Microbial degradation of polyhydroxyalkanoates in tropical soils

The integrated study addressing biodegradation of microbial linear polyesters of hydroxyalkanoic acids (polyhydroxyalkanoates, PHAs) in tropical conditions by microbial communities of Vietnamese soils was performed in locations close to Hanoi and Nha Trang, which differed in their weather conditions...

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Bibliographic Details
Published in:International biodeterioration & biodegradation 2013-09, Vol.83, p.77-84
Main Authors: Boyandin, Anatoly N., Prudnikova, Svetlana V., Karpov, Valery A., Ivonin, Vladimir N., Đỗ, Ngọc Lanh, Nguyễn, Thị Hoài, Lê, Thị Mỹ Hiệp, Filichev, Nikolay L., Levin, Alexander L., Filipenko, Maxim L., Volova, Tatiana G., Gitelson, Iosif I.
Format: Article
Language:English
Subjects:
Bacteria
Biodegradation
Biopolymer properties
Biopolymers
Communities
Copolymers
Degradation
Microorganisms
PHA degrading microorganisms
Polyhydroxyalkanoates
Polyhydroxyalkanoates (PHAs)
Soil biodegradation
Soils
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Summary:The integrated study addressing biodegradation of microbial linear polyesters of hydroxyalkanoic acids (polyhydroxyalkanoates, PHAs) in tropical conditions by microbial communities of Vietnamese soils was performed in locations close to Hanoi and Nha Trang, which differed in their weather conditions and microbial communities. It shows that PHA degradation in tropical soils is influenced by polymer chemical composition, specimen shape, and microbial characteristics. The homopolymer of 3-hydroxybutyric acid is degraded at higher rates than the copolymer of 3-hydroxybutyric and 3-hydroxyvaleric acids. The average rates of mass loss were 0.04–0.33% per day for films and 0.02–0.18% for compact pellets. PHA degradation was accompanied by a decrease in the polymer molecular mass and, usually, an increase in the degree of crystallinity, suggesting preferential degradation of the amorphous phase. Under the study conditions, representatives of the bacterial genera Burkholderia, Bacillus, Cupriavidus, Mycobacterium, and Nocardiopsis and such micromycetes as Acremonium, Gongronella, Paecilomyces, and Penicillium, Trichoderma have been identified as major PHA degraders. •3-hydroxybutyrate was degraded quicker than 3-hydroxybutyrate-co-3-hydroxyvalerate.•PHA degradation was accompanied by a decrease in the polymer molecular mass.•PHA degradation was accompanied by an increase in the degree of crystallinity.•PHA degraders (bacteria and fungi) were isolated and characterized.
ISSN:0964-8305
1879-0208
DOI:10.1016/j.ibiod.2013.04.014