Debrominated, hydroxylated and methoxylated metabolism in maize (Zea mays L.) exposed to lesser polybrominated diphenyl ethers (PBDEs)
文献类型： 外文期刊
作者： Wang, Sen 1 ; Zhang, Shuzhen 1 ; Huang, Honglin 1 ; Lu, Anxiang 3 ; Ping, Hua 3 ;
作者机构： 1.Chinese Acad Sci, State Key Lab Environm Chem & Ecotoxicol, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China
2.Northwest Univ, Coll Urban & Environm Sci, Dept Environm Sci, Xian 710027, Peoples R China
3.Beijing Res Ctr Agrifood Testing & Farmland Monit, Beijing 100097, Peoples R China
关键词： PBDEs; Plant metabolism; Debromination; Hydroxylation; Methoxylation
期刊名称：CHEMOSPHERE （ 影响因子：7.086； 五年影响因子：6.956 ）
ISSN： 0045-6535
年卷期： 2012 年 89 卷 11 期
页码：
收录情况： SCI
摘要： A hydroponic experiment was conducted to investigate the debrominated, hydroxylated and methoxylated metabolism of polybrominated diphenyl ethers (PBDEs, BDE-15, -28 and -47) in maize. A total of six debrominated metabolites (de-PBDEs), seven hydroxylated PBDEs (OH-PBDEs, including two unidentified OH-di-PBDEs and one unidentified OH-tri-PBDE) and four methoxylated PBDEs (MeO-PBDEs) were determined in the exposed plants. The metabolic products were detected in maize only after 12 h of exposure to the PBDEs. However, the concentration of each type of the metabolites (de-PBDEs, OH-PBDEs or MeO-PBDEs) decreased at the later exposure time, possibly due to further metabolism. The removal of a bromine atom or the introduction of a hydroxyl/methoxy group was easier at the ortho-positions on the biphenyl structure than at the para-positions. Concentration ratios of the total debrominated, hydroxylated or methoxylated metabolites to the parent congener (BDE-28 or -47) generally followed the order of leaves > stems >> roots, and MeO-PBDEs > de-PBDEs >> OH-PBDEs. These results suggest that metabolism occurred preferentially in leaves and stems than in roots. Less transformation and shorter elimination half-life of OH-PBDEs would contribute to the lower concentrations of OH-PBDEs than of de-PBDEs or MeO-PBDEs in maize. (C) 2012 Elsevier Ltd. All rights reserved.
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