Attenuated Total Reflectance-Fourier transform infrared spectroscopy coupled with chemometrics for the rapid detection of coconut water adulteration.

Autor: Teklemariam TA; Canadian Food Inspection Agency (CFIA), Greater Toronto Area Laboratory, Midland Avenue M1P 4R7, Toronto, ON, Canada. Electronic address: thomas.teklemariam@canada.ca., Moisey J; Canadian Food Inspection Agency CFIA, National Headquarter, 1400 Merivale Road, Ottawa, Ontario K1A 0Y9, Canada., Gotera J; Canadian Food Inspection Agency (CFIA), Greater Toronto Area Laboratory, Midland Avenue M1P 4R7, Toronto, ON, Canada.
Jazyk: angličtina
Zdroj: Food chemistry [Food Chem] 2021 Sep 01; Vol. 355, pp. 129616. Date of Electronic Publication: 2021 Mar 19.
DOI: 10.1016/j.foodchem.2021.129616
Abstrakt: Attenuated Total Reflectance-Fourier Transform Infrared spectroscopy (ATR-FTIR), in combination with chemometrics, was explored as a rapid method of detecting sugar adulteration in coconut water. In a simulated experiment, coconut water was substituted with binary sugars, mixed sugars, and high fructose corn syrup and discriminated using the fingerprint infrared band region between 1200 and 950 cm -1 . Principal component analysis (PCA) performed on data pre-processed by the Savitzky-Golay smoothing and gap-segment derivative, revealed data clusters discernible by the type and level of substituted sugars, enabling visual diagnosis of the similarity and anomalous features in the dataset. Statistical performance metrics following a cross-validated partial least square (PLS) regression indicated the prediction of adulterant sugars at single-digit percent substitutions. A parallel exploratory analysis of 31 different commercial coconut water samples showed a distinct PCA clustering for samples bearing the label "added sugar", suggesting the potential use of the methods to screening samples for undeclared sugar additions.
(Copyright © 2021. Published by Elsevier Ltd.)
Databáze: MEDLINE
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