| 张瑛,张春香,姜敏,李钰炫,赵昱昊,周光远.生物基PEF和石油基PET微塑料对微藻生物效应[J].,2023,63(6):567-575 |
| 生物基PEF和石油基PET微塑料对微藻生物效应 |
| Bio-effects of bio-based PEF and fossil-based PET microplastics on microalgae |
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| DOI：10.7511/dllgxb202306003 |
| 中文关键词:生长抑制光合作用胞外聚合物聚2,5-呋喃二甲酸乙二醇酯(PEF)聚对苯二甲酸乙二醇酯(PET) |
| 英文关键词:growth inhibitionphotosynthesisextracellular polymeric substancespolyethylene 2,5-furandicarboxylate (PEF)polyethylene terephthalate (PET) |
| 基金项目:国家自然科学基金资助项目(21477014). |
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| 中文摘要: |
| 微塑料(MPs)对水生生态系统主要生产者微藻的生物效应及其相互作用，目前还没有得到足够的关注．为此以蛋白核小球藻为受试生物，考察聚对苯二甲酸乙二醇酯(PET，石油基塑料)及其替代物聚2,5-呋喃二甲酸乙二醇酯(PEF，生物基塑料)两种MPs对微藻产生的生物效应，并进行比较．结果表明，PEF和PET MPs能够抑制微藻细胞生长及其体内叶绿素的积累，扰乱微藻的抗氧化平衡体系，对活性氧(ROS)的积累及抗氧化酶的活性具有诱导和促进作用．研究还发现，PEF和PET MPs会促进微藻胞外聚合物(EPS)的分泌，降低胞内大分子物质的含量；通过扫描电子显微镜发现许多微藻细胞黏附在粗糙的MPs表面形成异质聚集体．PEF和PET MPs对微藻的生物效应具有一定的差异性，尤其是EPS的分泌方面，PEF MPs对EPS分泌的促进作用大于PET MPs的；从侧面来看，生物基PEF MPs可能具备更好的生物降解性能．研究结果为不同来源(生物基或石油基)MPs的生物效应研究提供了基础数据，为生物基MPs环境风险评估提供了研究基础． |
| 英文摘要: |
| The bio-effects and interactions of microplastics (MPs) on microalgae, the major producers of aquatic ecosystems, have not received enough attention. So Chlorella pyrenoidosa is used as an organism model to investigate and compare the bio-effects of polyethylene terephthalate (PET, fossil-based plastic) MPs and its substitute polyethylene 2,5-furandicarboxylate (PEF, bio-based plastic) MPs on microalgae. The results show that PEF and PET MPs inhibit the growth and chlorophyll accumulation of microalgae cells. Meanwhile, they interfere with the antioxidant balance system of microalgae, and induce the excessive accumulation of reactive oxygen species (ROS) and promote the activities of antioxidant enzymes. It is also found that PEF and PET MPs promote the formation of extracellular polymeric substances (EPS) of microalgae, but reduce the content of intracellular macromolecules. SEM shows that many microalgae cells adhere to the rough surface of MPs and form heterogeneous aggregates. The bio-effects of fossil-based PET MPs on microalgae show difference with that of bio-based PEF MPs, especially on the formation of EPS, wherein PEF MPs show more promotive effect on EPS than PET MPs. This suggests, in other side, that bio-based PEF MPs may be more biodegradable. The research result gives support to the study of bio-effects of MPs from different sources (bio-based or fossil-based), and provides the research basis for the environmental risk assessment of bio-based MPs. |
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