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Flow amperometric determination of carbofuran and fenobucarb
Sales, M. Goreti F.; Vaz, M. Carmo V. F.; Delerue-Matos, Cristina; Almeida, Sofia A. A.; Barroso, M. Fátima; Ferreira, Helder A. O.A simple, rapid, and precise amperometric method for quantification of N-methylcarbamate pesticides in water samples and phytopharmaceuticals is presented. Carbofuran and fenobucarb are the target analytes. The method is developed in flow conditions providing the anodic oxidation of phenolic-based compounds formed after alkaline hydrolysis. Optimization of instrumental and chemical variables is presented. Under...
Enzymatic determination of choline in milk using a FIA system with potentiometr...
Lima, J. L. F. C.; Delerue-Matos, Cristina; Vaz, M. Carmo V. F.The development of a FIA system for the determination of total choline content in several types of milk is described. The samples were submitted to hydrochloric acid digestion before injection into the system and passed through an enzymatic reactor containing choline oxidase immobilised on glass beads. This enzymatic reaction releases hydrogen peroxide which then reacts with a solution of iodide. The decrease i...
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