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Unveiling the residual plastics and produced toxicity during biodegradation of polyethylene (PE), polystyrene (PS), and polyvinyl chloride (PVC) microplastics by mealworms (Larvae of Tenebrio molitor)

文献类型： 外文期刊

作者： Sun, Ying 1 ; Zhang, Xu 1 ; Sun, Jingjing 1 ; Xu, Yazhou 2 ; Xiao, Shaoze 1 ; Chen, Jiabin 1 ; Zhou, Xuefei 1 ; Zhang, Yalei 1 ;

作者机构： 1.Tongji Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China

2.Tongji Univ, Natl Engn Res Ctr Protected Agr, Shanghai Engn Res Ctr Protected Agr, Shanghai 200092, Peoples R China

3.Shanghai Acad Agr Sci, Ecoenvironm Protect Res Inst, Shanghai 201403, Peoples R China

关键词： Biofragmentation; Biodegradation; Mealworms; Microplastics; Oxidative stress

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：13.6； 五年影响因子：12.7 ）

ISSN： 0304-3894

年卷期： 2023 年 452 卷

页码：

收录情况： SCI

摘要： Evidence for plastic degradation by mealworms has been reported. However, little is known about the residual plastics derived from incomplete digestion during mealworm-mediated plastic biodegradation. We herein reveal the residual plastic particles and toxicity produced during mealworm-mediated biodegradation of the three most common microplastics, i.e., polyethylene (PE), polystyrene (PS), and polyvinyl chloride (PVC). All three microplastics are effectively depolymerized and biodegraded. We discover that the PVC-fed mealworms exhibit the lowest survival rate (81.3 +/- 1.5%) and the highest body weight reduction (15.1 +/- 1.1%) among the experimental groups by the end of the 24-day experiment. We also demonstrate that the residual PVC micro -plastic particles are more difficult to depurate and excrete for the mealworms compared to the residual PE and PS particles by using laser direct infrared spectrometry. The levels of oxidative stress responses, including reactive oxygen species, antioxidant enzyme activities, and lipid peroxidation, are also highest in the PVC-fed mealworms. Sub-micron microplastics and small microplastics are found in the frass of mealworms fed with PE, PS, and PVC, with the smallest particles detected at diameters of 5.0, 4.0, and 5.9 mu m, respectively. Our findings provide insights into the residual microplastics and microplastic-induced stress responses in macroinvertebrates under micro(nano)plastics exposure.

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