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Control of ascorbic acid in fortified powdered soft drinks using near-infrared spectroscopy (NIRS) and multivariate analysis

  • Monique Carvalho de Santana
  • Marcia Miguel Castro Ferreira
  • Juliana Azevedo Lima PalloneEmail author
Original Article
  • 23 Downloads

Abstract

Powdered soft drinks (PSDs), fortified with antioxidants such as ascorbic acid (AA), are normally controlled by titration or chromatographic methods. This study evaluated the feasibility of using near-infrared spectroscopy (NIRS) and multivariate analysis to predict AA contents in PSDs as an alternative not-destructive method. The AA content of sixty-seven samples of commercial fortified grape and passion fruit PSDs was analyzed by the standard method (titration) and showed significant variance between flavors within the same brand. In addition, 75% of the samples required from 0.3 to 10.2 more cups of grape than passion fruit flavor to supply the AA Reference Nutrient Intake for children and adults. Spectral and reference data sets were split into calibration and validation sets. Partial least squares regression models were built and validated for the determination of AA in both PSDs. The model’s basic statistics for grape flavor PSDs (RMSEC = 0.49 mg g−1, Rcal2 = 0.84; RMSECV = 0.67 mg g−1, RCV2 = 0.70; RMSEP = 0.50 mg g−1, Rpred2 = 0.84), and that for passion fruit flavor PSDs (RMSEC = 0.24 mg g−1, Rcal2 = 0.95; RMSECV = 0.56 mg g−1, RCV2 = 0.76; RMSEP de 0.57 mg g−1, Rpred2 = 0.72) indicated that NIRS-PLS methodology produced reasonable results. The limits of detection and quantification obtained showed that the method is useful to detect and quantify AA in the studied samples. A new set of grape drinks was used for external prediction and the RMSEP was 0.62 mg g−1, Rpred2 was 0.72. Based on the results, NIRS–multivariate analysis proved to be useful for quality control of AA in commercialized grape and passion fruit in PSDs and a faster, objective and environmentally friendly method alternative to standard methods.

Keywords

PLS regression Food quality control Alternative green method 

Notes

Funding

CAPES (Grant Number 001) and CNPq (Grant Number 132497/2017-4).

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest.

Ethical approval

This article does not contain any studies with human participants performed by any of the authors.

Informed consent

Not applicable.

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Copyright information

© Association of Food Scientists & Technologists (India) 2019

Authors and Affiliations

  1. 1.Department of Food Science, Faculty of Food EngineeringUniversity of CampinasCampinasBrazil
  2. 2.Department of Physical Chemistry, Institute of ChemistryUniversity of CampinasCampinasBrazil

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