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首页> 外文期刊>Environmental toxicology and chemistry >ENANTIOMER-SPECIFIC BIOMAGNIFICATION OF α-HEXACHLOROCYCLOHEXANE AND SELECTED CHIRAL HLORDANE-RELATED COMPOUNDS WITHIN AN ARCTIC MARINE FOOD WEB
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ENANTIOMER-SPECIFIC BIOMAGNIFICATION OF α-HEXACHLOROCYCLOHEXANE AND SELECTED CHIRAL HLORDANE-RELATED COMPOUNDS WITHIN AN ARCTIC MARINE FOOD WEB

机译：北极海洋食物网中α-六氯环己烷和特定手性环烷烃相关化合物的对映体比生物放大

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摘要

Concentrations of achiral and chiral organochlorine contaminants (OCs), including hexachlorocyclohexane isomers (HCH), chlordane congeners (cis- and trans-chlordane, cis- and trans-nonachlor, MC5, MC7, and U82), and related metabolites (oxychlordane [OXY] and heptachlor exo-epoxide [HEPX]), were quantified in seawater (100 L; n = 6) and biota from the coastal Beaufort-Chukchi Seas food web near Barrow (AK, USA). The biota included zooplankton (Calanus spp.; n = 5), fish species such as arctic cod (Boreogadus saida; n = 10), arctic char (Salvelinus alpinus; n = 3), and marine mammals including bowhead whales (Balaena mysticetus; liver: n = 23; blubber: n = 40), beluga whales (Delphinapterus leucas; blubber: n = 20), ringed seals (Phoca hispida; blubber: n = 20), and bearded seals (Erignathus barbatus; blubber: n = 7). The food web magnification factors (FWMFs) for HCHs and chlordane compounds ranged from 0.5 (γ-HCH) to 6.5 (HEPX) and were expected based on known recalcitrance and biotransformation of OCs. The enantiomer fractions (EFs) of all chiral OCs were near racemic (EF = 0.50) in seawater, zooplankton, and all fish analyzed. In contrast, the EFs for most OCs analyzed were nonracemic (EF ≠ 0.50) in the marine mammals blubber (range: 0.09―0.79) because of enantiomer-specific biotransformation and (or) accumulation. However, EF values were not significantly correlated with isotopically determined trophic level. The EFs for all chiral OCs (except α-HCH) in bowhead whale liver closely approximated the values in zooplankton, suggesting that the accumulation of chiral OCs from prey into this cetacean is not enantiomer specific. However, the modification of EFs from bowhead liver to blubber suggests that this species has the ability to enantioselectively biotransform and accumulate several chiral OC compounds.
机译：非手性和手性有机氯污染物（OCs）的浓度，包括六氯环己烷异构体（HCH），氯丹同类物（顺式和反式氯丹，顺式和反式九氯，MC5，MC7和U82）以及相关的代谢物（氧氯丹[OXY ]和七氯环氧丙烷（HEPX））在海水中（100 L； n = 6）和来自巴罗（美国AK）附近的Beaufort-Chukchi Seas沿海食物网的生物区系进行定量。该生物群包括浮游动物（Calaus spp。； n = 5），鱼类如北极鳕（Boreogadus saida； n = 10），北极红点鲑（Salvelinus alpinus； n = 3）以及包括弓头鲸（Balaena mysticetus）在内的海洋哺乳动物。肝脏：n = 23；橡胶：n = 40），白鲸（Delphinapterus leucas；橡胶：n = 20），环斑海豹（海豹（Phoca hispida）；橡胶：n = 20）和大胡子海豹（Erignathus barbatus；橡胶：n = 7）。六氯环己烷和氯丹化合物的食物网放大系数（FWMF）在0.5（γ-HCH）至6.5（HEPX）之间，并且是基于已知的OCs顽抗性和生物转化预期的。在海水，浮游动物和所有被分析的鱼类中，所有手性OC的对映体分数（EFs）接近外消旋（EF = 0.50）。相比之下，由于对映体特异性的生物转化和（或）积累，在海洋哺乳动物的油脂中，大多数被分析的OC的EFs是非消旋的（EF≠0.50）。但是，EF值与同位素确定的营养水平没有显着相关。弓头鲸肝脏中所有​​手性OC（除α-六氯环己烷）的EF值都与浮游动物中的值非常接近，这表明手性OC从猎物向鲸类中的积累不是对映体特异性的。但是，从弓形虫肝到脂肪的EF修饰表明，该物种具有对映选择性生物转化和积累几种手性OC化合物的能力。

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