纳米塑料通过细胞壁结构和组成的改变增加了藻类的吸收和Cd的毒性
Shuang Zhang1, Ziyi Sun1, Tianying Zheng1
1Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Department of Environmental Science, Zhejiang University, Hangzhou 310058, China.
Water research
|March 5, 2024
概括
聚乙烯纳米塑料 (PS-NP) 不起重金属载体的作用,而是通过改变细胞壁来增加藻类中的毒性. 这增加了的吸收和毒性,造成环境风险.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 水生毒理学 水生毒理学
背景情况:
- 纳米塑料 (NP) 是新出现的污染物,有可能与水生生态系统中的重金属相互作用.
- 没有完全理解NP作为重金属载体的作用及其对水生生物有毒性的影响.
- 研究NP和重金属的联合影响对于评估环境风险至关重要.
研究的目的:
- 研究聚烯纳米塑料 (PS-NP) 和 (Cd) 对淡水藻类Chlorella vulgaris的关节毒性.
- 阐明海藻细胞中PS-NPs和Cd之间相互作用的机制.
- 确定PS-NP是否作为Cd的载体并影响其毒性.
主要方法:
- 菌暴露于不同度的PS-NPs和Cd,单独或组合.
- 藻类细胞吸收的PS-NP和Cd的量化.
- 对藻类细胞壁结构和组成 (多糖) 的变化进行分析.
- 对藻类生长抑制和毒性的评估.
主要成果:
- 单独的PS-NPs显示出有限的进入藻类细胞和轻微的生长抑制.
- 由于PS-NP没有显著吸附Cd,因此它们作为载体的作用是可以忽略不计的.
- PS-NPs改变了藻类细胞壁,增加了pectin和hemicellulose含量,从而增强了Cd的吸收和毒性.
- 高Cd度削弱了细胞壁,促进了PS-NP的进入,增加了联合毒性.
结论:
- PS-NP增强Cd对藻类的毒性,不是通过作为载体,而是通过修改藻类细胞壁结构和组成.
- 改变的细胞壁增加了Cd的吸收和对毒性的敏感性,随后的Cd暴露促进了NP的进入.
- 这项研究为纳米塑料的生态毒理机制及其在水生生态系统中的环境风险提供了新的见解.
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