Departament of Chemistry, Analytical Chemistry Division, University of La Laguna (ULL), 38206, La Laguna, Tenerife, Spain.
University Institute of Tropical Diseases and Public Health, University of La Laguna (ULL), 38206, La Laguna, Tenerife, Spain.
Mikrochim Acta. 2019 Apr 29;186(5):311. doi: 10.1007/s00604-019-3452-3.
Authors propose a novel braid support configuration for use in solid-phase microextraction (SPME) fibers. Two different braided supports (double and triple) were prepared and compared with the conventional single support configuration. Three kinds of silver-based nanomaterials that serve as coatings on these supports are described. They included silver dendrites, silver nanoparticles (AgNPs), and silver dendrites decorated with AgNPs (Ag-dendrites@AgNPs). They were prepared by electrodeposition, a layer-by-layer (LBL) method, and a hybrid strategy, respectively. Fibers were used in the direct-immersion (DI) mode of SPME. Five polycyclic aromatic hydrocarbons (PAHs) were studied as model analytes by DI-SPME when analyzing (spiked) underground waters. PAHs were further determined with high-performance liquid chromatography (HPLC) and fluorescence detection. The analytical performance of the fibers was compared to that of the commercial polydimethylsiloxane (PDMS) fiber of 100 μm thickness. AgNPs obtained by LBL was the best coating and the double braid was the best support configuration. The configuration of the SPME support always played an important role independently on the coating material, being always beneficial the use of double-braids. Despite the low coatings volumes of the silver-based fibers compared to that of PDMS, the analytical features of the method were adequate. Figures of merit include: (a) limits of detection down to 20 ng·L; (b) intra-day, inter-day, and inter-fiber precisions (expressed as RSDs) of <13%, <12%, and < 13%, respectively; and (c) adequate operational lifetime (>60 extractions). Graphical abstract Schematic presentation of braided solid-phase microextraction support configurations together with different silver-based nanomaterials as coatings.
作者提出了一种用于固相微萃取（SPME）纤维的新型编织支撑配置。制备了两种不同的编织支撑（双编织和三编织）并与传统的单支撑配置进行了比较。描述了三种用作这些支撑涂层的基于银的纳米材料。它们包括银树枝状物、银纳米颗粒（AgNPs）和用 AgNPs 装饰的银树枝状物（Ag-dendrites@AgNPs）。它们分别通过电沉积、层层（LBL）方法和混合策略制备。纤维用于 SPME 的直接浸入（DI）模式。当分析（加标）地下水时，使用 DI-SPME 研究了五种多环芳烃（PAHs）作为模型分析物。PAHs 进一步用高效液相色谱（HPLC）和荧光检测法测定。将纤维的分析性能与 100 µm 厚的商业聚二甲基硅氧烷（PDMS）纤维进行了比较。通过 LBL 获得的 AgNPs 是最佳的涂层，双编织是最佳的支撑配置。SPME 支撑的配置总是独立于涂层材料发挥重要作用，使用双编织总是有益的。尽管与 PDMS 相比，基于银的纤维的涂层体积较低，但该方法的分析特征仍然足够。重要指标包括：（a）检测限低至 20 ng·L；（b）日内、日间和纤维间精密度（以 RSD 表示）分别为 <13%、<12%和 <13%；和（c）足够的操作寿命（>60 次提取）。
