Time-Domain Nuclear Magnetic Resonance (TD-NMR) and Chemometrics for Determination of Fat Content in Commercial Products of Milk Powder
| Autor: | Paloma Andrade Martins Nascimento, Paulo Lopes Barsanelli, Ana Paula Rebellato, Juliana Azevedo Lima Pallone, Luiz Alberto Colnago, Fabíola Manhas Verbi Pereira |
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| Přispěvatelé: | LUIZ ALBERTO COLNAGO, CNPDIA. |
| Rok vydání: | 2017 |
| Předmět: |
Toxic residue
Magnetic Resonance Spectroscopy Materials science Milk powder Analytical chemistry Analytical Chemistry Chemometrics 0404 agricultural biotechnology Humans Environmental Chemistry Nuclear magnetic resonance (TD-NMR) Sample preparation Least-Squares Analysis Spectroscopy Triglycerides Pharmacology Residue (complex analysis) Spectroscopy Near-Infrared Near-infrared spectroscopy Pulse sequence 04 agricultural and veterinary sciences Nuclear magnetic resonance spectroscopy 040401 food science Infant Formula Free induction decay Models Chemical Dairy Products Agronomy and Crop Science Food Science |
| Zdroj: | Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice) Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
| ISSN: | 1944-7922 1060-3271 |
| DOI: | 10.5740/jaoacint.16-0408 |
| Popis: | This study shows the use of time-domain (TD)-NMR transverse relaxation (T2) 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 T2 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 methodare 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. |
| Databáze: | OpenAIRE |
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