Banca de DEFESA: CAIO CEZAR VERONEZI MACEDO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAIO CEZAR VERONEZI MACEDO
DATA : 07/04/2022
HORA: 14:00
LOCAL: Remoto
TÍTULO:

Evauation of quality of alcohol gel .

PÁGINAS: 58
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Analítica
ESPECIALIDADE: Métodos Óticos de Análise
RESUMO:

Quality assessment of alcohol-based sanitizers is important to ensure product efficiency and to avoid contamination. Ethanol is the main constituent of these sanitizers, which inactivates microorganisms present on surfaces, such as the virus that causes COVID-19. For the maximum efficiency, the sanitizer must
show ethanol content between 60 and 80%. Nevertheless, these products may contain toxic compounds, such as methanol, which is commonly found in samples with high ethanol content. Therefore, analytical procedures are necessary to quantify these components in sanitizers. In this work, two spectrophotometric procedures were proposed for the determination of ethanol and methanol in gel and liquid commercial sanitizers. Both procedures were based on the oxidation of analytes by KMnO4 in acidic medium. The remaining reagent was related to the ethanol concentration in the samples. For methanol determination, the yielded formaldehyde was quantified after reaction with acetylacetone in ammonium acetate medium. For ethanol determination, the detection limit (n=15, 99.7% confidence level) and the coefficient of variation (n=15) were estimated, respectively, at 24 μmol L-1 and 1.7%. The most common concomitants in the samples did not cause significant interference. Recoveries between 84 and 95% indicated minimum matrix effects. The results of analyzed samples by the proposed and the reference procedures did not show significant differences (95% confidence level). For methanol determination, the detection limit (n=10, 99.7% confidence) and coefficient of variation (n= 10) were estimated, respectively, at 18 μmol L-1 and 3.1 %. Recoveries obtained between 45 and 115% and interference studies indicated that additional evaluations are needed to improve the performance of this procedure.

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 à Instituição - SIDNEI GONCALVES DA SILVA - UFU
Membro Suplente - Examinador(a) Interno ao Programa - 1543683 - IVANISE GAUBEUR
Membro Suplente - Examinador(a) Externo à Instituição - WANESSA MELCHERT MATTOS - USP