持久性有机污染物的毒性:一个理论研究
1Departamento de Materiales de Baja Dimensionalidad, Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S.N. Ciudad Universitaria, 04510, CDMX, CP, Mexico. martina@unam.mx.
Journal of molecular modeling
|March 7, 2024
概括
在多双 (PCB) 和多二乙烯 (PBDE) 中更多的原子增加了它们的氧化潜力和氧化应激. 这些污染物与DNA相互作用,这可能解释了它们在南极企中的毒性.
科学领域:
- 环境化学环境化学
- 计算化学计算化学
- 毒理学 毒理学 毒理学
背景情况:
- 多双 (PCB) 和多二乙烯 (PBDE) 是全球发现的持久性有机污染物,包括南极企.
- 这些化合物由于其持久性和毒性而带来风险,氧化应激被认为是关键机制.
- 以前的研究表明,在南极野生动物中存在PCB和PBDE,这引发了对生态系统健康的担忧.
研究的目的:
- 用理论方法研究在南极企中发现的PCB和PBDE的氧化应激潜力.
- 分析这些污染物的电子转移特性和DNA相互作用能力.
- 探索类代谢物在PCB和PBDE的神经毒性中的作用.
主要方法:
- 密度函数理论 (DFT) 计算使用高斯16在M06-2x/6-311+g(2d,p) 层面使用.
- 使用了包括电捐 (ω-) 和电接收 (ω+) 功率在内的全局反应性描述器.
- 评估了局部反应性,使用缩的福井函数.
主要成果:
- 含或原子数量较多的化合物表现出更大的氧化潜力,并诱导了更多的氧化应激.
- 研究的PCB和PBDE通过键与DNA基直接相互作用.
- 对类代谢物的分析表明,与神经毒性存在潜在联系.
结论:
- 素原子的数量与PCB和PBDE引起的氧化应激直接相关.
- 与DNA基的相互作用为这些污染物的观察到的毒性提供了一个合理的机制.
- 基于DFT的反应性分析为PCB和PBDE带来的环境风险提供了宝贵的见解.
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