Grupo de Estudos de Processos Eletroquímicos e Eletroanalíticos, Universidade Federal de Santa Catarina, Campus Universitário Reitor João David Ferreira Lima, Departamento de Química -CFM, 88040-900, Florianópolis, SC, Brazil.
Grupo de Estudos de Processos Eletroquímicos e Eletroanalíticos, Universidade Federal de Santa Catarina, Campus Universitário Reitor João David Ferreira Lima, Departamento de Química -CFM, 88040-900, Florianópolis, SC, Brazil.
Talanta. 2023 Jan 15;252:123836. doi: 10.1016/j.talanta.2022.123836. Epub 2022 Aug 13.
A glassy carbon electrode was modified with nitrogen and sulfur co-doped graphene quantum dots immobilized in chitosan for the monitoring of multivitamins. The graphene quantum dots were synthesized using a simple citric acid/l-cysteine pyrolysis procedure. The co-doping with nitrogen and sulfur in the graphene matrix was confirmed by spectroscopic techniques. Electron microscopy results showed that the synthesized quantum dots had a diameter of 3.4 ± 1.4 nm. Electrochemical techniques showed excellent current responses to vitamin oxidation provided by the modified electrode compared to the bare electrode. The parameters of square wave voltammetry were optimized in order to obtain the best current responses and to study the electrochemical oxidation of vitamins. The calibration plots for vitamins B, B and B were constructed in 0.1 mol L sodium acetate buffer (pH 5.0) with limits of detection of 0.30, 30.1 and 0.32 nmol L, respectively. Lastly, the modified electrode was effectively implemented in the quantification of vitamins in classic and fruit-based energy drink samples.
一种氮硫共掺杂石墨烯量子点固定在壳聚糖中的玻碳电极被用于多维生素的监测。石墨烯量子点是通过简单的柠檬酸/L-半胱氨酸热解程序合成的。通过光谱技术证实了石墨烯基质中氮和硫的共掺杂。电子显微镜结果表明，合成的量子点的直径为 3.4±1.4nm。与裸电极相比，电化学技术显示出修饰电极对维生素氧化提供的出色电流响应。为了获得最佳的电流响应并研究维生素的电化学氧化，优化了方波伏安法的参数。在 0.1mol L 乙酸钠缓冲液（pH 5.0）中构建了维生素 B、B 和 B 的校准曲线，检测限分别为 0.30、30.1 和 0.32nmol L。最后，修饰电极有效地用于经典和水果基能量饮料样品中维生素的定量。
