Biodegradation of different formulations of polyhydroxybutyrate films in soil.
Biodegradation of different formulations of polyhydroxybutyrate films in soil.
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DOI：
10.1186/s40064-016-2480-2
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Yousif E
中科院分区：
文献类型：
--
作者：
Altaee N;El-Hiti GA;Fahdil A;Sudesh K;Yousif E
石油聚合物导致不可降解的废料，因此期望生产生态友好的可降解材料。在低聚物水解酶和聚羟基丁酸酯解聚酶存在下，聚羟基丁酸酯（PHB）被生物降解生成3-羟基丁酸，3-羟基丁酸可被氧化为乙酰乙酸。几种细菌和真菌可以降解土壤中的PHB。生物降解的PHB表现出显着降低的分子量（Mw），数均分子量（Mn）和分散性（Mw/Mn）的所有膜配方。纳米纤维的聚羟基丁酸酯及其复合材料表现出更快的降解相比，其他薄膜，并显示完全降解后3周。SEM显微照片显示各种表面形态变化，包括孔、腔、凹槽、切口、槽和指针的外观改变。这种变化是由于分泌PHB解聚酶的微生物的生长导致生物聚合物膜降解。然而，在TiO 2的存在下，聚羟基丁酸纳米纤维及其复合材料膜表现出更多的表面变化与断裂的大多数纳米纤维，其中有一个下降的纤维直径。聚羟基丁酸酯薄膜在土壤中的生物降解生物聚合物的降解有助于克服与使用石油聚合物相关的一些污染问题。与其他类型的PHB膜相比，由于其三维和高表面积的结构，PHB膜及其TiO 2复合物的降解速度更快。与PHB膜相比，复合膜中TiO 2纳米颗粒的存在减缓了降解过程。此外，紫外光处理后的聚羟基丁酸及其复合膜导致加速降解。
Petroleum polymers contribute to non-degradable waste materials and it would therefore be desirable to produce ecofriendly degradable materials. Biodegradation of polyhydroxybutyrate (PHB) in the presence of oligomer hydrolase and PHB depolymerase gave 3-hydroxybutyric acid which could be oxidized to acetyl acetate. Several bacteria and fungi can degrade PHB in the soil. Biodegradation of PHB showed a significant decrease in the molecular weight (Mw), number-average molecular weight (Mn) and the dispersity (Mw/Mn) for all the film formulations. Nanofibers of PHB and its composites showed faster degradation compared to other films and displayed complete degradation after 3 weeks. The SEM micrographs showed various surface morphology changes including alterations in appearance of pores, cavity, grooves, incisions, slots and pointers. Such changes were due to the growth of microorganisms that secreted PHB depolymerase enzyme which lead to the biopolymer films degradation. However, PHB nanofibers and its composites films in the presence of TiO2 demonstrated more surface changes with rupture of most nanofibers in which there was a drop in fibres diameter. Biodegradation of polyhydroxybutyrate films in soil The degradation of biopolymers help to overcome some of the pollution problems associated with the use of petroleum polymers. PHB nanofiber and its TiO2 composite were degraded faster compared to other PHB film types due to their three dimensional and high surface area structures. The presence of TiO2 nanoparticles in the composite films slowdown the degradation process compared to PHB films. Additionally, the PHB and its composite films that were prepared from UV treated PHB films led to acceleration of the degradation.