Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Key Laboratory of Chemical Utilization of Plant Resources of Nanchang, College of Science, Jiangxi Agricultural University, Nanchang, 330045, People's Republic of China.
College of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273165, Shandong, People's Republic of China.
Mikrochim Acta. 2020 Apr 4;187(5):258. doi: 10.1007/s00604-020-04238-2.
Flower-like graphene/CuO@Cu-BTC (GR/CuO@Cu-BTC) composite was employed as electrode material for the voltammetric determination of caffeic acid (CA) in the wine. The composite material was prepared via the self-template method. In this synthetic process, budlike CuO not only acts as the template, but also provides Cu ions for in situ growth of the Cu-BTC shell. The utilization of GR as petal greatly boosts the stability and electronic conductivity of CuO@Cu-BTC. The GR/CuO@Cu-BTC composite possesses unique structural features with high specific surface area and good conductivity, exhibiting excellent electrocatalytic activity towards the oxidation of CA. Under optimized conditions, the sensor shows a good linear response to CA concentration over the range 0.020-10.0 μM, together with a low limit of detection (LOD) of 7.0 nM. Selectivity, reproducibility, and stability were investigated, and the method has been applied for the determination of CA in wine samples. Graphical abstract Schematic representation of electrochemical sensor for the detection of caffeic acid was designed based on flower-like graphene/copper oxide@copper(II) metal-organic framework (GR/CuO@Cu-BTC) composite electrode material.
花状石墨烯/CuO@Cu-BTC（GR/CuO@Cu-BTC）复合材料被用作电极材料，用于葡萄酒中咖啡酸（CA）的伏安法测定。该复合材料是通过自模板法制备的。在这个合成过程中，芽状的 CuO 不仅充当模板，还为 Cu-BTC 壳的原位生长提供了 Cu 离子。GR 的花瓣的使用极大地提高了 CuO@Cu-BTC 的稳定性和电子导电性。GR/CuO@Cu-BTC 复合材料具有独特的结构特征，比表面积高，导电性好，对 CA 的氧化具有优异的电催化活性。在优化条件下，传感器对 CA 浓度在 0.020-10.0 μM 范围内呈现良好的线性响应，检测限（LOD）低至 7.0 nM。考察了选择性、重现性和稳定性，并将该方法应用于葡萄酒样品中 CA 的测定。
