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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Time-Domain Nuclear Magnetic Resonance (TD-NMR) and Chemometrics for Determination of Fat Content in Commercial Products of Milk Powder

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Autor(es):
Martins Nascimento, Paloma Andrade ; Barsanelli, Paulo Lopes ; Rebellato, Ana Paula ; Lima Pallone, Juliana Azevedo ; Colnago, Luiz Alberto ; Verbi Pereira, Fabiola Manhas
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF AOAC INTERNATIONAL; v. 100, n. 2, p. 330-334, MAR-APR 2017.
Citações Web of Science: 2
Resumo

This study shows the use of time-domain (TD)-NMR transverse relaxation (T-2) data and chemometrics in the nondestructive determination of fat content for powdered food samples such as commercial dried milk products. Most proposed NMR spectroscopy methods for measuring fat content correlate free induction decay or echo intensities with the sample's mass. The need for the sample's mass limits the analytical frequency of NMR determination, because weighing the samples is an additional step in this procedure. Therefore, the method proposed here is based on a multivariate model of T-2 decay, measured with Carr-Purcell-Meiboom-Gill pulse sequence and reference values of fat content. The TD-NMR spectroscopy method shows high correlation (r = 0.95) with the lipid content, determined by the standard extraction method of Bligh and Dyer. For comparison, fat content determination was also performed using a multivariate model with near-IR (NIR) spectroscopy, which is also a nondestructive method. The advantages of the proposed TD-NMR method are that it (1) minimizes toxic residue generation, (2) performs measurements with high analytical frequency (a few seconds per analysis), and (3) does not require sample preparation (such as pelleting, needed for NIR spectroscopy analyses) or weighing the samples. (AU)

Processo FAPESP: 16/00779-6 - Obtenção direta de informações químicas de interesse comercial de matrizes analíticas sólidas diversificadas utilizando a espectroscopia de emissão com plasma induzido por laser (LIBS) e quimiometria
Beneficiário:Hideko Yamanaka
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 12/20264-0 - Impactos produtivos, ambientais e econômicos de estratégias de suplementação da dieta de bovinos de corte sob alturas de pastejo e estratégias de terminação
Beneficiário:Ricardo Andrade Reis
Linha de fomento: Auxílio à Pesquisa - Regular