JOURNAL ARTICLE
MULTICENTER STUDY

1H NMR-based protocol for the detection of adulterations of refined olive oil with refined hazelnut oil

Luisa Mannina, Marco D'Imperio, Donatella Capitani, Serge Rezzi, Claude Guillou, Thomas Mavromoustakos, María Dolores Molero Vilchez, Antonio Herrera Fernández, Freddy Thomas, Ramon Aparicio
Journal of Agricultural and Food Chemistry 2009 December 23, 57 (24): 11550-6
19928817
A (1)H NMR analytical protocol for the detection of refined hazelnut oils in admixtures with refined olive oils is reported according to ISO format. The main purpose of this research activity is to suggest a novel analytical methodology easily usable by operators with a basic knowledge of NMR spectroscopy. The protocol, developed on 92 oil samples of different origins within the European MEDEO project, is based on (1)H NMR measurements combined with a suitable statistical analysis. It was developed using a 600 MHz instrument and was tested by two independent laboratories on 600 MHz spectrometers, allowing detection down to 10% adulteration of olive oils with refined hazelnut oils. Finally, the potential and limitations of the protocol applied on spectrometers operating at different magnetic fields, that is, at the proton frequencies of 500 and 400 MHz, were investigated.

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