来自可生物降解和常规塑料的二次纳米塑料对Streptomyces coelicolor M145的毒性影响的比较研究
Xiaomei Liu1, Shakeel Ahmad2, Jingkang Ma2
1College of Life Sciences, Qufu Normal University, Qufu, Shandong 273165, China; MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Journal of hazardous materials
|August 28, 2023
概括
像PLA和PHA这样的可生物降解塑料比传统塑料释放更多的纳米塑料,对土壤细菌构成短期毒性风险. 然而,这些纳米塑料也令人惊地促进了Streptomyces coelicolor的抗生素生产.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 材料科学 材料科学 材料科学
背景情况:
- 塑料被广泛使用,但造成环境问题.
- 生物降解塑料是替代品,但可能会带来风险.
- 来自塑料的微/纳米塑料是一个新兴的环境问题.
研究的目的:
- 研究可生物降解和传统塑料中纳米塑料的短期毒性.
- 评估这些纳米塑料对Streptomyces coelicolor M145.5的影响.
- 了解对细菌生存和抗生素生产的影响.
主要方法:
- 微塑料 (PLA,PHA,PS) 的降解30天.
- 对Streptomyces coelicolor M145暴露于释放的纳米塑料.
- 细菌生存率和抗生素产量的分析 (ACT,RED).
主要成果:
- PLA和PHA释放的纳米塑料比PS更多.
- PLA和PHA纳米塑料对M145.5具有显著的毒性.
- PS纳米塑料没有显著的毒性.
- 抗生素生产 (ACT,RED) 显著增加,特别是在PLA纳米塑料处理后.
- 与抗生素生产相关的调节基因的表达增加.
结论:
- 可生物降解塑料产生的纳米塑料比传统塑料更多.
- PLA和PHA纳米塑料对S. coelicolor存在短期毒性风险.
- 纳米塑料,特别是来自PLA的纳米塑料,可以刺激S. coelicolor.中的抗生素生产.
- 需要进一步研究可生物降解纳米塑料对生态的影响.
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