Ya Yu.,China Academy of Safety Science and Technology |
Ya Yu.,Quality Inspection and Test Center for Sugarcane and Its Product |
Wang T.,China Academy of Safety Science and Technology |
Wang T.,Quality Inspection and Test Center for Sugarcane and Its Product |
And 10 more authors.
Analytical Methods | Year: 2015
A simple, highly sensitive electrochemical sensor based on a pyrrolidinium ionic liquid (PIL) modified ordered mesoporous carbon (OMC) paste electrode (PIL/OMCPE) was developed for the determination of carbendazim by differential pulse voltammetry. The structure of the synthesized OMC was characterized by transmission electron microscopy. The electrochemical characteristics of the modified electrodes were investigated using [Fe(CN)6]3-/4- as the electrochemical probe. Compared with other electrodes, the PIL/OMCPE exhibited a larger electrode surface and a faster electron-transfer rate. The electrochemical behavior of carbendazim at the modified electrode was investigated by cyclic voltammetry. The PIL/OMCPE exhibited good performance for the electrochemical oxidation of carbendazim. The peak current of carbendazim at the PIL/OMCPE significantly increased in comparison with those at the bare carbon paste electrode (CPE), OMCPE, and PIL modified CPE. Under optimal conditions, the relationship between the carbendazim concentration and peak current was studied, and the developed PIL/OMCPE sensor exhibited good linearity in a wide range from 1.25 to 800 μg L-1. The limit of detection was estimated to be 0.500 μg L-1 (signal-to-noise ratio = 3). The proposed sensor was successfully applied for the determination of carbendazim in sugarcane samples with satisfactory results. © 2015 The Royal Society of Chemistry.
PubMed | Quality Inspection and Test Center for Sugarcane and Its Product
Type: | Journal: Colloids and surfaces. B, Biointerfaces | Year: 2012
Mesoporous silica (MS) and amino-functionalized mesoporous silica (NH(2)-FMS) were prepared and characterized using the techniques of transmission electron microscopy (TEM) and nitrogen adsorption-desorption. Voltammetry was used to investigate the electrochemical behavior of capsaicin at the amino-functionalized mesoporous silica, which was modified through carbon paste electrode (NH(2)-FMS/CPE). NH(2)-FMS/CPE showed better performance for the electrochemical oxidation of capsaicin, when compared with bare carbon paste electrode (CPE) and mesoporous silica modified carbon paste electrode (MS/CPE). We optimized the experimental conditions influencing the determination of capsaicin. Under optimal conditions, the oxidation peak current was proportional to capsaicin concentration in the range of 0.040-0.40 mol L(-1)and 0.40-4.0 mol L(-1), when the detection limit was 0.020 mol L(-1) (S/N=3). The above method was successfully applied to determine capsaicin in hot pepper samples, yielding satisfactory results. The spiked recoveries were in the range of 93.1-100.7%.