载银纳米纤维素纤维作为一种用于苹果中农药检测的 SERS 平台。
Cellulose nanofibers coated with silver nanoparticles as a SERS platform for detection of pesticides in apples.
机构信息
Food Science Program, Division of Food System & Bioengineering, University of Missouri, Columbia, MO, 65211-5160, USA.
Department of Food Science & Technology, University of Georgia, Athens, GA, 30602-7610, USA.
出版信息
Carbohydr Polym. 2017 Feb 10;157:643-650. doi: 10.1016/j.carbpol.2016.10.031. Epub 2016 Oct 15.
A nanocomposite based on cellulose nanofibers (CNFs) coated with silver nanoparticles (AgNPs) was developed in this study as a flexible and effective substrate for use in surface-enhanced Raman spectroscopy (SERS) analysis. An effective Raman indicator molecule, 4-aminothiophenol (pATP), was used to characterize AgNPs impregnated on CNFs. The CNF-AgNP films were used in SERS analysis to detect thiabendazole (TBZ) pesticides in apples. The influence of pH on the SERS spectra of TBZ was investigated because TBZ is a neutral molecule that has a low affinity for AgNPs. The pH of TBZ solution was decreased to below the TBZ's pK, thus enabling the electrostatic attraction between TBZ and AgNPs. CNFs can prevent the uncontrolled aggregation of AgNPs in low pH environment and serve as an effective AgNP/nanocellulose platform for SERS analysis. Results of this study demonstrate that CNF-AgNP nanocomposites can be used to rapidly detect TBZ pesticides in various food products.
本研究制备了一种基于纤维素纳米纤维（CNFs）的纳米复合材料，其表面涂覆有银纳米粒子（AgNPs），用作表面增强拉曼光谱（SERS）分析的柔性有效基底。使用有效拉曼指示剂分子 4-巯基苯胺（pATP）来表征浸渍在 CNFs 上的 AgNPs。将 CNF-AgNP 薄膜用于 SERS 分析，以检测苹果中的噻菌灵（TBZ）农药。研究了 pH 值对 TBZ 的 SERS 光谱的影响，因为 TBZ 是一种中性分子，与 AgNPs 的亲和力较低。TBZ 溶液的 pH 值降低到低于 TBZ 的 pK 值以下，从而使 TBZ 和 AgNPs 之间产生静电吸引力。CNFs 可以防止 AgNPs 在低 pH 环境下的失控聚集，并作为 SERS 分析的有效 AgNP/纳米纤维素平台。本研究的结果表明，CNF-AgNP 纳米复合材料可用于快速检测各种食品中的 TBZ 农药。
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