Screening of silver nanoparticles in antibacterial products by leveraging a silver nanowire membrane as a filter and amplifier,Environmental Science: Nano

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Screening of silver nanoparticles in antibacterial products by leveraging a silver nanowire membrane as a filter and amplifier
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2022-07-11 , DOI: 10.1039/d2en00405d
Qing Yang ₁ , Shaoying Zhang ₁ , Shouqing Ni ₂ , Yongchao Lai ₃ , Jinhua Zhan ₁

Affiliation

The wide application of consumer goods containing silver nanoparticles (AgNPs) inevitably increases the accumulation of AgNPs in the environment and human exposure risk, which leads to an urgent need for accurate and efficient analytical methods to detect AgNPs. Herein, we proposed a filtration-based SERS method for sensitive and selective analysis of AgNPs. By adding Raman probe molecules (4-amino thiophenol) that can bind the surface of AgNPs, AgNPs can be identified by the characteristic signal of the probe and AgNP complexes. To improve the detection ability, an iodide-modified silver nanowire (AgNWs) membrane was chosen as a filter to separate and enrich AgNPs. Meanwhile, the signal intensity can be amplified due to the electromagnetic field interaction between AgNPs and AgNWs. Different types of AgNPs (coated with citrate, hydroxylamine hydrochloride and polyvinylpyrrolidone) can be detected and identified from other Ag species by the proposed method. Raman mapping was also performed on the membrane to obtain the distribution information of citrate-AgNPs with concentrations from 10⁻¹ to 10⁻⁶ mg mL⁻¹. A linear relationship (R² = 0.998) between signal intensity and citrate-AgNP concentration indicates the possibility of quantification. Furthermore, AgNPs in antibacterial products without purification were successfully and efficiently detected by the proposed method. This work demonstrated the ability of the filtration-based SERS platform for analysing trace AgNPs in consumer goods.

中文翻译：

利用银纳米线膜作为过滤器和放大器筛选抗菌产品中的银纳米粒子

含银纳米粒子（AgNPs）的消费品的广泛应用不可避免地增加了AgNPs在环境中的积累和人体暴露风险，这导致迫切需要准确有效的分析方法来检测AgNPs。在此，我们提出了一种基于过滤的 SERS 方法，用于对 AgNPs 进行灵敏和选择性分析。通过添加可以结合AgNPs表面的拉曼探针分子（4-氨基苯硫酚），可以通过探针和AgNP复合物的特征信号来识别AgNPs。为了提高检测能力，碘化修饰的银纳米线 (AgNWs) 膜被选为过滤器来分离和富集 AgNPs。同时，由于 AgNPs 和 AgNWs 之间的电磁场相互作用，可以放大信号强度。不同类型的 AgNPs（涂有柠檬酸盐，盐酸羟胺和聚乙烯吡咯烷酮）可以通过所提出的方法从其他银物种中检测和鉴定。还在膜上进行拉曼映射以获得浓度为 10 的柠檬酸盐-AgNPs 的分布信息^-1至 10^-6毫克毫升^-1。信号强度和柠檬酸盐-AgNP 浓度之间的线性关系 ( R ² = 0.998) 表明了量化的可能性。此外，通过所提出的方法成功且有效地检测了未经纯化的抗菌产品中的AgNPs。这项工作证明了基于过滤的 SERS 平台分析消费品中痕量 AgNPs 的能力。

更新日期：2022-07-15

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