Aggregation kinetics of polystyrene nanoplastics in gastric environments: Effects of plastic properties, solution conditions, and gastric constituents

Shao, Zhiwei; Su, Jiana; Dong, Jiawei; Liang, Miaoting; Xiao, Jie; Liu, Jindie; Zeng, Qiaoying; Li, Yongtao; Huang, Weilin; Chen, Chengyu

doi:10.1016/j.envint.2022.107628

Cited by 12 publications

(2 citation statements)

References 72 publications

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“…The early-stage aggregation kinetics of pristine and 16 day-irradiated NPs over 20 min were determined by time-resolved dynamic light scattering (TR-DLS) following previously established methods. , The aggregation rate constants ( k ) (eq S5) and attachment efficiencies (α) (eq S6) were determined to establish the stability profiles, which were fitted empirically (eq S7) to obtain the critical coagulation concentration (CCC). The aggregation data were fitted with theoretical α values calculated based on Derjaguin–Landau–Verwey–Overbeek (DLVO) theory for derivation of the Hamaker constant ( A PWP ) for each type of pristine or irradiated NPs (eqs S8–S15).…”

Section: Materials and Methodsmentioning

confidence: 99%

Differential Photoaging Effects on Colored Nanoplastics in Aquatic Environments: Physicochemical Properties and Aggregation Kinetics

Su,

Ruan,

Luo

et al. 2023

Environ. Sci. Technol.

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Nanoplastics (NPs) have different colors, which could affect their photoaging processes in aquatic environments. This study investigated the effects of irradiation on physicochemical properties and aggregation kinetics of five colored NPs. Photodegradation rates and photooxidation degrees ranked white ≈ yellow > red > blue ≈ black NPs, indicating that NPs with longer color wavelengths photoaged faster. The discoloration process followed color fading (2–14 days, except for white NPs), yellowing (10–16 days), yellow fading (18 days), and turning transparent (20–22 days). White NPs exhibited a different photoaging sequence (C–H → C–OH → CO → O–CO) from others. Photodegradation was mainly controlled by singlet oxygen, producing 13 chemicals that were mostly organic acids. The overall colloidal stability of pristine NPs ranked blue > yellow > red > black > white. Irradiation for 16 days retarded aggregation of white and other NPs in NaCl solution, raising the critical coagulation concentration (CCC) by 82.14 and 0.85–7.90%, respectively. Contrarily, irradiation promoted aggregation in CaCl2 solution by reducing the CCC of white (67.37%) and other (33.33–37.58%) NPs. The findings demonstrate that colored NPs underwent photoaging processes different from white/transparent NPs, which were focused by previous work, highlighting the important role of color in their environmental fate and transport.

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Section: Materials and Methodsmentioning

confidence: 99%

Differential Photoaging Effects on Colored Nanoplastics in Aquatic Environments: Physicochemical Properties and Aggregation Kinetics

Su,

Ruan,

Luo

et al. 2023

Environ. Sci. Technol.

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“…Observation of Freundlich isotherm suggested that PSNPs highly adsorb gastric lysozyme and other proteins of gastric juice further inducing changes in the protein structure. [ 145 ] The interaction/aggregation kinetics is influenced and modulated by multiple factors enlisted as size of PNPs, chemical composition of PNPs, surface charge of both the protein and PNPs, type of protein, concentration ratio of the peptide‐PNPs, pH, electrolytic composition and concentration, temperature, and presence or absence of other influential substances (Figure 8b) and all these parameters are discussed in detail tin the subsequent sub‐sections.…”

Section: Molecular Insights Into Protein‐pnp Interactionsmentioning

confidence: 99%

Mechanistic Insights into Cellular and Molecular Basis of Protein‐Nanoplastic Interactions

Naidu,

Nagar,

Poluri

2023

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Plastic waste is ubiquitously present across the world, and its nano/sub‐micron analogues (plastic nanoparticles, PNPs), raise severe environmental concerns affecting organisms’ health. Considering the direct and indirect toxic implications of PNPs, their biological impacts are actively being studied; lately, with special emphasis on cellular and molecular mechanistic intricacies. Combinatorial OMICS studies identified proteins as major regulators of PNP mediated cellular toxicity via activation of oxidative enzymes and generation of ROS. Alteration of protein function by PNPs results in DNA damage, organellar dysfunction, and autophagy, thus resulting in inflammation/cell death. The molecular mechanistic basis of these cellular toxic endeavors is fine‐tuned at the level of structural alterations in proteins of physiological relevance. Detailed biophysical studies on such protein‐PNP interactions evidenced prominent modifications in their structural architecture and conformational energy landscape. Another essential aspect of the protein‐PNP interactions includes bioenzymatic plastic degradation perspective, as the interactive units of plastics are essentially nano‐sized. Combining all these attributes of protein‐PNP interactions, the current review comprehensively documented the contemporary understanding of the concerned interactions in the light of cellular, molecular, kinetic/thermodynamic details. Additionally, the applicatory, economical facet of these interactions, PNP biogeochemical cycle and enzymatic advances pertaining to plastic degradation has also been discussed.

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Human Toxicity of Nano‐ and Microplastics

Cruz Salas,

Perez,

Bobadilla

et al. 2024

Toxic Effects of Micro‐ and Nanoplastics

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Aggregation kinetics of polystyrene nanoplastics in gastric environments: Effects of plastic properties, solution conditions, and gastric constituents

Cited by 12 publications

References 72 publications

Differential Photoaging Effects on Colored Nanoplastics in Aquatic Environments: Physicochemical Properties and Aggregation Kinetics

Differential Photoaging Effects on Colored Nanoplastics in Aquatic Environments: Physicochemical Properties and Aggregation Kinetics

Mechanistic Insights into Cellular and Molecular Basis of Protein‐Nanoplastic Interactions

Human Toxicity of Nano‐ and Microplastics

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