Direct analysis of calcium in liquid infant formula via laser-induced breakdown spectroscopy (LIBS)

Xavier Cama-Moncunill, Maria Markiewicz-Keszycka, Patrick J. Cullen, Carl Sullivan, Maria P. Casado-Gavalda

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The present work illustrates the potential of laser-induced breakdown spectroscopy (LIBS) for the direct analysis of liquid food products. The aim of the experiment was to predict calcium content in ready-to-feed infant formula. The analysis was performed by a LIBS system coupled to a liquid sample chamber with a rotatory wheel that presents the liquid to the laser beam as a thin film. Multivariate analysis with partial least squares regression (PLSR) was performed to correlate LIBS spectral data to reference calcium contents. The obtained PLSR model exhibited a good fit and linearity, as indicated by the coefficients of determination for calibration (Rc 2) and cross-validation (Rcv 2), with values of 0.96 and 0.89, respectively. The robustness of the calibration model was assessed by external validation showing a root-mean-square error of prediction of 6.45 mg 100 mL−1. These results demonstrated the potential of LIBS for real-time analysis of liquid food products.

Original languageEnglish
Article number125754
JournalFood Chemistry
Volume309
DOIs
Publication statusPublished - 30 Mar 2020

Keywords

  • Calcium
  • LIBS
  • Liquid analysis
  • PLSR
  • Ready-to-feed infant formula

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