School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu Province, PR China.
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, Jiangsu Province, PR China.
Talanta. 2020 Dec 1;220:121388. doi: 10.1016/j.talanta.2020.121388. Epub 2020 Jul 11.
In this work, an assay with high sensitivity and selectivity for the detection of formaldehyde (FA) is presented. The assay applied a gold nanoprism/Tollens' reagent (Au-np/TR) complex as the sensor used in headspace single-drop microextraction (HS-SDME). A surface plasmon resonance signal enhancement as well as color change was caused by the formation of Au@Ag-np after a redox reaction between FA and TR during the HS-SDME process. With the utilization of smartphone nanocolorimetry (SNC), the FA could be detected and quantified. For HS-SDME-SNC, a linearity calibration curve ranging from 0.1 to 100 μM was obtained, and the limit of detection was determined to be 30 nM. Successful attempts to determine FA were demonstrated by analysis of the analyte in (adulterated) raw food samples (octopus and chicken flesh). Matrix effects from real samples were avoided by using HS-SDME, and only a 3-μL droplet of solvent was needed in the assay.
在这项工作中，提出了一种用于检测甲醛（FA）的高灵敏度和选择性的测定法。该测定法应用金纳米棱镜/托伦斯试剂（Au-np/TR）复合物作为顶空单滴微萃取（HS-SDME）中使用的传感器。在 HS-SDME 过程中，FA 与 TR 之间发生氧化还原反应后，形成 Au@Ag-np，导致表面等离子体共振信号增强和颜色变化。利用智能手机纳米比色法（SNC），可以检测和定量 FA。对于 HS-SDME-SNC，获得了从 0.1 到 100 μM 的线性校准曲线，检测限确定为 30 nM。通过分析（掺假）原始食物样品（章鱼和鸡肉）中的分析物，成功尝试了对 FA 的测定。通过 HS-SDME 避免了实际样品的基质效应，并且测定法仅需要 3 μL 的溶剂液滴。
