聚乙烯纳米塑料的内在过氧化酶类活性介导氧化应激
Yi Tan1, Siyue Chen1, Mengjiao Wang2
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Jiangsu 210023, China.
Environmental science & technology
|August 22, 2024
概括
聚乙烯纳米塑料 (PSNPs) 表现出内在的过氧化酶类活性,调解氧化应激. 这种活动取决于温度,pH值和表面芳香结构,为纳米塑料对环境的影响提供了洞察力.
科学领域:
- 环境科学 环境科学
- 纳米技术 纳米技术
- 生物化学 生物化学
背景情况:
- 纳米塑料是一个全球环境问题,可能会对健康产生影响.
- 了解生物和环境系统中的纳米塑料反应性至关重要.
研究的目的:
- 为了研究聚烯纳米塑料 (PSNPs) 的内在过氧化酶类活性.
- 阐明影响这种活动的因素及其在氧化应激中介作用.
主要方法:
- 在不同温度和pH值下,PSNP过氧化酶类活性的表征.
- 使用迈凯利斯-门模型进行动力分析.
- 对臭氧诱导的老化对PSNP活动和表面化学的影响的评估.
- 氧化应激调解的评估使用 Askorbic 酸测试.
主要成果:
- PSNP具有内在的过氧化酶类活性,取决于温度 (最佳40°C) 和pH (最佳4.5).
- 活动遵循迈凯利斯-门动力学,通过电子转移到H2O2.2.的介导.
- 臭氧老化最初通过增加氧基来增强活性,但随着广泛的芳香结构降解而减少活性.
- 通过PSNP介导的氧化应激与芳香结构相关.
结论:
- PSNP表现出类似酶的催化活性,有助于氧化应激.
- 表面化学,特别是芳香结构和含氧组,决定了PSNP的反应性.
- 结果提供了对纳米塑料环境和健康风险的机制性见解.
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