Separation of false-positive microplastics and analysis of microplastics via a two-phase system combined with confocal Raman spectroscopy

Liu, Yu; Jiang, Wenyan; Liao, Yuying; Sun, Ruikun; Hu, Jiale; Lu, Zifan; Chang, M. C.; Yang, Jingyu; Dai, Zhonghua; Zhou, Chunxia; Hong, Pengzhi; Qian, Zhong‐Ji; Sun, Song; Liu, Ren; Liang, Yan‐Qiu; Zhang, Yueqin; Li, Chengyong

doi:10.1016/j.jhazmat.2022.129803

Cited by 19 publications

(9 citation statements)

References 55 publications

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“…The OCA of PS and PET nanoplastics is ∼0° because they have large amounts of alkyl groups. Therefore, PS and PET nanoplastics exhibit superhydrophobicity and lipophilicity, which is consistent with the literature . Any contact between the solid and liquid phases follows the minimization of the surface free energy .…”

Section: Resultssupporting

confidence: 89%

“…Therefore, PS and PET nanoplastics exhibit superhydrophobicity and lipophilicity, which is consistent with the literature. 27 Any contact between the solid and liquid phases follows the minimization of the surface free energy. 28 According to Young's equation, γ SG = γ SL + γ LG •cos θ, where γ SG is the solid−gas interfacial tension, γ SL is the solid−liquid interfacial tension, and γ LG is the liquid−gas interfacial tension, the overall surface free energy can be minimized only when the γ SL and contact angle (CA) (θ) are minimized.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

“…In the Raman spectra of PS nanoplastics, two dominant peaks at 1001 and 1031 cm −1 are observed, corresponding to the breathing vibration of the C−C ring and the plane deformation vibration of C−H, respectively. 12,27 Meanwhile, Raman peaks of other polymers (e.g., PMMA) are not observed in the Raman spectra (Figure S5). The enhancement effect of PS nanoplastics on the Because different sizes of PS nanoplastics are present in the environment, an equal mixture containing four sizes (20, 100, 500, and 1000 nm) of PS nanoplastics was also analyzed in this study.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Separation and Identification of Nanoplastics via a Two-Phase System Combined with Surface-Enhanced Raman Spectroscopy

Liu,

Lin,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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Nanoplastics, novel environmental pollutants widely dispersed, present challenges due to limited, dependable detection methods, particularly for trace levels. This study introduces a novel approach that integrates liquid-phase self-assembly nanoparticle technology with surface-enhanced Raman spectroscopy (SERS) for the precise detection of nanoplastics. Utilizing hydrophobic−lipophilic interactions and SERS technology, we developed silver nanoparticles (Ag NPs)@poly(methyl methacrylate) (PMMA) films (Ag NPs@ PMMA films) for the efficient extraction and simultaneous detection of polystyrene (PS) and polyethylene terephthalate (PET) nanoplastics at extremely low concentrations (e.g., 10 −11 mg/mL for 20 nm PS nanoplastics and 10 −8 mg/mL for 70 nm PET nanoplastics). It also demonstrates a linear correlation between SERS intensity (y) and the logarithm of nanoplastics' concentration (lg c) at extremely low levels. This technique's applicability extends to real environmental samples, such as seawater, oysters, and bottled water, enabling both qualitative and quantitative detection of PS and PET nanoplastics. For example, it successfully identifies 1.23 × 10 −10 mg/mL PS nanoplastics in seawater samples and 8.61 × 10 −5 mg/ mL PET nanoplastics in bottled-water samples. Overall, these findings provide a reliable basis for trace nanoplastic detection in the environment, addressing a pressing environmental concern.

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Section: Resultssupporting

confidence: 89%

Section: ■ Materials and Methodsmentioning

confidence: 99%

Section: ■ Materials and Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Separation and Identification of Nanoplastics via a Two-Phase System Combined with Surface-Enhanced Raman Spectroscopy

Liu,

Lin,

Yang

et al. 2024

ACS Sustainable Chem. Eng.

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“…Several methods have been explored, such as electrophoresis, 23 thermo-diffusion, 24 convection, 25 and immiscible oil−water interfaces. 26,27 However, these approaches require additional devices and cannot be widely used. Electrokinetic preconcentration technology has been used for rapid separation and preconcentration of samples on the electrode surface.…”

Section: Introductionmentioning

confidence: 99%

“…To solve these problems, selectively concentrating targets on the detection zone is an effective strategy. Several methods have been explored, such as electrophoresis, thermo-diffusion, convection, and immiscible oil–water interfaces. , However, these approaches require additional devices and cannot be widely used. Electrokinetic preconcentration technology has been used for rapid separation and preconcentration of samples on the electrode surface. ,, Yang et al found that molecules could be loaded on the SERS substrate under electrostatic force guidance .…”

Section: Introductionmentioning

confidence: 99%

Aptamer-Modified Porous Anodized Aluminum Substrate for Rapid and Ultrasensitive Detection of Tetracycline via Surface Enhanced Raman Spectroscopy Couple with Electric Field Enrichment

Dai,

He,

Zhou

et al. 2023

ACS Appl. Nano Mater.

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Tetracycline (TC) has broad-spectrum antimicrobial activity and is low cost and widely used in animal disease treatment drugs and feed additives. However, the misuse of tetracycline causes serious damage to ecosystems and poses a major threat to human health. Therefore, the development of rapid and ultrasensitive TC detection methods is of great significance for the effective monitoring and prevention of TC pollution. Here, a surface enhanced Raman spectroscopy (SERS) sensor combined with electric field enrichment technology was developed for rapidly quantitative testing of TC. The SERS sensor was constructed by introducing Ag nanoparticles (AgNPs) and a Raman probe (4aminothiophenol, 4-ATP) on the porous anodized aluminum (PAA) membrane through hybridization of aptamer-2 (Apt-2) with aptamer-1 (Apt-1). In the presence of TC, the SERS tags (4-ATP/AgNPs/Apt-2) dissociate from this sensing platform, attributed to the stronger specific binding of TC to Apt-1, leading to a significant decrease in the Raman signal, which enables indirect quantitative analysis of TC. Based on the ion current property of the composite PAA membrane and the high activity and specificity of the SERS substrate, TC can be rapidly enriched in 1 min by electric field enrichment technology and identified by potable Raman spectrometer in 3 min. The improved SERS sensor allows for a real-time response to 1 fg/mL−1 ng/mL TC, and the limit of detection (LOD) is 1 fg/mL. More importantly, the SERS sensor can be used to detect TC in real food samples (such as milk and shrimp) and has excellent performance. The sensing strategy is very promising for mitigating food security risk.

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A review of recent progress in the application of Raman spectroscopy and SERS detection of microplastics and derivatives

Chen,

Wang,

Yao

et al. 2023

Microchim Acta

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Separation of false-positive microplastics and analysis of microplastics via a two-phase system combined with confocal Raman spectroscopy

Cited by 19 publications

References 55 publications

Separation and Identification of Nanoplastics via a Two-Phase System Combined with Surface-Enhanced Raman Spectroscopy

Separation and Identification of Nanoplastics via a Two-Phase System Combined with Surface-Enhanced Raman Spectroscopy

Aptamer-Modified Porous Anodized Aluminum Substrate for Rapid and Ultrasensitive Detection of Tetracycline via Surface Enhanced Raman Spectroscopy Couple with Electric Field Enrichment

A review of recent progress in the application of Raman spectroscopy and SERS detection of microplastics and derivatives

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