...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >The freshwater invertebrate Mysis relicta can eliminate chiral organochlorine compounds enantioselectively
【24h】

The freshwater invertebrate Mysis relicta can eliminate chiral organochlorine compounds enantioselectively

机译：淡水无脊椎动物Mysis relicta可以选择性地消除手性有机氯化合物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Accumulation and elimination of chiral polychlorinated biphenyls (PCBs) and organochlorine (OC) pesticides by the opossum shrimp, Mysis relicta, was investigated to determine if zooplankton can stereoselectively process chiral OC contaminants. Concentrations and enantiomer fractions were measured within mysids over a 10-day exposure followed by a 45-day depuration period. Rapid accumulation occurred within mysids exposed to sediment contaminated with racemic chiral OC compounds at Ag/g levels. Enantiomer enrichment was observed within mysids for the second-eluting enantiomer and the (-)-enantiomer of PCB 95 and trans-chlordane, respectively, after 7 days of exposure to spiked sediment, and for the second-eluting enantiomers of PCBs 91 and 183 and (-)-PCB 149 over longer time periods. Enantiomer fractions decreased with time during the depuration phase of the experiment for these compounds, showing that their elimination from mysids was stereoselective. Oxychlordane was detected in nonracemic proportions after exposure, indicating that mysids can metabolize trans-chlordane enantioselectively. Minimum elimination rates calculated were higher than biotransformation rates calculated for fish in previous studies, which have been shown to metabolize OC contaminants. This study is the first to show stereoselective processing of chiral OC contaminants by aquatic invertebrates.
机译：研究了负鼠虾Mysis relicta积累和消除手性多氯联苯（PCBs）和有机氯（OC）杀虫剂，以确定浮游动物是否可以立体选择性地处理手性OC污染物。在暴露10天，随后45天净化期的过程中，测定了衣壳中的浓度和对映体分数。在暴露于受外消旋手性OC化合物污染的Ag / g水平的沉积物中的类鸦片内快速积累。暴露于加标沉淀物中7天后，PCB 95和反式氯丹中第二种洗脱对映体和（-）-对映异构体，以及PCB 91和183中第二种洗脱对映体的异构体中均观察到对映体富集和（-）-PCB 149较长的时间。对于这些化合物，在实验的纯化阶段，对映体分数随时间的推移而降低，表明它们从衣壳中消除具有立体选择性。暴露后以非外消旋的比例检测到了环氧氯丙烷，表明芥酸类可以对映体选择性地代谢反式氯丹。计算出的最小消除率高于先前研究中对鱼类计算出的生物转化率，后者已显示可代谢OC污染物。这项研究是第一个显示水生无脊椎动物立体选择性处理手性OC污染物的方法。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号