Toxicological Effects of Microplastics and Sulfadiazine on the Microalgae Chlamydomonas reinhardtii

• DOI: 10.3389/fmicb.2022.865768
• Publication Date: 2022-04-28T11:36:05Z
• Authors: Ze Li; Sheng Dong; Fei Huang; Langli Lin; Zhangli Hu; Yihong Zheng
• Keywords: Chlamydomonas reinhardtii; Extracellular polymeric substance

Despite the fact that microplastics (MPs) facilitate adsorption of environmental organic pollutants and influence their toxicity for organisms, more study is needed on combination MPs antibiotics pollutant effects. In this study, polystyrene (1 5 μm) sulfadiazine (SDZ) were examined separately in freshwater microalga, Chlamydomonas reinhardtii. The results suggest both SDZ alone inhibited growth microalgae with an increasing concentration (5-200 mg l-1); however, inhibition rate was reduced by combination. Upon exposure 7 days, algal growth, chlorophyll content, enhanced superoxide dismutase (SOD) activities, whereas glutathione peroxidase (GSH-Px) activity elevated only 1 μm MPs. Fluorescence microscopy scanning electron also indicated particle size contributed to combined aggregating periphery pollutants. Further, amount extracellular secretory protein increased presence removal ratio decreased when coexisted, suggesting affected metabolism microalgae. effect could be mitigated adsorption. These findings provide insight into responses water ecosystems.