|
Abstract
|
Melamine, a kind of triazine analogue with three amino groups. is widely used as an industrial chemical in the production of melamine resins. lvlelamine can be found as a contaminant in a variety of foods from food—contact materials. Wlten added to milk powder. melamine increases the nitrogen concentration, which suggests a false increase in protein concentration. When meeting strong acids or alkali, melamine yields ammeline. ammelide and cyanuric acid by hydrolysis. Melamine could fD1‘tTl insoluble complexes with cyanuric acid, depending on urine pH, which could lead to crystallization and subsequent tissue injury, such as urolithiasis and bladder cancer [l]. Up to now, some methods, such as gas chromatography, high performance liquid chromatography, surface enhanced raman spectroscopy and capillary zone electrophoresisfmass spectrum have been employed for the determination of melamine [2]. However, complicated preconcentration, time-consuming steps and high-cost instruments limit the application of die existing medtods. Compared to those existing methods, much importance has been attached to the electrochemical sensors due to their simplicity, low-cost. accurateness. sensitivity and high stability. In this study, an electrode, modified with nano silica, was introduced for the indirect measurement of melamine using terricyanide probe and differential pulse anodic stripping voltammetry technique. To increase the sensitivity and selectivity of the method, mercaptobenairnidazole monomer, as the modifier was used. It was loaded at the silica nanoparticles surface by a simple chemical method. Using the synthetic nano composite in the electrode. due to a specific interaction with melamine. a decrease in anodic current of ferricyanide in the presence of the target molecule was seen. Also affecting factors in measuring of melamine including the percent modifier. pH. deposition potential and time were optimized. With dtis electrode, a linear range of 2lI}.{l to llltllltl and a
|