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Development of a graphite-polyurethane composite electrode modified with gold nanoparticles in the voltammetric determination of tryptophan

Grant number: 16/11773-9
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): August 01, 2016
Effective date (End): January 31, 2018
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
Principal Investigator:Éder Tadeu Gomes Cavalheiro
Grantee:Isabela Alteia Mattioli
Host Institution: Instituto de Química de São Carlos (IQSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil


This work proposes the development of a composite electrode based on graphite and polyurethane modified with gold nanoparticles for the determination of tryptophan in commercial and/or environmental samples. The main advantage of this electrode material is its high hydrophobicity compared to other composite materials which performance in an aqueous medium prevents swelling effects. The gold nanoparticles, in turn, have a high surface area, excellent conductivity and compatibility with biological molecules, favoring its application in the development of sensors, by the increase in the electron transfer kinetics, using less noble material.

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