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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Martins Nascimento, Paloma Andrade ; Barsanelli, Paulo Lopes ; Rebellato, Ana Paula ; Lima Pallone, Juliana Azevedo ; Colnago, Luiz Alberto ; Verbi Pereira, Fabiola Manhas
Total Authors: 6
Document type: Journal article
Source: JOURNAL OF AOAC INTERNATIONAL; v. 100, n. 2, p. 330-334, MAR-APR 2017.
Web of Science Citations: 2
Abstract

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)

FAPESP's process: 16/00779-6 - Direct obtaining of chemical information with commercial purposes from several solid analytical matrices using laser induced breakdown spectroscopy (LIBS) and Chemometrics
Grantee:Hideko Yamanaka
Support type: Regular Research Grants
FAPESP's process: 12/20264-0 - Productive, environmental and economic impacts of strategies supplementation in beef cattle diet under grazing heights and finishing strategies
Grantee:Ricardo Andrade Reis
Support type: Regular Research Grants