Chemical and physical changes occurring in polyester polyurethane during biodegradation

Kay, M.J.; McCabe, Richard W.; Morton, L.H.G.

doi:10.1016/0964-8305(93)90006-n

Cited by 99 publications

(44 citation statements)

References 15 publications

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“…Polyester salt complexes have been synthesized for potential battery applications. It was found that the thermal stability of these complexes was significantly less than for polyester (Kay et al, 1993). However, it is unknown whether these complexes would occur outside a laboratory.…”

Section: -37mentioning

confidence: 99%

“…Polyester polyurethurzeshave been found to degrade via microbial attack. Polyether polyurduuzes have been found to be more resistant polyester polyurethane (Kay, 1993). Thus, it is assumed that the weak "link" is the polyester rather than the polyurethane.…”

Section: Biotic Chemistry (Rnicrobially Mediated Chemistry)mentioning

confidence: 99%

“…The polyester segment of a the polymer is the main site for attack which could be degraded within two weeks (Kay et al, 1993). However, these experiments were supplemented with yeast and the assumption was made that the polymer was consumed as a result of cometabolism.…”

Section: Biotic Chemistry (Rnicrobially Mediated Chemistry)mentioning

confidence: 99%

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Volume II: near-field and altered-zone environment report

Wilder¹

1996

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Section: -37mentioning

confidence: 99%

Section: Biotic Chemistry (Rnicrobially Mediated Chemistry)mentioning

confidence: 99%

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Volume II: near-field and altered-zone environment report

Wilder¹

1996

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“…Esterase activity was measured by the method of Kay et al with p-nitrophenyl acetate as the substrate (10). One unit was defined as the amount of enzyme required to liberate 1 mol of p-nitrophenol per min.…”

Section: Methodsmentioning

confidence: 99%

Cloning and Sequencing of a Poly( dl -Lactic Acid) Depolymerase Gene from Paenibacillus amylolyticus Strain TB-13 and Its Functional Expression in Escherichia coli

Akutsu-Shigeno

Teeraphatpornchai

Teamtisong

et al. 2003

Appl Environ Microbiol

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The gene encoding a poly(DL-lactic acid) (PLA) depolymerase from Paenibacillus amylolyticus strain TB-13 was cloned and overexpressed in Escherichia coli. The purified recombinant PLA depolymerase, PlaA, exhibited degradation activities toward various biodegradable polyesters, such as poly(butylene succinate), poly(butylene succinate-co-adipate), poly(ethylene succinate), and poly(⑀-caprolactone), as well as PLA. The monomeric lactic acid was detected as the degradation product of PLA. The substrate specificity toward triglycerides and p-nitrophenyl esters indicated that PlaA is a type of lipase. The gene encoded 201 amino acid residues, including the conserved pentapeptide Ala-His-Ser-Met-Gly, present in the lipases of mesophilic Bacillus species. The identity of the amino acid sequence of PlaA with Bacillus lipases was no more than 45 to 50%, and some of its properties were different from those of these lipases.

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“…Indeed, proteolytic enzymes (papain and urease) and cholesterol esterase have been shown to degrade PUs in vitro. Several reports have appeared in the literature on polyester PU degradation due to the hydrolysis of the ester bonds, but not because bacteria utilized them as a primary nutrient source nor as a result of co-metabolism (Kay et al, 1993). However, Nakajima- Kambe et al (1997) reported a bacterial strain, Comamonas acidovorans, which uses the solid polyester PU as the sole carbon and nitrogen source.…”

Section: A741 Biodegradation Of Polyestersmentioning

confidence: 99%