Microbial degradation of polyhydroxyalkanoates in tropical soils
Microbial degradation of polyhydroxyalkanoates in tropical soils
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DOI：
10.1016/j.ibiod.2013.04.014
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发表时间：
2013-09-01
影响因子：
4.8
通讯作者：
Gitelson, Iosif I.
中科院分区：
文献类型：
--
作者：
Boyandin, Anatoly N.;Prudnikova, Svetlana V.;Gitelson, Iosif I.
在气候条件和微生物群落不同的河内和芽庄附近，进行了越南土壤微生物群落在热带条件下对微生物线性羟基烷酸聚酯(聚羟基烷酸酯，PHAs)的生物降解的综合研究。结果表明，PHA在热带土壤中的降解受聚合物化学成分、样品形状和微生物特性的影响。3-羟基丁酸均聚物的降解率高于3-羟基丁酸和3-羟基戊酸的共聚物。薄膜的平均质量损失率为0.04-0.33%，致密颗粒的平均质量损失率为0.02-0.18%。PHA的降解伴随着聚合物相对分子质量的下降，通常是结晶度的增加，这表明非晶相的优先降解。在本研究条件下，伯克霍尔德菌属、芽孢杆菌属、铜绿假单胞菌属、分枝杆菌属和诺卡氏菌属的代表细菌和微小真菌如顶盖霉属、贡罗氏菌属、拟青霉属和青霉属、木霉属被鉴定为主要的PHA降解物。(C)2013爱思唯尔有限公司。保留所有权利。
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. (C) 2013 Elsevier Ltd. All rights reserved.