处于可检测边缘的纳米塑料：分析极限、转变和对生物降解研究的影响
Nanoplastics at the edge of detectability: Analytical limits, transformation, and implications for biodegradation studies.
摘要(中文译文)
环境纳米塑料（NPs；<1 μm）是塑料碎片中最小、分析难度最大的组分，表现出胶体行为、高比表面积，并且可能比更大的微塑料具有更高的生物摄取潜力。关于其检测的报道在环境和生物基质中日益普遍，但大多数纳米塑料数据仅徘徊在方法检出限附近。对于常规分析流程而言，在复杂样品中对100 nm以下颗粒进行可靠表征仍然困难。本综述评估了纳米塑料分析的最先进技术，包括动态光散射、纳米颗粒追踪分析、可调电阻脉冲传感、场流分离联用多角度光散射、电子显微镜、振动光谱、表面增强拉曼光谱以及热解气相色谱-质谱联用。每种技术都具有独特优势，但也存在偏差和基质限制。没有任何单一方法能够提供关于尺寸、数量、形态和聚合物身份的完整数据。环境老化会改变PET、PE、PP、PS、PVC、PLA和PBAT等聚合物的纳米塑料表面化学、结晶度、聚集性和生物降解性。光氧化、机械破碎、添加剂浸出和生态冠形成可增强或阻碍微生物和酶促降解。实验室研究中的原始模型纳米塑料与风化环境颗粒差异显著，限制了可比性和可重复性。由于表征不足、对照薄弱和灵敏度低，许多生物降解报道混淆了表面风化、破碎、添加剂释放和真正的矿化。我们提出一个三级证据框架，以区分表面修饰、部分解聚和实质性矿化。纳米塑料生物降解最低信息（NBMI）清单标准化了设计和报告。这些工具有助于提高可比性，并加强对纳米塑料归趋和生物降解的证据。
Abstract
Environmental nanoplastics (NPs; <1 μm) are the smallest, most analytically challenging fraction of plastic debris, exhibiting colloidal behavior, high surface-to-volume ratios, and potentially greater biological uptake than larger microplastics. Reports on their detection are increasingly prevalent across environmental and biological matrices, but most NP data hover near method detection limits. Reliable characterization below 100 nm in complex samples remains difficult for routine analytical workflows. This review assesses state of the art techniques for NP analysis, including dynamic light scattering, nanoparticle-tracking analysis, tunable resistive pulse sensing, and field-flow fractionation with multi-angle light scattering, electron microscopy, vibrational spectroscopy, surface-enhanced Raman spectroscopy, and pyrolysis gas chromatography mass spectrometry. Each offers unique strengths yet has biases and matrix limitations. No single method provides complete data on size, number, morphology, and polymer identity. Environmental aging alters NP surface chemistry, crystallinity, aggregation, and biodegradability for polymers like PET, PE, PP, PS, PVC, PLA, and PBAT. Photo-oxidation, mechanical fragmentation, additive leaching, and eco-corona formation can enhance or hinder microbial and enzymatic degradation. Pristine model NPs in lab studies differ sharply from weathered environmental particles, limiting comparability and reproducibility. Many biodegradation reports confuse surface weathering, fragmentation, additive release, and true mineralization due to poor characterization, weak controls, and low sensitivity. We propose a three-tier evidence framework to separate surface modification, partial depolymerization, and substantial mineralization. The Nanoplastic Biodegradation Minimum Information (NBMI) checklist standardizes design and reporting. These tools improve comparability and strengthen evidence on NP fate and biodegradation.
如何引用
AMA
Suleman Shahzad, Sandesh Pandey, Aparna Sharma, Syed Ejaz Hussain Mehdi, Fida Hussain, Ammarah Mushtaq, et al. Nanoplastics at the edge of detectability: Analytical limits, transformation, and implications for biodegradation studies.. Talanta. 2027; doi:10.1016/j.talanta.2026.130197.
APA
Suleman Shahzad, Sandesh Pandey, Aparna Sharma, Syed Ejaz Hussain Mehdi, Fida Hussain, Ammarah Mushtaq, et al (2027). Nanoplastics at the edge of detectability: Analytical limits, transformation, and implications for biodegradation studies.. Talanta. https://doi.org/10.1016/j.talanta.2026.130197
GB/T 7714
Suleman Shahzad, Sandesh Pandey, Aparna Sharma, Syed Ejaz Hussain Mehdi, Fida Hussain, Ammarah Mushtaq, et al. Nanoplastics at the edge of detectability: Analytical limits, transformation, and implications for biodegradation studies.[J]. Talanta, 2027 doi:10.1016/j.talanta.2026.130197.
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