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Degradation of medium-chain-length polyhydroxyalkanoates in tropical forest and mangrove soils

, : Degradation of medium-chain-length polyhydroxyalkanoates in tropical forest and mangrove soils. Applied Biochemistry and Biotechnology 126(1): 23-33

Bacterial polyhydroxyalkanoates (PHAs) are perceived to be a suitable alternative to petrochemical plastics because they have similar material properties, are environmentally degradable, and are produced from renewable resources. In this study, the in situ degradation of medium-chain-length PHA (PHAMCL) films in tropical forest and mangrove soils was assessed. The PHAMCL was produced by Pseudomonas putida PGA1 using saponified palm kernel oil (SPKO) as the carbon source. After 112 d of burial, there was 16.7% reduction in gross weight of the films buried in acidic forest soil (FS), 3.0% in the ones buried in alkaline forest soil by the side of a stream (FSst) and 4.5% in those buried in mangrove soil (MS). There was a slight decrease in molecular weight for the films buried in FS but not for the films buried in FSst and in MS. However, no changes were observed for the melting temperature, glass transition temperature, monomer compositions, structure, and functional group analyses of the films from any of the burial sites during the test period. This means that the integral properties of the films were maintained during that period and degradation was by surface erosion. Scanning electron microscopy of the films from the three sites revealed holes on the film surfaces which could be attributed to attack by microorganisms and bigger organisms such as detritivores. For comparison purposes, films of polyhydroxybutyrate (PHB), a short-chain-length PHA, and polyethylene (PE) were buried together with the PHAMCL films in all three sites. The PHB films disintegrated completely in MS and lost 73.5% of their initial weight in FSst, but only 4.6% in FS suggesting that water movement played a major role in breaking up the brittle PHB films. The PE films did not register any weight loss in any of the test sites.


PMID: 16014996

DOI: 10.1007/s12010-005-0003-7

Other references

Feyrer, F.; Baxter, R., 1998: Splittail fecundity and egg size. Fecundity and egg size of splittail, Pogonichthys macrolepidotus, are described from 17 specimens collected from February to April 1996. Splittail included in the study ranged from 216 to 328 mm standard length and were sampled from a broad area o...

Fozzatti, C.; Riccetto, C.; Herrmann, V.; Brancalion, M.Fernanda.; Raimondi, M.; Nascif, C.H.; Marques, L.R.; Palma, P.P., 2013: Prevalence study of stress urinary incontinence in women who perform high-impact exercises. Stress urinary incontinence is a frequent complaint in medical offices and studies have shown that women who practice high impact sports develop its symptoms. To evaluate the prevalence of stress urinary incontinence in women who attend gyms and p...

Osterwalder; Greber; Stuck; Schlapbach, 1991: Experimental full-solid-angle substrate photoelectron-diffraction data at 1-keV energies: Implications for photoelectron holography. Physical Review. B, Condensed Matter 44(24): 13764-13767

Edelhoff, D.; Stimmelmayr, M.; Güth, J-Frederik., 2016: Dental biocorrosions - etiology, diagnostic, prevention and treatment options. Mmw Fortschritte der Medizin 158(8): 64-67

Cooke Michele L.; Underwood Chad; Rijken Peggy; Simo J.A.tonio; Muldoon Maureen, 2002: Does sedimentary stratigraphy control fracture flow paths?. Sedimentary strata often show repetitive facies patterns reflecting temporal changes in depositional environments. These stratigraphic patterns can be expressed in terms of mechanical stratigraphy. Mechanical units and the interfaces between units...

Stratford, M.R.L.; Riley, P.A.; Ramsden, C.A., 2011: Rapid halogen substitution and dibenzodioxin formation during tyrosinase-catalyzed oxidation of 4-halocatechols. 4-Fluoro-1,2-benzoquinone, generated by tyrosinase oxidation of 4-fluorocatechol in aqueous buffer, rapidly undergoes substitution by O-nucleophiles (water or catechols) with release of fluoride. 4-Chloro- and 4-bromocatechol behave similarly. The...

Vermouth, H.H.; Viano, J.C., 1976: Antirabies treatment of persons bitten by animals. Boletin de la Oficina Sanitaria Panamericana. Pan American Sanitary Bureau 81(1): 57-65

Campbell Ian H.; Kent Adam J.R., 1994: Sm-Nd systematics of hydrothermal scheelite from the Mount Charlotte gold mine, Kalgoorlie, Western Australia; isotopic evidence for the involvement of komatiites in Archaean gold mineralisation. Program with Abstracts - Geological Association of Canada(Mineralogical Association of Canada(Canadian Geophysical Union, Joint Annual Meeting 19: 18

McKenzie, J., 1975: Congenital abnormalities: today and tomorrow. A critical review of present-day attitudes to congenital abnormalities is presented, particularly in regard to treatment and prospects for the future. The imminent stagnation in advances in this field is attributed to a general apathy, lack of fin...

Collins, H.L.; DiCarlo, S.E., 1995: An educational tool for understanding the cardiovascular changes associated with diabetes. Diabetes, a syndrome characterized by high plasma glucose and low plasma insulin concentrations, is associated with somatic and autonomic neuropadiabetes as well as cardiac and vascular disorders. These consequences of diabetes significantly affec...