Evaluation of a Graphite-Polyurethane Composite Electrode Modified with Copper Nanoparticles as an Amperometric Flow Detector in a Wall-Jet System for the Determination of Cysteine - Mattioli, Isabela A; Schildt, Letícia F. L; Cervini, Priscila; Saciloto, Thalita R; Cavalheiro, Eder Tadeu Gomes (Journal of the Brazilian Chemical Society, 2020)