Istanbul University, Faculty of Engineering, Department of Chemistry, 34320 Avcılar, Istanbul, Turkey.
Istanbul University, Faculty of Engineering, Department of Chemistry, 34320 Avcılar, Istanbul, Turkey.
Food Chem. 2018 Mar 1;242:301-307. doi: 10.1016/j.foodchem.2017.09.068. Epub 2017 Sep 14.
In the current study, we introduce magnetic solid phase microextraction coupled with electrochemical detection of caffeine. A commercially available disposable screen-printed carbon electrodes modified with poly Alizarin Red S are employed as electrochemical sensors in the detection stage. However, the suitability of magnetic solid phase microextraction for electroanalytical methods such as square wave voltammetry has not been declared. With our optimised conditions in hand, the system response was linearly proportional to the concentration of caffeine in the range of 0.5-20µM with a correlation coefficient of about 0.9987. The detection limit of the sensing system was found to be 0.05µM (a signal-to-noise ratio of 3). At the end of the study, the suitability of this new procedure for the analysis of energy drink, soft drink, and chocolate milk samples was demonstrated.
在当前的研究中，我们引入了磁性固相微萃取结合电化学检测咖啡因。在检测阶段，采用市售的、经聚茜素红 S 修饰的一次性丝网印刷碳电极作为电化学传感器。然而，磁性固相微萃取对于电化学分析方法（如方波伏安法）的适用性尚未得到证实。在我们优化的条件下，该系统的响应与咖啡因在 0.5-20µM 范围内的浓度呈线性比例关系，相关系数约为 0.9987。该传感系统的检测限被发现为 0.05µM（信噪比为 3）。在研究结束时，证明了这种新方法在分析能量饮料、软饮料和巧克力奶样品中的适用性。
