A minimalist approach to quantify emission factor of microplastic by mechanical abrasion

Ren, Shu-Yan; Sun, Qing; Ni, Hong-Gang; Wang, Jianfeng

doi:10.1016/j.chemosphere.2019.125630

Cited by 32 publications

(12 citation statements)

References 14 publications

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“…The issue is exacerbated by poor waste management and the lack of a proper recycling system of the products [ 1 ]. Exposure of plastic products to environmental chemicals, physical and biological conditions shreds the plastics into small pieces of nano plastics and microplastics with the diameter of (<100 nm) and (<5 mm), respectively [ 2 ]. Microplastic can be found in both terrestrial [ 3 ] and marine [ 4 ] environments.…”

Section: Introductionmentioning

confidence: 99%

Retracted: Comparative molecular docking and molecular‐dynamic simulation of wild‐type‐ and mutant carboxylesterase with BTA‐hydrolase for enhanced binding to plastic

Lameh

Baseer

Ashiru

2021

Engineering in Life Sciences

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According to the literature review, microbial degradation of polyethylene terephthalate by PETases has been detected effective and eco-friendly. However, the number of microorganisms capable of such feats is limited with some undesirable bioprospecting results. BTA-hydrolase has been already reported capable of degrading polyethylene terephthalate. Therefore, mutation by in silico sitedirected mutagenesis means to introduce current isomer of PETase for polyethylene terephthalate degradative capability as a better approach to resolve this issue. This study aimed to use in silico site-directed mutagenesis to convert a carboxylesterase from Archaeoglobus fulgidus to BTA-hydrolase from Thermobifida fusca by replacing six amino acids in specific locations. This work was followed by molecular docking analysis with polyethylene terephthalate and polypropylene to compare their interactions. The best-docked enzyme-substrate complex was further subjected to molecular dynamics simulation to gauge the binding quality of the BTA-hydrolase, wild-type and mutant-carboxylesterase with only polyethylene terephthalate as a substrate. Results of molecular docking revealed lowest binding energy for the wild-type carboxylesterase-polypropylene complex (-7.5 kcal/mol). The root-mean-square deviation value was observed stable for BTA-hydrolase. Meanwhile, root-mean-square fluctuation was assessed with higher fluctuation for the mutated residue Lys178. Consequently, the Rg value for BTA-hydrolase-ligand complex (∼1.68 nm) was the lowest compared to the mutant and wild-type carboxylesterase. The collective data conveyed that mutations imparted a minimal change in the ability of the mutant carboxylesterase to bind to polyethylene terephthalate.

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Section: Introductionmentioning

confidence: 99%

Retracted: Comparative molecular docking and molecular‐dynamic simulation of wild‐type‐ and mutant carboxylesterase with BTA‐hydrolase for enhanced binding to plastic

Lameh

Baseer

Ashiru

2021

Engineering in Life Sciences

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“…An increase in the thickness of the contact lenses results in a decrease in their light transmittance, which reduces the release of microplastics. 33 The nominal thickness of the contact lenses in group A is 0.09 mm, which is thinner than the 0.14 mm of the contact lenses in groups B and C, which corresponds to the fact that the contact lenses in group A release more microplastic particles. The release characteristics of microplastics from the contact lenses of different brands are affected by both their chemical composition and thickness.…”

Section: ■ Discussionmentioning

confidence: 92%

“…Contact lenses of the same brand are made of similar materials but differ in their ability to release microplastics, and thickness may be a contributing factor. An increase in the thickness of the contact lenses results in a decrease in their light transmittance, which reduces the release of microplastics . The nominal thickness of the contact lenses in group A is 0.09 mm, which is thinner than the 0.14 mm of the contact lenses in groups B and C, which corresponds to the fact that the contact lenses in group A release more microplastic particles.…”

Section: Discussionmentioning

confidence: 97%

High-Content Screening Discovers Microplastics Released by Contact Lenses under Sunlight

Liu,

Ling,

Jiang

et al. 2023

Environ. Sci. Technol.

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The widespread use of plastic products leads to the ubiquity of microplastics in daily life, while the release of microplastics from long-used contact lenses has not been reported due to the limitations of conventional detection methods. Here, we established a new and rapid method to capture and count microplastics by using a high-content screening system. This method can simultaneously measure the diameter, area, and shape of each plastic particle, and the reliability and applicability of this method were verified with commercial microplastics. It is estimated that 90,698 particles of microplastics could be released from a pair of contact lenses during a year of wearing. The microplastics in the leachates were confirmed to be released from the contact lenses by scanning electron microscopy and Fourier transform infrared spectroscopy fingerprint analysis. Our study reveals an undiscovered pathway of microplastic direct exposure to humans, highlighting the urgent need to assess the potential health risks caused by eye exposure to microplastics.

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“…WSdif mac.apf.j is the annual input of macroplastics (mac) to cropland from agricultural plastic films (apf) in sub-basin (j) (kg/yr); MF j is the mechanical abrasion factor of microplastics from the agricultural plastic films in sub-basin (j) (unitless). We took the averaged mechanical value for polyethylene (PE) and poly(vinyl chloride) (PVC) based on the experimental study of Ren et al 33 Details are presented in Table S4. fr residue.j is the residue rate of macroplastics in soils (0−1).…”

Section: = × ×mentioning

confidence: 99%

The Plastic Age: River Pollution in China from Crop Production and Urbanization

Li,

Zhang,

Baartman

et al. 2023

Environ. Sci. Technol.

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Many rivers are polluted with macro (>5 mm)- and microplastics (<5 mm). We assess plastic pollution in rivers from crop production and urbanization in 395 Chinese sub-basins. We develop and evaluate an integrated model (MARINA-Plastics model, China-1.0) that considers plastics in crop production (plastic films from mulching and greenhouses, diffuse sources), sewage systems (point sources), and mismanaged solid waste (diffuse source). Model results indicated that 716 kton of plastics entered Chinese rivers in 2015. Macroplastics in rivers account for 85% of the total amount of plastics (in mass). Around 71% of this total plastic is from about one-fifth of the basin area. These sub-basins are located in central and eastern China, and they are densely populated with intensive agricultural activities. Agricultural plastic films contribute 20% to plastics in Chinese rivers. Moreover, 65% of plastics are from mismanaged waste in urban and rural areas. Sewage is responsible for the majority of microplastics in rivers. Our study could support the design of plastic pollution control policies and thus contribute to green development in China and elsewhere.

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A minimalist approach to quantify emission factor of microplastic by mechanical abrasion

Cited by 32 publications

References 14 publications

Retracted: Comparative molecular docking and molecular‐dynamic simulation of wild‐type‐ and mutant carboxylesterase with BTA‐hydrolase for enhanced binding to plastic

Retracted: Comparative molecular docking and molecular‐dynamic simulation of wild‐type‐ and mutant carboxylesterase with BTA‐hydrolase for enhanced binding to plastic

High-Content Screening Discovers Microplastics Released by Contact Lenses under Sunlight

The Plastic Age: River Pollution in China from Crop Production and Urbanization

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