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Sampling effects on the quantification of sodium content in infant formula using laser induced breakdown spectroscopy (LIBS)

Cama-Moncunill, Xavier; Markiewicz-Keszycka, Maria; Cama-Moncunill, Raquel; Dixit, Yash; Casado-Gavalda, Maria P.; Cullen, P.J.; Sullivan, Carl

Sampling effects on the quantification of sodium content in infant formula using laser induced breakdown spectroscopy (LIBS) Thumbnail


Authors

Xavier Cama-Moncunill

Maria Markiewicz-Keszycka

Raquel Cama-Moncunill

Yash Dixit

Maria P. Casado-Gavalda

P.J. Cullen

Carl Sullivan



Abstract

Laser-induced breakdown spectroscopy (LIBS) was employed to predict the sodium content of infant formula (IF) over the range 0.5–4 mg Na g−1. Calibration models were built using partial least squares regression (PLS), correlating the LIBS spectral data with reference Na content quantified by atomic absorption spectroscopy (AAS). The main aim of this study was to demonstrate the ability of LIBS as a rapid tool for quantifying sodium in IF, but also to explore strategies concerning the acquisition and pre-processing of LIBS spectra. A range of different pre-processing techniques, measuring depths (repetition of laser shots) and accumulations were conducted and evaluated in terms of PLS performance. The best calibration model was developed using the third-layer spectra normalised by the H I 656.29 nm emission line, yielding a coefficient of determination (R2) of 0.93, and root-mean-square errors (RMSE) of 0.37 and 0.13 mg g−1 for cross-validation and validation, respectively.

Journal Article Type Article
Acceptance Date Apr 28, 2018
Online Publication Date Jun 2, 2018
Publication Date Oct 31, 2018
Deposit Date Jul 5, 2018
Publicly Available Date Jun 3, 2019
Journal International Dairy Journal
Print ISSN 0958-6946
Electronic ISSN 1879-0143
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 85
DOI https://doi.org/10.1016/j.idairyj.2018.04.014
Keywords LIBS; Infant formula; Sodium; Partial least squares regression; Sampling
Public URL https://nottingham-repository.worktribe.com/output/950721
Publisher URL https://www.sciencedirect.com/science/article/pii/S0958694618301298?via%3Dihub

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