Key Laboratory of Child Development and Learning Science, Ministry of Education, Research Center For Learning Science, School of Biological Sciences & Medical Engineering, Southeast University, Nanjing 210096, China.
Key Laboratory of Environmental Medicine and Engineering (Ministry of Education), School of Public Health, Southeast University, Nanjing 210096, China.
Food Chem. 2021 Jun 15;347:129026. doi: 10.1016/j.foodchem.2021.129026. Epub 2021 Jan 9.
Based on packed-fiber solid-phase extraction and HPLC-DAD, a simple analytical method for the determination of seven synthetic dyes has been successfully developed. Polystyrene/polypyrrole (PS/PPy) fibers were obtained via electro-spinning of polystyrene skeletal nanofibers, followed by the oxidation with FeCl to trigger the polymerization of pyrrole and the deposition of polypyrrole coatings on PS fibrous skeleton fibers. The relationship between the extraction performance of the fibers and the electrospinning process at different humidities was investigated based on morphologic study and BET surface area. In the extraction process, purification, concentration, and desorption could be accomplished in one step. The established method exhibited good sensitivity, selectivity, reproducibility, and good efficiency for synthetic dyes in casual snacks (preserved fruit, flavored yogurt, and fruity hard candy) samples. With optimal conditions, the LODs (S/N = 3) were 2.4 to 21.09 ng mL, and linearities were acceptable in liquid matrix and solid matrices. The recoveries were 93.9-103.9%.
基于填充纤维固相萃取和 HPLC-DAD，成功开发了一种简单的分析方法，用于测定七种合成染料。聚苯乙烯/聚吡咯（PS/PPy）纤维通过静电纺丝聚苯乙烯骨架纳米纤维获得，然后用 FeCl 氧化引发吡咯聚合，在 PS 纤维状骨架纤维上沉积聚吡咯涂层。基于形态研究和 BET 表面积，研究了纤维的萃取性能与不同湿度下的静电纺丝过程之间的关系。在萃取过程中，可以一步完成净化、浓缩和洗脱。该方法在休闲小吃（蜜饯、风味酸奶和水果硬糖）样品中对合成染料具有良好的灵敏度、选择性、重现性和良好的效率。在最佳条件下，LOD（S/N=3）为 2.4 至 21.09ng mL，在液体基质和固体基质中具有可接受的线性度。回收率为 93.9-103.9%。
