Exploring Different Toxic Effects of UV-Aged and Bio-Aged Microplastics on Growth and Oxidative Stress of Escherichia coli.

IF 4.1 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Toxics Pub Date : 2025-08-22 DOI:10.3390/toxics13090706

Juntong Gao, Qimeng Yang, Xiarui Fan, Xinwei Zhou, Peng Ren

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引用次数: 0

Abstract

Toxicological effects of microplastics (MPs) have been confirmed in a variety of microorganisms in aquatic environments, and they are closely correlated with the physicochemical properties of the MPs. In a natural environment, different aging treatments always induce different alterations in the physicochemical properties of MPs, thus influencing their environmental behaviors and biotoxicity. In this work, physicochemical properties and toxicity towards Escherichia coli (E. coli) were investigated in polystyrene (PS) MPs (3 and 10 μm) before and after aging by UV irradiation and biofilm formation, respectively. The results show that UV irradiation and biofilm formation led to different alterations in the surface morphologies and functional groups of PS. The UV-aged 3 μm PS had the strongest inhibitory effect on E. coli growth, and the bio-aged 10 μm PS had the strongest beneficial effect on E. coli growth. Also, the ATPase activity, production of intercellular ROS, and MDA content of the E. coli were affected differently. UV aging enhanced the toxicity of PS towards E. coli, while bio-aging had an opposite weakening effect. Overall, our research verified the remarkable differences in the physicochemical properties and biotoxicity of PS induced by UV aging and bio-aging.

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探讨紫外线老化和生物老化微塑料对大肠杆菌生长和氧化应激的不同毒性作用。

微塑料（MPs）的毒理学效应已在水生环境中多种微生物中得到证实，其毒理学效应与微塑料的理化性质密切相关。在自然环境中，不同的老化处理会引起MPs理化性质的不同变化，从而影响其环境行为和生物毒性。本文研究了聚苯乙烯（PS） MPs （3 μm和10 μm）在紫外线照射和形成生物膜老化前后的理化性质和对大肠杆菌的毒性。结果表明，UV照射和生物膜的形成导致PS表面形态和官能团发生不同程度的变化，其中3 μm UV老化的PS对大肠杆菌生长的抑制作用最强，10 μm生物老化的PS对大肠杆菌生长的促进作用最强。此外，三磷酸腺苷酶活性、细胞间活性氧的产生和丙二醛含量也受到不同程度的影响。紫外线老化增强了PS对大肠杆菌的毒性，而生物老化则相反。综上所述，我们的研究证实了紫外光老化和生物老化在PS的理化性质和生物毒性方面的显著差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Toxics Chemical Engineering-Chemical Health and Safety

CiteScore

4.50

自引率

10.90%

发文量

681

审稿时长

6 weeks

期刊介绍： Toxics (ISSN 2305-6304) is an international, peer-reviewed, open access journal which provides an advanced forum for studies related to all aspects of toxic chemicals and materials. It publishes reviews, regular research papers, and short communications. Our aim is to encourage scientists to publish their experimental and theoretical results in detail. There is, therefore, no restriction on the maximum length of the papers, although authors should write their papers in a clear and concise way. The full experimental details must be provided so that the results can be reproduced. Electronic files or software regarding the full details of calculations and experimental procedure can be deposited as supplementary material, if it is not possible to publish them along with the text.