Hongwu Wang,Yanqing Liu,Gengxin Hu,Yinjian Ye,Lingling Pan,Peijie Zhu,Su Yao
In this study, two kinds of ordered mesoporous carbon (OMC) were used as modified electrode materials for fabrication electrochemical sensors (ECSs). CMK-8 and CMK-3 of mesoporous structures own large specific surface areas of 519.5 m 2 /g and 285.0 m 2 /g, respectively. The ECSs displayed excellent catalytic performance toward to the electrochemical reduction of carbadox (CBX). 390-Fold and 15-fold of peak current increase can be obtained from CMK-8/GE and CMK-3/GE modified electrodes, respectively, as compared with bare gold electrode. Under optimum conditions, the CMK-8/GE exhibited a wide linear range (0.5 nM to 500 nM) and extremely low detection limit of about 74 pM for detection of CBX. However, the CMK-3/GE exhibited a wide linear range (100 nM to 5000 nM) and excellent detection limit of about 12 nM. The ECS has succeeded in the electrochemical determination of CBX in spikes. The study dedicates that CMK-8 has more excellent electro-catalytic performance than CMK-3 for electro-catalysis of CBX.
In this work, a tetraphenylmethane porous organic framework ( TPOF ) membrane was prepared by mixing fluorescent TPOF into poly (vinylidene fluoride) (PVDF). Combining the advantages of membrane and TPOF , the TPOF membrane exhibited a continuous porous structure , good flexibility, hydrophobic properties and excellent fluorescence performance. Owing to the remarkable selectivity towards quinoxalines , the TPOF membrane was used as a fluorescence sensor for rapid quinoxalines analysis. The mechanism of the TPOF selectivity was studied by density functional theory (DFT) calculation experiments. Compared to other growth promoting drugs, the lowest unoccupied molecular orbital (LUMO) energy state difference between TPOF and quinoxalines was the largest. The linear ranges for the determination of carbadox and olaquindox were 0.3–20.0 and 0.6–20.0 μmol/L with the correlation coefficients (R 2 ) of 0.9904 and 0.9943, respectively. The limit of detection (LOD, S/N = 3) were 96 and 182 nmol/L , respectively. Furthermore, this fluorescence sensor was used for olaquindox determination in feed samples, and the recoveries were varied from 97.4% to 107.7%. The results obtained by the proposed fluorescence method showed a good agreement with that obtained from HPLC method. Overall, this fluorescence sensor has been confirmed excellent performance in the quinoxalines analysis, which reveals extensive application in rapid residual quinoxalines analysis in feed samples.
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