqueous solution of lactic acid, followed by the zinc acetate catalyzed polycondensation of the solvolytic product, yielded a series of aromatic-aliphatic copolyesters containing up to 55 mol.% of incorporated lactic acid structural units. Their molecular parameters were determined using SEC and viscometry. According to DSC, the copolyesters have amorphous structure. Selected copolyester samples were subjected to abiotic hydrolysis at pH 7 and 60 °C. After three days of hydrolysis, the mass of the samples decreased substantially and their molar mass was reduced. At 37 °C, strong degradation of copolyesters by action of the actinomycete Rhodococcus erythropolis was observed. Biodegradability of the copolyesters was confirmed by a composting test. In addition to the changes of the molecular structure of the composed samples, the physical degradation of the foils of the samples tested was also documented by SEM.

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Hydrolysis of polyesters by lipases

Cited by 427 publications

References 6 publications

Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Comparison of polycaprolactone and starch/polycaprolactone blends as carbon source for biological denitrification

Recycling of poly(ethylene terephthalate) – A review focusing on chemical methods

Aromatic-aliphatic copolyesters based on waste poly(ethylene terephthalate) and their biodegradability

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