Nutrition, Metabolism and Cardiovascular Research Centre, Institute for Medical Research, National Institutes of Health, Ministry of Health Malaysia, No. 1, Jalan Setia Murni U13/52, Setia Alam, 40170 Shah Alam, Selangor D.E., Malaysia; Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia.
Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia; Institute of Nanoscience and Nanotechnology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia.
Food Chem. 2022 Nov 1;393:133382. doi: 10.1016/j.foodchem.2022.133382. Epub 2022 Jun 2.
In this study, enhancement of electrochemical performance of electrochemically reduced graphene oxide (ERGO) on a screen-printed carbon electrode (SPCE) (ERGO/SPCE) coupled with ion-pairing (cetyltrimethylammonium bromide, CTAB) for the determination of iodide in table salt has been described. The electrode modification of ERGO/SPCE was conducted using cyclic voltammetric (CV) scanning in the potential range of 1.3-0.4 V for 50 cycles after the drop-casting of graphene oxide (GO) suspension on the SPCE. It was found that the electro-active surface area of ERGO/SPCE was increased by 1.5-fold compared to the bare SPCE. ERGO/SPCE sensor displays linearity towards iodide in the concentration range from 0.020 to 1.0 mg/L (sensitivity = 5.40 µA(mg/L), R = 0.9906) with the limit of detection (LOD) and limit of quantitation (LOQ) of 0.070 mg/L and 0.21 mg/L, respectively. The comparison between polarography and ERGO/SPCE sensor was in good agreement.
在这项研究中，描述了将电化学还原氧化石墨烯（ERGO）在丝网印刷碳电极（SPCE）上的电化学性能增强（ERGO/SPCE）与离子配对（十六烷基三甲基溴化铵，CTAB）相结合，用于测定食盐中的碘化物。通过在 SPCE 上滴涂氧化石墨烯（GO）悬浮液后，在 1.3-0.4 V 的电位范围内进行 50 个循环的循环伏安（CV）扫描，对 ERGO/SPCE 进行了电极修饰。结果发现，与裸 SPCE 相比，ERGO/SPCE 的电活性表面积增加了 1.5 倍。ERGO/SPCE 传感器对碘化物的浓度范围在 0.020 至 1.0 mg/L 之间呈现线性关系（灵敏度=5.40 µA(mg/L)，R=0.9906），检测限（LOD）和定量限（LOQ）分别为 0.070 mg/L 和 0.21 mg/L。极谱法和 ERGO/SPCE 传感器之间的比较具有良好的一致性。
