Banca de QUALIFICAÇÃO: WALKER DE LIMA CORDEIRO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : WALKER DE LIMA CORDEIRO
DATE: 05/04/2021
TIME: 14:00
LOCAL: Google Meet
TITLE:

DEVELOPMENT AND APPLICATION OF NANO PLATFORMS FOR DETECTION OF ASCORBIC ACID WITH 3,5 DINITROSALICYLIC ACID AS MEDIATOR

KEY WORDS:

Chemical Sensors, ascorbic acid, mediators, 3,5 dinitrosalicylic acid

PAGES: 70
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The present work describes a platform still under development for an electrochemical sensor for the detection of
ascorbic acid (AA). A glassy carbon electrode was modified with Vynyltrimethoxysylane (VTMS) and multi-walled
Carbon Nanotubes (MWCNT), iron nanoparticles (Fe3O4), silicon oxide (SiO2) and 3.5 dinitrosalicylic acid (DNS) as an electrochemical mediator for ascorbic acid, a modification that has not yet been mentioned in the literature, using DNS as a redox mediator. Due to their specific properties, iron oxide nanomaterials have been widely used in several fields to detect different analytes and can also be used as a carrier for silica (SiO2) compounds. The SiO2 / Fe3O4 nanocomposites demonstrate several properties, when used together for catalytic processes that facilitate
electrochemical detection and are widely used in biosensors. The DNS was used due to the characteristics inherent
to the nitro group, a chemical group widely used as chemical mediators because it can, from electro reduction,
generate hydroxylamine / nitrous, a nitrous group that is much more easily reduced than the nitro group. The sensor showed good electrochemical responses for ascorbic acid detection, of the first results in a 0.1 molL-1 phosphate buffer solution, at pH 7.0.

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