<br>聚苯乙烯纳米塑料对微藻四尾栅藻生理生化特性的影响,Environmental Pollution

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聚苯乙烯纳米塑料对微藻四尾栅藻生理生化特性的影响
Environmental Pollution ( IF 7.6 ) Pub Date : 2022-12-30 , DOI: 10.1016/j.envpol.2022.120987
Ru-Ru Li ₁ , Bin-Liang Wang ₁ , Fang-Ru Nan ₁ , Jun-Ping Lv ₁ , Xu-Dong Liu ₁ , Qi Liu ₁ , Jia Feng ₁ , Shu-Lian Xie ₁

Affiliation

微塑料对水生环境的污染已成为全球环境问题。微塑料颗粒可以被粉碎形成更小的纳米塑料，但关于它们对浮游植物，特别是淡水微藻的影响的知识仍然有限。为了研究这个问题，将微藻暴露于五种浓度（10、25、50、100 和 200 mg/L）的聚苯乙烯纳米塑料 (PS-NP) 中。成长；抗氧化酶超氧化物歧化酶（SOD）、过氧化氢酶（CAT）、过氧化物酶（POD）的含量；叶绿素含量；并相应测定可溶性蛋白质和可溶性多糖的浓度。结果表明，随着聚苯乙烯纳米塑料浓度的增加，微藻密度增加，且纳米塑料刺激后藻类的生理特性增强。此外，高浓度（200 mg/L）的纳米塑料增加了叶绿素、可溶性蛋白质和多糖的含量（P < 0.05）。纳米塑料显着激活了四尾栅藻的抗氧化酶活性。最后，我们提出了三种可能的藻类恢复机制，以响应纳米塑料，其中通过细胞壁增厚、内化和聚集来耐受 PS-NP。这项研究的结果有助于了解纳米塑料对淡水微藻的生态风险。

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Effects of polystyrene nanoplastics on the physiological and biochemical characteristics of microalga Scenedesmusquadricauda

The contamination of the aquatic environment with microplastics has become a global environmental concern. Microplastic particles can be shredded to form smaller nanoplastics, and knowledge on their impacts on phytoplankton, especially freshwater microalgae, is still limited. To investigate this issue, the microalga was exposed to polystyrene nanoplastics (PS-NPs) of five concentrations (10, 25, 50, 100, and 200 mg/L). The growth; the contents of antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD); the chlorophyll content; and concentrations of soluble protein and soluble polysaccharide were accordingly measured. The results showed that the microalgal density increased with the increase of the polystyrene nanoplastic concentrations, and the physiological features of alga were enhanced after the stimulation of nanoplastics. Furthermore, a high concentration (200 mg/L) of nanoplastics increased the contents of chlorophyll, soluble protein, and polysaccharide (P < 0.05). The antioxidant enzyme activities of Scenedesmus quadricauda were significantly activated by nanoplastics. Lastly, we propose three possible algal recovery mechanisms in response to nanoplastics in which was tolerant with PS-NPs by cell wall thickening, internalization, and aggregation. The results of this study contribute to understanding of the ecological risks of nanoplastics on freshwater microalgae.

更新日期：2022-12-30

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