Calibration strategies for the direct determination of Ca, K, and Mg in commercial samples of powdered milk and solid dietary supplements using laser-induced breakdown spectroscopy (LIBS)
| Autor: | Fabíola Manhas Verbi Pereira, Paulo Lopes Barsanelli, Edenir Rodrigues Pereira-Filho, Amanda dos Santos Augusto |
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| Přispěvatelé: | Universidade Federal de São Carlos (UFSCar), Universidade Estadual Paulista (Unesp) |
| Rok vydání: | 2017 |
| Předmět: |
Calibration curve
Analytical chemistry Laser-induced breakdown spectroscopy 02 engineering and technology 01 natural sciences Chemometrics Direct solid analysis Partial least squares regression Animals Humans Magnesium Least-Squares Analysis Spectroscopy Chromatography Chemistry Lasers Spectrum Analysis 010401 analytical chemistry Commerce Reproducibility of Results Dietary supplements 021001 nanoscience & nanotechnology 0104 chemical sciences Dilution Milk Inductively coupled plasma atomic emission spectroscopy Dietary Supplements Calibration Powdered milk Potassium Calcium Powders Inductively coupled plasma 0210 nano-technology Food Analysis Food Science |
| Zdroj: | Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 0963-9969 |
| DOI: | 10.1016/j.foodres.2017.01.027 |
| Popis: | Made available in DSpace on 2018-12-11T17:09:46Z (GMT). No. of bitstreams: 0 Previous issue date: 2017-04-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) This study describes the application of laser-induced breakdown spectroscopy (LIBS) for the direct determination of Ca, K and Mg in powdered milk and solid dietary supplements. The following two calibration strategies were applied: (i) use of the samples to calculate calibration models (milk) and (ii) use of sample mixtures (supplements) to obtain a calibration curve. In both cases, reference values obtained from inductively coupled plasma optical emission spectroscopy (ICP OES) after acid digestion were used. The emission line selection from LIBS spectra was accomplished by analysing the regression coefficients of partial least squares (PLS) regression models, and wavelengths of 534.947, 766.490 and 285.213 nm were chosen for Ca, K and Mg, respectively. In the case of the determination of Ca in supplements, it was necessary to perform a dilution (10-fold) of the standards and samples to minimize matrix interference. The average accuracy for powdered milk ranged from 60% to 168% for Ca, 77% to 152% for K and 76% to 131% for Mg. In the case of dietary supplements, standard error of prediction (SEP) varied from 295 (Mg) to 3782 mg kg− 1 (Ca). The proposed method presented an analytical frequency of around 60 samples per hour and the step of sample manipulation was drastically reduced, with no generation of toxic chemical residues. Group for Applied Instrumental Analysis Department of Chemistry Federal University of São Carlos, Rod. Washington Luís, km 235 Department of Analytical Chemistry Institute of Chemistry São Paulo State University (Unesp), Rua Professor Francisco Degni, 55 Department of Analytical Chemistry Institute of Chemistry São Paulo State University (Unesp), Rua Professor Francisco Degni, 55 FAPESP: 2016/00779-6 CNPq: 305637/2015-0 CNPq: 401074/2014-5 CNPq: 445729/2014-7 |
| Databáze: | OpenAIRE |
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