Differentiating the geographical origin of Ethiopian coffee using XRF- and ICP-based multi-element and stable isotope profiling

A - Papers appearing in refereed journals

Upadhayay, H. R., Worku, M., Latruwe, K., Taylor, A., Blake, W., Vanhaecke, F., Duchateau, L. and Boeckx, P. 2019. Differentiating the geographical origin of Ethiopian coffee using XRF- and ICP-based multi-element and stable isotope profiling. Food Chemistry. 290 (30 August), pp. 295-307.

AuthorsUpadhayay, H. R., Worku, M., Latruwe, K., Taylor, A., Blake, W., Vanhaecke, F., Duchateau, L. and Boeckx, P.
Abstract

To test the potential of different analytical tools to determine the geographical origin of Ethiopian coffee, 103 green arabica coffee samples from four coffee regions in Ethiopia were subjected to multi-elements and δ13C, δ15N and δ18O determinations. Multi-elements were determined by using inductively coupled plasma (ICP)- and X-ray fluorescence spectrometry (XRF)-based techniques, and δ13C, δ15N and δ18O were determined by using elemental analyzer-isotope ratio mass spectrometry. Using linear discriminant analysis, XRF-based multi-elements with and without δ13C appeared to be most effective in discriminating the geographical origin of coffee, giving higher classification accuracy (89 and 86%, respectively) than ICP-based multi-elements with and without stable isotopes (80%, each). These results demonstrate the potential of XRF-based multi-element profiling as a relatively fast and low-cost tool to trace the geographical origin of Ethiopian coffee. All together this study offers the proof of concept for a promising method that, upon standardization, could be used for coffee provenance authentication and fraud detection.

KeywordsEthiopia; Coffee origin; X-ray fluorescence spectrometry; Multi-elements; Stable isotope ratio
Year of Publication2019
JournalFood Chemistry
Journal citation290 (30 August), pp. 295-307
Digital Object Identifier (DOI)doi:10.1016/j.foodchem.2019.03.135
Open accessPublished as non-open access
Output statusPublished
Publication dates
Online27 Mar 2019
Publication process dates
Accepted25 Mar 2019
Copyright licensePublisher copyright
PublisherElsevier Sci Ltd
ISSN0308-8146

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