Natarajan Thiyagarajan, Gopinathan Manavalan, Thiruppathi Murugan, Adeniyi Omotayo, Chang Jen-Lin, Zen Jyh-Myng, Tesfalidet Solomon, Mikkola Jyri-Pekka
Institute of Chemistry, Academia Sinica, Nangang, Taipei 11529, Taiwan.
Technical Chemistry, Department of Chemistry, Chemical-Biological Centre, Umeå University, SE-901 87 Umeå, Sweden.
Food Chem X. 2023 Mar 22;18:100658. doi: 10.1016/j.fochx.2023.100658. eCollection 2023 Jun 30.
A single run approach for rapid detection of nitrification inhibitor, dicyandiamide (DCD) using electrogenerated chlorine assisted polymerization through azo bond, under acidic conditions and at a preanodized screen printed carbon electrode (SPCE*) is presented. The role of chloride containing support electrolyte in acidic medium along with oxygen functionalities/edge sites are found to be crucial for the successful oxidative polymerization and subsequent adsorption of oxidized products on the electrode surface. The SEM, cyclic voltammetry and X-ray photoelectron spectroscopy studies were used to characterize the polymer film formation. The system exhibited a linear range between 20 and 170 μM with a detection limit of 3 μM (S/N = 3). The method was successfully tested for the detection of DCD in dairy and water samples. Simultaneous detection of DCD in the presence of melamine has also been demonstrated.
本文提出了一种单步运行方法，用于在酸性条件下，在预阳极氧化的丝网印刷碳电极（SPCE*）上，通过偶氮键利用电生氯辅助聚合快速检测硝化抑制剂双氰胺（DCD）。发现在酸性介质中含氯化物的支持电解质以及氧官能团/边缘位点对于成功的氧化聚合以及随后氧化产物在电极表面的吸附至关重要。利用扫描电子显微镜、循环伏安法和X射线光电子能谱研究对聚合物膜的形成进行了表征。该系统的线性范围为20至170μM，检测限为3μM（信噪比=3）。该方法已成功用于检测乳制品和水样中的DCD。同时也证明了在三聚氰胺存在下可同时检测DCD。
