Electrochemical Sensitivity Improvement by the Cooperation between Pt and Ru for Total Antioxidant Evaluation in Natural Extracts oleh Gustavo Carvalho Diniz, Vinicius Tribuzi Rodrigues Pinheiro Gomes, Marcelo de Assis, Santiago José Alejandro Figueroa, Igor Ferreira Torquato, Luiz Gustavo de Freitas Borges, Hector Aguilar Vitorino, Roberto Batista de Lima, Marco Aurélio Suller Garcia, Isaíde de Araujo Rodrigues