从旅行者食用鱼类中量化甲基的净化
Ryan F Lepak1, Jean Hervé Mve Beh2, Clotaire Moukegni-Sika3
1Center for Computational Toxicology and Exposure, Great Lakes Toxicology and Ecology Division, U.S. Environmental Protection Agency Office of Research and Development, 6201 Congdon Blvd, Duluth, Minnesota 55804, United States.
Environment & health (Washington, D.C.)
|February 26, 2026
概括
人类头发有效地跟踪了鱼类消费中的甲基 (MeHg) 暴露,揭示了饮食变化和新陈代谢. 独特的同位素标志区分了暴露源,有助于生物监测.
科学领域:
- 环境科学 环境科学
- 毒理学 毒理学 毒理学
- 生物标志物研究 生物标志物研究
背景情况:
- 甲基 (MeHg) 是一种常见于鱼类中的神经毒素.
- 人类头发可以作为一种有价值的生物标志物来跟踪MeHg暴露.
- 了解头发中的MeHg动态需要区分饮食来源和代谢过程.
研究的目的:
- 评估人类头皮和面部毛发作为生物标志物,以跟踪MeHg暴露的变化.
- 调查食鱼类消费对MeHg积累和净化的影响.
- 利用 (Hg) 同位素特征来识别人类头发中的MeHg来源.
主要方法:
- 两名美国科学家在加为期两周的探险期间定期抽取头皮和面部毛发的样本.
- 在头发样本中分析总 (Hg) 和同位素比率 (δ202Hg).
- 参与者的头发中的同位素值与当地加鱼样品的比较.
主要成果:
- 观察到MeHg积累开始和程度的个体差异,以及类似的净化速率.
- 与当地鱼类相比,参与者在旅行前的明显的Hg同位素值证实了追踪MeHg来源转移的能力.
- 在MeHg净化过程中追踪in vivo代谢的 δ202Hg值,显示每日增加0.014±0.001‰,Hg损失8.3±1.1 ng g−1.1.
结论:
- 人类头发是监测MeHg暴露动态的可靠生物标志物,反映了饮食摄入量和来源.
- 该研究强调了现有的MeHg负担,当前摄入量和鱼类采购 (本地与市场) 之间的复杂相互作用.
- 现有的鱼毛 δ202Hg 偏移的文献值可能需要调整,以考虑到MeHg 暴露的时间因素.
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