Banca de QUALIFICAÇÃO: CAIO CEZAR VERONEZI MACEDO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAIO CEZAR VERONEZI MACEDO
DATA : 18/08/2021
HORA: 14:00
LOCAL: meet.google.com/aee-ptfj-adg
TÍTULO:

DETERMINATION OF METHANOL IN COMMERCIAL ALCOHOL GEL SANITIZERS BY NUCLEAR MAGNETIC RESONANCE

PÁGINAS: 17
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Análise de Traços e Química Ambiental
RESUMO:

Due to the current pandemic situation, the demand for hand sanitizers in public or busy places has increased. The supply of high quantities of this product can affect quality control, which requires fast and reliable analytical procedures with minimal sample preparation. The characteristics of methanol are similar to ethanol, however, its metabolites are extremely toxic, making important the determination of methanol in ethanolic matrixes. Thus, an analytical procedure was proposed for methanol determination in alcohol gel sanitizers using nuclear magnetic resonance (NMR). The method consisted on quantifying methanol in relation to ethanol through the proportions obtained from the integrals of the satellite ethanol peaks with the methanol peaks in the NMR spectra. The sample preparation was based on a dilution in deuterated solvent. After initial studies to estimate an approximate detection limit, 75 samples were collected in Santo André city originated from three different regions and local supermarkets. The purpose of this study was to evaluate the quality of this product supplied in the region in relation to the methanol content. Out of the 75 analyzed samples, three of them showed methanol content below the detection limit. For quantification of methanol in these samples, the procedure will be optimized and validated. In this way, it will be possible to quantify methanol in the samples. Samples will also be analyzed by reference procedure to assess the accuracy. The difficulties initially encountered regarding the loss of linearity of the analytical curve will be critically evaluated.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 2145401 - DIOGO LIBRANDI DA ROCHA
Membro Titular - Examinador(a) Externo ao Programa - 1909336 - ALEXANDRE ZATKOVSKIS CARVALHO
Membro Titular - Examinador(a) Externo ao Programa - 2249395 - THIAGO BRANQUINHO DE QUEIROZ
Membro Suplente - Examinador(a) Interno ao Programa - 1543683 - IVANISE GAUBEUR