Rapid and non-destructive spatially offset Raman spectroscopic analysis of packaged margarines and fat-spread products
Metadatos
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Elsevier
Materia
Spatially offset Raman spectroscopy (SORS) Non-destructive analytical techniques Chemometrics and data mining In-pack measurement Food quality and authenticity Margarines and fat-spreads
Date
2022-03-17Referencia bibliográfica
Ana M. Jiménez-Carvelo... [et al.]. Rapid and non-destructive spatially offset Raman spectroscopic analysis of packaged margarines and fat-spread products, Microchemical Journal, Volume 178, 2022, 107378, ISSN 0026-265X, [https://doi.org/10.1016/j.microc.2022.107378]
Patrocinador
University of Granada (Spain) University of Granada/CBUA; Department of Economic Transformation, Industry, Knowledge and Universities belong to Regional Andalusia Government (Spain) DOC_00121; Spanish Government FPU20/04711Résumé
Spatially offset Raman spectroscopy (SORS) is a novel technique capable of measuring samples through the
original packaging and recovering the spectra without the contribution of surface layers. Here, a portable SORS
equipment was used to measure 62 samples of margarines and fat spreads through the original plastic container.
Chemometric tools were used to analyse the data obtained. A total of 25 classification models were developed
based on: (i) geographical origin, (ii) vegetable oils and (iii) some significant minor constituents present in the
samples. Partial least squares-discriminant analysis (PLS-DA), support vector machine (SVM) and soft independent
modelling of class analogy (SIMCA) were used for model classification. Quantitative analysis using the
partial least squares regression (PLSR) method was also performed to determine the total fat content. In parallel,
a benchtop conventional Raman spectrometer was used to analyse the same samples, develop the models with
the same training and validation sets in order to compare the results. The calculated classification performance
metrics showed better classification models from SORS data than conventional Raman spectroscopy (CRS),
highlighting the one-class SIMCA models for margarines containing phytosterols, olive oil or linseed oil. These
models exhibited very high predictability (performance parameters with values equal to or higuer than 0.8, 0.9
and 1, respectively). The quantitation model developed from SORS exhibited a higher R2 than from CRS data,
and prediction errors below 5% from SORS versus errors between 5 and 13% from CRS data.
These results reveal the ability of SORS to avoid the influence of fluorescence, a major drawback when
analysing Raman spectra, but also the potential of the technique as a fast, non-destructive and non-invasive
analytical technique in the field of food analysis. In conclusion, the tandem ’SORS-chemometrics’ has been
shown to be a potential tool in the food quality and food authentication fields. Thus, it is necessary to perform
further investigations in this field in order to advance the knowledge of this technique and to be able to develop
new methods of rapid analysis.