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首页> 外文期刊>Journal of Hazardous Materials >The HBCDs biodegradation using a Pseudomonas strain and its application in soil phytoremediation
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The HBCDs biodegradation using a Pseudomonas strain and its application in soil phytoremediation

机译：假单胞菌菌株对六溴环十二烷的生物降解作用及其在土壤植物修复中的应用

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Hexabromocyclododecanes (HBCDs) are the second-most widely used brominated flame retardants. They cause inappropriate antidiuretic hormone syndrome and can induce cancer. However, little information is available about bacterial degradation of HBCDs. In this study, HBCDs (alpha-, beta- and gamma-HBCD) degrading strain Pseudomonas aeruginosa HS9 was isolated, identified, and characterized. The strain HS9 could remove 69% ( +/- 0.05%) of 1.7 mg/L HBCDs in 14 days. Based on identification of metabolites, this bacterium could oxidize HBCDs by two pathways. In the first, HBCDs are sequentially debromized to tetrabromocyclododecene, di-bromocyclododecadiene, and then debromized once more to cis, trans, trans-1, 5, 9-cyclododecatriene (CDT). After that, CDT is then oxidized to 1,2-epoxy-5,9-cyclododecadiene. The second identified pathway is a simultaneous debrominating and hydroxylating process based on the detection of 2,5,6,9,10-pentabromocyclododecanols, which were newly identified. The strain's effects on plant-maize growth were tested and bioremediation evaluation trials were performed. The addition of strain HS9 could decrease HBCDs of 4.08 mg/g (87.6% removed) and 0.1 mg/g (25% removed) in soil and plants, respectively. Microbial diversity analysis shows that the addition of strain HS9 can promote the abundance of plant-beneficial bacteria, such as Methylobacillus, Nitrosomonas, Plancoccus, Bacillus, and Rhodococcus. The results provide insights for the bioremediation of HBCDs-contaminated soils.
机译：六溴环十二烷（HBCD）是使用最广泛的第二种溴化阻燃剂。它们会导致不适当的抗利尿激素综合征，并可能诱发癌症。但是，关于六溴环十二烷细菌降解的信息很少。在这项研究中，分离，鉴定并鉴定了降解HBCD（α-，β-和γ-HBCD）的铜绿假单胞菌HS9菌株。 HS9菌株可在14天之内除去69％（+/- 0.05％）的1.7 mg / L六溴环十二烷。在鉴定代谢产物的基础上，该细菌可以通过两种途径氧化六溴环十二烷。首先，将六溴环十二烷依次脱溴为四溴环十二碳烯，二溴环十二碳二烯，然后再脱溴为顺式，反式，反式，1、5、9-环十二碳三烯（CDT）。此后，然后将CDT氧化为1,2-环氧-5,9-环十二碳二烯。第二个确定的途径是基于新鉴定的2,5,6,9,10-五溴环十二烷醇的检测同时脱溴和羟化过程。测试了该菌株对植物玉米生长的影响，并进行了生物修复评估试验。添加HS9菌株可在土壤和植物中分别降低HBCD 4.08 mg / g（去除87.6％）和0.1 mg / g（去除25％）。微生物多样性分析表明，菌株HS9的添加可以促进植物有益细菌的丰度，例如甲基杆菌，亚硝基梭菌，平球菌，芽孢杆菌和红球菌。研究结果为六溴环十二烷污染土壤的生物修复提供了见识。

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