聚乳酸 (PLA) 微塑料在Cladoceran Daphnia magna上的多层毒性评估
Beatrice De Felice1, Stefano Gazzotti2, Marco Aldo Ortenzi2
1University of Milan, Department of Environmental Science and Policy, via Celoria 26, I-20133 Milan, Italy.
Aquatic toxicology (Amsterdam, Netherlands)
|May 30, 2024
概括
生物塑料,如聚乳酸 (PLA),可以形成微塑料 (MPs),危害水生生物. 研究表明,PLA微塑料会影响大的氧化状态和能量,增加游泳活动.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 聚合物科学 聚合物科学
背景情况:
- 塑料废物是一个全球性问题,推动了向生物塑料 (BPs) 的转变.
- 生物塑料在环境中也会降解为微塑料 (MP).
- 关于从生物塑料中提取的MP的毒性数据有限.
研究的目的:
- 调查聚乳酸微塑料 (PLA-MPs) 对淡水鱼Daphnia magna的不良影响.
- 评估对子个体 (氧化状态,能量储备) 和个体 (游泳活动) 层面的影响.
主要方法:
- 大夫尼亚大被暴露在PLA-MPs的三种度中,持续了21天.
- 亚个体分析包括氧化应激标记 (ROS,酶活性),氧化损伤 (脂质过氧化) 和能量储备 (热量,蛋白质,碳水化合物,脂质含量).
- 个人层面的评估重点是游泳活动 (距离,速度) 的变化.
主要成果:
- 暴露于PLA-MPs导致氧化状态和能量储备的轻微变化.
- 与对照组相比,暴露于PLA-MPs的Daphnia magna中观察到游泳活动显著增加.
- 这些效应表明,PLA-MPs可以诱导类似于传统塑料MP的不良结果.
结论:
- 生物塑料衍生微塑料,特别是PLA-MP,对水生生物构成生态毒理风险.
- 这些发现凸显了对生物塑料污染对环境影响和长期影响的进一步研究的需要.
- 可持续的塑料替代品需要进行彻底的环境风险评估.
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