School of Food and Environment, Dalian University of Technology, Panjin, 124221, China.
Bull Environ Contam Toxicol. 2021 Oct;107(4):626-632. doi: 10.1007/s00128-021-03215-6. Epub 2021 Apr 16.
The toxicity of polystyrene (PS) particles of different sizes was investigated using Gram-negative Escherichia coli and Gram-positive Bacillus cereus. PS particles could inhibit the cell growth of E. coli but promote the cell growth of B. cereus, and this difference might be attributed to different composition in their cell walls and the different interactions between the two bacteria and PS particles. Direct adhesion of E. coli cells on the surface of 5 μm PS microbeads by flagella was observed, indicating the putative role of E. coli on biofilm formation of plastisphere. The regulations of malondialdehyde, lactate dehydrogenase and glutathione were similar between the two bacteria, so the difference in the toxicity effect of PS between the two bacteria was not caused by the antioxidant activity. The overall results of the present study could help to understand the responses of different bacteria to microplastic exposure.
采用革兰氏阴性大肠杆菌和革兰氏阳性蜡状芽孢杆菌研究了不同粒径的聚苯乙烯（PS）颗粒的毒性。PS 颗粒可以抑制大肠杆菌的细胞生长，但促进蜡状芽孢杆菌的细胞生长，这种差异可能归因于它们细胞壁的不同组成以及两种细菌与 PS 颗粒之间的不同相互作用。观察到大肠杆菌细胞通过鞭毛直接黏附在 5μm PS 微珠的表面，这表明大肠杆菌在塑料表面生物膜形成中可能发挥作用。两种细菌的丙二醛、乳酸脱氢酶和谷胱甘肽的含量规律相似，因此两种细菌对 PS 毒性效应的差异不是由抗氧化活性引起的。本研究的综合结果有助于了解不同细菌对微塑料暴露的反应。
