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1.
Food Chem ; 365: 130477, 2021 Dec 15.
Artigo em Inglês | MEDLINE | ID: mdl-34237570

RESUMO

The contamination of milk by antibiotic residues is a worldwide health and food safety problem. There is a need to develop new methods for the rapid determination of antibiotic residues in milk. A method has been developed for determining tylosin residues directly in powdered milk using Fourier Transformed Infrared spectroscopy (FTIR). Tylosin is a broad-spectrum macrolide antibiotic. The spectra obtained were submitted to chemometric analysis to obtain a prediction model for tylosin concentration in powdered milk. Using the Boruta algorithm, the absorption bands related to the milk contamination by the antibiotic were identified. Random forest was shown to be adequate for the prediction of tylosin residues in milk at low concentrations (≤ 100 µg L-1) and the prediction model generated showed high correlation and determination coefficients (greater than 0.95). The proposed methodology proved to be efficient for the investigation of antibiotic residues in powdered milk.


Assuntos
Leite , Tilosina , Animais , Antibacterianos/análise , Leite/química , Pós , Espectrofotometria Infravermelho , Espectroscopia de Infravermelho com Transformada de Fourier , Tilosina/análise
2.
Food Chem ; 318: 126473, 2020 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-32143131

RESUMO

In this work is presented the development of a method for As and Se determination in crude palm oil samples by hydride generation atomic fluorescence spectrometry and Hg by cold vapor atomic fluorescence spectrometry after ultrasound-assisted emulsification and extraction induced by emulsion breaking (EIEB). The optimization of the method was carried out by multivariate designs. The developed method has presented limits of quantification (LOQ) of 0.72, 0.12, and 1.5 µg L-1 for As, Hg, and Se, respectively. The precisions of the proposed method expressed as repeatability were 0.92, 2.2, and 3.7% RSD for 2 µg L-1 (n = 10) of As, Hg and Se, respectively. The developed methodology was applied in palm oil samples collected in the Bahia State. Concentrations (µg L-1) found in the samples were between

Assuntos
Arsênio/análise , Emulsões/química , Análise de Alimentos/métodos , Mercúrio/análise , Óleo de Palmeira/análise , Selênio/análise , Fracionamento Químico/métodos , Análise de Alimentos/estatística & dados numéricos , Contaminação de Alimentos , Gases/química , Limite de Detecção , Análise Multivariada , Óleo de Palmeira/química , Espectrometria de Fluorescência/métodos , Espectrofotometria Atômica/métodos
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