石墨烯修饰电极上油橄榄酒中羟基酪醇类多酚检测研究

Hydroxytyrosol Polyphenol Detection in Olive Wine Based on Graphene Modified Electrode

采用化学还原法,制备了功能化的石墨烯及纯石墨烯,构建了双层石墨烯修饰电极用于橄榄酒中羟基酪醇类双酚物质的灵敏检测,修饰电极对羟基酪醇类双酚物质的吸附及石墨烯的高导电性使其表现出良好的电化学活性.电极反应动力学研究表明,羟基酪醇类双酚物质在该修饰电极表面经历了一个受扩散控制的准可逆过程.实验结果表明,在最优试验条件下,邻苯二酚的还原峰电流与其浓度在1×10-7~5×10-5mol/L范围内呈良好的线性关系,可实现实际样品橄榄酒中羟基酪醇的灵敏快速检测.

This paper uses the chemical reduction method to prepare the functionalized graphene and pure graphene. The bi-layer graphene modified electrode is constructed for sensitivie detection of hydroxytyrosol polyphenol in olive wine. Due to the adsorption of hydroxytyrosol polyphenol on the modified electrode surface and high electric conductivity of the graphene,the hydroxytyrosol polyphenol exhibits good electrochemical activity. The study of the electrode reaction kinetics indicates that the hydroxytyrosol polyphenol has undergone a diffusion-controlled quasi-reversible process on the modified electrode surface. Under the optimized experimental condition,the reduction peak current of catechol shows a good linear relationship with its concentration from 1 × 10- 7to 5 × 10- 5mol / L,which can be used for rapid detection of hydroxytyrosol polyphenol in real olive wine sample.